Month: December 2022

v. Braun, Julius published the artcileThe reaction of aldehydes with metals and their catalytic pressure hydrogenation, Category: catalysis-chemistry, the publication is Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen (1934), 1696-712, database is CAplus.

On hydrogenation under pressure at high temperatures with Ni, nonaromatic aldehydes give, along with the expected primary alcs., considerable quantities of unsaturated OH compounds with double the number of C atoms, e. g., C₁₄H₂₉OH from enanthal, C₇H₁₄O (C. A. 18, 814). On the assumption that they are straight-chain compounds (Me(CH₂)₆CH(OH)(CH₂)₅Me from enanthal), it seemed that they might be formed according to 1 of the 2 following schemes (it was shown that they are not produced through a glycol RCH(OH)CH(OH)R formed primarily): RCH₂CHO + OHCCH₂R ¡ú RCH₂CH(OH)COCH₂R (I) ¡ú RCH:CHCOCH₂R (II) ¡ú RCH₂CH₂CH(OH)CH₂R (III), or RCH₂CHO + OHCCH₂R ¡ú RCH:CHOH + OHCCH₂R ¡ú II ¡ú III. The first of these 2 possibilities, which seemed the more probable, is excluded by the fact that campholic and fencholic aldehydes, in which the CHO group is on a tertiary C atom, react exclusively like aromatic aldehydes with formation of the corresponding primary alcs. The 2nd possibility was also excluded by experiments made with special care on decylic aldehyde (IV). With Ni and H, IV gives, besides decyl alc., an alc. C₂₀H₄₁OH (V) which cannot be converted into crystalline eicosane; V or its bromide gives only an isomeric liquid eicosane (VI) and therefore the chain in V must be branched. The nature of the branching was shown by degradation experiments; the hydrogenation product of PrCHO gave pure BuCOEt, that of iso-BuCHO yielded iso-AmCOCHMe₂, and that of enanthal formed C₇H₁₅COAm. The primary stage in the reduction of the aldehydes RCH₂CHO must therefore be not RCH:CHOH but the aldol RCH₂CH(OH)CHRCHO or the unsaturated aldehyde RCH₂CH:CRCHO (VII). These aliphatic aldehydes RCH₂CHO heated under N in steel autoclaves change rapidly, first into VI, and then into much higher boiling isomers with triple the mol. weight which, however, are not paraldehydes but the glycol esters, RCH₂(OH)CHRCH₂OCOCH₂R (cf. Neust?dter, Monatsh. 27, 903(1906), and earlier papers by pupils of Lieben). The structure of these glycol esters has been confirmed by oxidation to the keto esters RCH₂COCHRCH₂OCOCH₂R, and by dehydration to the unsaturated esters RCH₂CH:CRCH₂OCOCH₂R which, after saponification, yield the unsaturated primary alcs. RCH₂CH:CRCH₂OH and then the saturated primary alcs. The change undergone by aldehydes heated in steel autoclaves is not a reaction of the aldehydes alone; the material of the autoclave plays a role. A considerable amount of metal powder (chiefly Cu, from the gaskets) was always formed; moreover, even at room temperature in the absence of air and moisture, aldehydes react distinctly with finely divided metals (Cu, Fe, Co, Ni, Cr, Zn, Mn) with primary evolution of H. In a short time colored solutions are formed, a flocculent metallic hydroxide gradually precipitates out, then a separation of water is observed, and after long standing VII and the glycol ester can be isolated as in the autoclave experiments, although the yields of glycol ester are much smaller. Presumably a metal enolate RCH:CHOM is first formed which yields with comparative ease the aldol RCH₂CH(OM)CHRCHO and the latter changes, much less readily, through RCH₂CH((CHRCHO)OCH((OM)CH₂R and and through RCH₂CH(CHRCHO)OCH(OM)CH₂R and to RCH₂CH(OM)CHRCH₂OCOCH₂R. In the cold, the aldol has time to change chiefly into the unsaturated aldehyde and metal hydroxide, whereas on heating the change into glycol predominates. Different metals vary distinctly in their influence on the reaction, but no relation between their influence and their properties (e. g., their position in the tension series) has as yet been established. All the experiments with metals at room temperature were made in Jena glass, so the alkalinity of the glass played no part. ¦Â-Decyl-¦Â-octylethyl alc. (V) b₁₇ 230¡ã; bromide, b_0.4 195¡ã, reacts quite readily with Mg in ether, yielding asym-decyloctylethane (VI), b₁₄ 200¡ã, also obtained by catalytic hydrogenation with Pd and H of the ethylene, b₁₂ 193-5¡ã, d₄^22.5 0.8102, which is best prepared by boiling the bromide with 2-3 mols. aqueous alc. KOH until free from halogen, precipitating with water and boiling 10-12 hrs. with 60% H₂SO₄. ¦Â-Butyl-¦Â-ethylethyl alc., from PrCHO, b₁₅ 84-6¡ã, d₄²⁰ 0.8381, n_D 1.4335; bromide, b₁₅ 73-6¡ã, forms with NMe₃ in benzene at 100¡ã the quaternary bromide BuEt-CHCH₂NMe₃Br, which m. above 200¡ã and yields on treatment with Ag₂O and distillation with alkali the tertiary dimethylamine, b. 177-9¡ã (methiodide, m. 215¡ã), and asymbutylethylethylene, b. 116-18¡ã. The latter on ozonization gives BuCOEt. Heated 3 hrs. under N at 300¡ã in a steel autoclave, PrCHO gives 25% unchanged PrCHO, 50% ¦Áethyl-¦Â-propylacrolein, b. 172¡ã, and 15% of the glycol ester, C₁₂H₂₄O₃, b₁₀ 148-50¡ã, saponified to PrCO₂H and the glycol, C₈H₁₈O₂, b₁₂ 131-3¡ã, d₄²² 0.9789, n_D¹² 1.4537. With 1 mol. PrCOCl in pyridine, the glycol regenerates the above ester and with 2 mols. chloride forms the dibutyrate, b₁₂ 154-8¡ã. The dichloride and dibromide, b_0.2 50¡ã and 82¡ã, resp., from the glycol with concentrated HCl and HBr at 120¡ã, are unstable and lose considerable halogen acid when distilled in the vacuum of a water pump. The structure of the acrolein was established by hydrogenation with Pd and H and conversion of the oxime, C₈H₁₇ON, b₁₀ 104-6¡ã, of the product with PCl₅ into the nitrile, b₁₀ 75¡ã, of BuEtCHCO₂H. The glycol treated in a current of H with Beckmann’s mixture (2 atoms O) gives about 50% of a compound C₈H₁₄O₂, b₁₂ 100-3¡ã (presumably chiefly the HO aldehyde PrCH(OH)CHEtCHO; oxime, b. 140-5¡ã), and the yellow diketone PrCOCOEt, b. 147-9¡ã. The latter is also formed, in very small amount, with the keto ester, PrCOCHEtCH₂OCOPr, b. 130-4¡ã, from the glycol ester with CrO₃AcOEt. The glycol ester is best dehydrated with PCl₃ in CH₂Cl₂; the resulting ¦Á-ethyl-¦Â-propylallyl alc. (65-70% yield), b₁₂ 68-71¡ã, d₄²² 0.8414, n_D 1.4418; acetate, b. 79-81¡ã; bromide, b₁₂ 68-70¡ã, splits off HBr with cold water, forms with NMe₃ a quaternary bromide, m. 175¡ã, and yields with NH₄SCN the mustard oil, C₈H₁₅NCS, b. 105-10¡ã. The yield of glycol ester is not increased by adding the unsaturated aldehyde to the PrCHO before heating in the autoclave; the acrolein is therefore not an intermediate stage in the production of the glycol ester. That the acrolein is formed by direct dehydration of 2 mols. PrCHO is confirmed by the behavior of the PrCHO in the presence of BzH; heating after addition of BzH gives ¦Á-ethylcinnamaldehyde, b₁₀ 126-8¡ã, d₄²² 1.0201, n_D¹⁶ 1.5847, which is reduced by Pd and H to ¦Â-ethyl-¦Â-benzylethyl alc., b₁₀ 126-8¡ã. ¦Â-Heptyl-¦Â-amylethyl alc., from enanthal, forms a bromide, b₁₁, 154-6¡ã; the quaternary bromide obtained with NMe₃ and the quaternary chloride are soluble in ether, and evaporation of the C₆H₆-Et₂O solutions leaves viscous residues, but the chloroplatinate, C₃₄H₇₆N₂Cl₈Pt, seps. in golden yellow leaflets decomposing 218¡ã. The tertiary amine, Am(C₇H₁₅)CHCH₂NMe₂, b₁₁ 143-5¡ã, and the ethylene, Am(C₇H₁₅)C:CH₂, b₁₁ 117-18¡ã, d₄^22.5 0.7728, n_D 1.4374; the latter on ozonization gives heptyl Am ketone, b₁₁ 128-9¡ã, m. 18.5¡ã, d₄²⁵ 0.8244, n_D 1.4320. The glycol ester, C₂₁H₄₂O₃, from enanthal, b_0.3 176-8¡ã, d₄¹⁷ 0.9012, n_D 1.4554, is saponified by alkali to enanthic acid and the glycol, C₆H₁₃CH(OH)CHAmCH₂OH, which distils under 12 mm. as a thick liquid; the diketone, b₁₂ 110¡ã, has not yet been obtained in entirely pure form. 2-Isopropyl-5-methylhexanol, from iso-BuCHO, b₁₁ 92-5¡ã; bromide, b₁₁ 92-5¡ã; trimethylammonium bromide, m. 152¡ã; dimethylamine, b. 196-8¡ã (methiodide, m. 132¡ã); asym-isoamylisopropylethylene, b. 150¡ã, d₄²⁴ 0.7387, n_D²⁴ 1.4202; iso-Am iso-Pr ketone, b₁₀ 58¡ã, d₄²⁵ 0.8135, n_D 1.4147; glycol ester, iso-BuCH(OH)CH(CHMe₂)CH₂OCOCH₂CHMe₂, b₁₂ 150-8¡ã (Rosiner, Monatsh. 22, 545(1901)), dehydrated by PCl₃ and saponified with alkali, gives enanthic acid and ¦Á-isopropyl-¦Â-isobutylallyl alc., b₁₂ 80-5¡ã, d₄²⁰ 0.8375, n_D 1.4485.

Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen published new progress about 28056-87-3. 28056-87-3 belongs to catalysis-chemistry, auxiliary class Amine,Aliphatic hydrocarbon chain, name is 2-Ethyl-N,N-dimethylhexan-1-amine, and the molecular formula is C7H13NO2, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Babu, B. Suresh published the artcileKinetic and mechanistic studies of cerium(III)- catalysed oxidation of 4-oxo acids by bromate in acid medium: nonlinear Hammett plots, Name: 3-Benzoylpropionicacid, the publication is Current Science (2021), 121(5), 651-659, database is CAplus.

The kinetic and mechanistic aspects of cerium(III)- catalyzed oxidation of 4-oxo acids by bromate (uncon taminated with bromine) in an acid medium have been studied. The reaction exhibited first-order each in [bromate] and [acid], fractional order each in [oxo acid] and [cerium(III)], and also showed solvent isotope effect of 0.55 (k(H₂O)/ k (D₂O)). The reaction did not induce polymerization and the induction period was not observed The influence of ionic strength on the rate was negligible, while increase in reaction rate was found by lowering the dielec. constant of the me dium. The reaction rate was affected by the presence of substituents in the reaction center. Increase in the reaction rate by electron releasing substituents and decrease in the rate by the presence of electron-with drawing substituents were observed The Hammett plots were characterized by smooth curvature; how ever, linearity was observed using exalted ¦Ò values. A neg. value for the reaction constant was observed The isokinetic relationship was evaluated from the Arrhenius and Hammett plots. The formation of a ternary complex between oxidant, substrate and catalyst has been proposed in the mechanism. Based on the proposed mechanism, the rate law has been deri ved. The formation of a ¦Ð-complex between Ce(III) and -ene of the enol form of oxo acid has been pro posed. This reaction finds application in the synthesis of substituted benzoic acids and involves the pheno mena of intramol. catalysis and neighboring group participation.

Current Science published new progress about 2051-95-8. 2051-95-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ketone, name is 3-Benzoylpropionicacid, and the molecular formula is C10H10O3, Name: 3-Benzoylpropionicacid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Kumar, Tarun published the artcileSynthesis of Aminophenanthrenes and Benzoquinolines via Hauser-Kraus Annulation of Sulfonyl Phthalide with Rauhut-Currier Adducts of Nitroalkenes, Formula: C10H11NO4, the publication is Organic Letters (2017), 19(16), 4283-4286, database is CAplus and MEDLINE.

The Hauser-Kraus reaction of sulfonyl phthalide with nitroalkene derivatives provides access to aminophenanthrenes, including phenanthrene-substituted amino acids and benzoquinolines. The intermediate quinones bearing a key ketoalkyl moiety undergoes facile intramol. enamine cyclization. Interestingly, enamines derived from primary and secondary amines undergo cyclization via C-centered nucleophilic attack to provide aminophenanthrenes I [R¹R² = (CH₂)₄, (CH₂)₂O(CH₂)₂, etc.; Ar = 4-FC₆H₄, 3-MeOC₆H₄, etc.] whereas those derived from ammonia undergo cyclization via N-centered nucleophilic attack leading to benzoquinolines II (Ar = 4-FC₆H₄, 4-MeOC₆H₄, Ph, etc.). A one-pot protocol for the direct transformation of phthalides and nitroalkene derivatives to aminophenanthrenes and benzoquinolines has also been developed.

Organic Letters published new progress about 4230-93-7. 4230-93-7 belongs to catalysis-chemistry, auxiliary class Alkenyl,Nitro Compound,Benzene,Ether, name is 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, and the molecular formula is C10H11NO4, Formula: C10H11NO4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Xue, Yulan published the artcileSeparation of aluminum hydroxide and gypsum by flotation during wastewater treatment, Quality Control of 2016-56-0, the publication is Zhongnan Kuangye Xueyuan Xuebao (1983), 21-8, database is CAplus.

An artificial acid mine water containing 500 mg Al/L and 600 mg SO₄^2-/L was neutralized by CaCO₃; the products were treated by flotation separation for gypsum removal using dodecylammonium?acetate (DAA) [2016-56-0] as a collector and starch as a depressor for Al(OH)₃ settling. Acid mine water from Matsuo is so treated with 97% recovery for gypsum and 96% for Al(OH)₃.

Zhongnan Kuangye Xueyuan Xuebao published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is 0, Quality Control of 2016-56-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Hajipour, Abdol R. published the artcileMagnetic chitosan-functionalized cobalt-NHC: Synthesis, characterization and catalytic activity toward Suzuki and Sonogashira cross-coupling reactions of aryl chlorides, Recommanded Product: 4,4′-Dimethyldiphenyl, the publication is Molecular Catalysis (2021), 111573, database is CAplus.

A Cobalt-NHC (N-Heterocyclic carbene) complex is anchored on magnetic chitosan nanoparticles and is assayed its catalytic activity for the reactions of substituted phenylboronic acid 4-RC₆H₄B(OH)₂ (R = Me, OMe, C(O)CH₃) and also phenlacetylene R¹C₆H₄CCH (R¹ = 2-Me, 3-Me, 4-Me, 4-OMe) with derivatives of aryl chlorides R²Cl (R² = 3-methylphenyl, 4-nitrophenyl, pyridin-4-yl, pyridin-2-yl, etc.) were prepared These reactions are of great importance since they are employed for the synthesis of unsym. diarylethynes RCCC₆H₄4-R¹ and biphenyls R²C₆H₄4-R, which belong to a prime class of building blocks. The synthesized nanocatalyst was found to be highly efficient in Suzuki and Sonogashira coupling in terms of their activity and recyclability in polyethylene glycol (PEG) as a green reaction media under conditions of temperatures (70 and 100¡ãC) and Co loading (3 and 6 mol%). To the best of knowledge, this is the first attempt of using cobalt-NHC complex for catalyzing the abovementioned reactions. Moreover, replacing the earth-abundant Cobalt-based catalyst as an alternative to high cost palladium make this approach promising from sustainable chem. view.

Molecular Catalysis published new progress about 613-33-2. 613-33-2 belongs to catalysis-chemistry, auxiliary class Benzene, name is 4,4′-Dimethyldiphenyl, and the molecular formula is C14H14, Recommanded Product: 4,4′-Dimethyldiphenyl.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Gushchin, A. V. published the artcileSynthesis of Ph₃Bi(O₂CR)₂ Compounds with Unsaturated Carboxylic Acids and Use of Triphenylbismuth Dicrotonate in the Synthesis of Bismuth-Containing Polymers, Related Products of catalysis-chemistry, the publication is Russian Journal of General Chemistry (2022), 92(1), 85-94, database is CAplus.

Triphenylbismuth dicarboxylates Ph₃Bi(O₂CCH:CHMe)₂, Ph₃Bi(O₂CCH:CHPh)₂, Ph₃Bi(O₂CCH:CHC₆H₄NO₂-m)₂, Ph₃Bi(O₂CCH:CHC₄H₃O)₂, Ph₃Bi(O₂CCH:CHC₆H₄OMe-p)₂, Ph₃Bi(O₂CCH:CHCH:CHMe)₂, Ph₃Bi(O₂CCH₂CH:CH₂)₂ were obtained by the reaction of triphenylbismuth with ^tBuOOH and unsaturated carboxylic acids in yields of 43-90%. According to the X-ray data for Ph₃Bi(O₂CCH:CHMe)₂, Ph₃Bi(O₂CCH:CHPh)₂, Ph₃Bi(O₂CCH:CHC₆H₄NO₂-m)₂, and Ph₃Bi(O₂CCH:CHC₄H₃O)₂, the coordination of the bismuth atom is intermediate between trigonal bipyramidal and tetragonal pyramidal. Close intermol. contacts (3.648 ?) in the triphenylbismuth dicrotonate crystal, involving the C:C bonds of the crotonate fragments were revealed. Triphenylbismuth dicrotonate was used to synthesize transparent bismuth-containing poly(Me methacrylate) and polystyrene (1-5%). The mol. weight and X-ray and UV absorption characteristics of the polymers were determined

Russian Journal of General Chemistry published new progress about 1772-76-5. 1772-76-5 belongs to catalysis-chemistry, auxiliary class Benzenes, name is (E)-3-(3-Nitrophenyl)acrylic acid, and the molecular formula is C9H7NO4, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Holmes, Michael E. published the artcileControlling the anisotropy of holographic polymer-dispersed liquid-crystal gratings, Related Products of catalysis-chemistry, the publication is Physical Review E: Statistical, Nonlinear, and Soft Matter Physics (2002), 65(6-2), 066603/1-066603/4, database is CAplus and MEDLINE.

In this work the optical properties of elec. switched transmission gratings fabricated holog. using polymer-dispersed liquid-crystal (PDLC) materials were investigated. It was found that the PDLC mixture can be used to control the diffractive properties of the liquid-crystal composite gratings. In one limit the gratings are highly isotropic and in the other limit the gratings are highly anisotropic with a large birefringence. The exptl. results are compared to theories that include the birefringence of the grating. From theor. fits to the exptl. data, measurements of the liquid-crystal distribution and alignment are obtained.

Physical Review E: Statistical, Nonlinear, and Soft Matter Physics published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Di Mauro, Chiara published the artcileRecyclable, Repairable, and Reshapable (3R) Thermoset Materials with Shape Memory Properties from Bio-Based Epoxidized Vegetable Oils, Application In Synthesis of 119-80-2, the publication is ACS Applied Bio Materials (2020), 3(11), 8094-8104, database is CAplus and MEDLINE.

The preparation of thermosets based on epoxidized vegetable oils (EVOs) involved a peculiar attention in recent years; however, most of them cannot be recycled once crosslinked. In the present work, epoxy thermosetting resins like-vitrimers with dynamic disulfide covalent bonds were prepared by copolymerizing twelve EVOs with 2,2′-dithiodibenzoic acid, as hardener. Here, we show for the first time the reprocessability, repairability, and recyclability properties of EVOs thermosets. The 3R abilities were evaluated in correlation with the EVO epoxy contents, which influence the final thermo-mech. properties of the recycled material. The virgin vs. recycled materials’ comparison was studied by FT-IR, DSC, TGA, and DMA, also comparing their swelling ability and high gel content. The study investigates, in addition, the excellent shape memory properties of the reprocessed EVOs/disulfide materials.

ACS Applied Bio Materials published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Application In Synthesis of 119-80-2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Di Mauro, Chiara published the artcileSustainable Series of New Epoxidized Vegetable Oil-Based Thermosets with Chemical Recycling Properties, Computed Properties of 119-80-2, the publication is Biomacromolecules (2020), 21(9), 3923-3935, database is CAplus and MEDLINE.

This work reports for the first time the copolymerization studies of 11 newly synthesized epoxidized vegetable oils (EVOs) that reacted with a disulfide-based aromatic dicarboxylic acid (DCA) to produce thermoset materials with recyclability properties. These new EVOs’ reactivity and properties were compared with those of the two com. references: epoxidized linseed oil (ELO) and epoxidized soybean oil (ESO). The structure-reactivity correlation is proposed by differential scanning calorimetry (DSC) anal., corroborating the epoxy content of EVO monomers, the initiator effect, the copolymerization reaction enthalpy, and the temperature range. The thermomech. properties of the obtained thermosets were evaluated and discussed in correlation with the structure and reactivity of monomers by dynamic mech. anal. (DMA), tensile testing, and thermogravimetric anal. (TGA). It has been found that the higher the EVO functionality, the higher is the reactivity, crosslinking d., and final performances, with tan ¦Ä values ranging from 34 to 111¡ãC. This study investigates the chem. recycling and the solvent resistance of these vitrimer-like materials that have a high bio-based carbon content, from 58 to 79%, with potential application in coating or composite materials in the automotive sector.

Biomacromolecules published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Computed Properties of 119-80-2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Ueda, Atsushi published the artcileE-Selective ring-closing metathesis in ¦Á-helical stapled peptides using carbocyclic ¦Á,¦Á-disubstituted ¦Á-amino acids, Related Products of catalysis-chemistry, the publication is Organic Letters (2022), 24(4), 1049-1054, database is CAplus and MEDLINE.

We present an E-selective ring-closing metathesis reaction in ¦Á-helical stapled peptides at positions i and i + 4. The use of two chiral carbocyclic ¦Á,¦Á-disubstituted ¦Á-amino acids, (1S,3S)-Ac₅c^3OAll and (1R,3S)-Ac₅c^3OAll, provides a high E-selectivity of a ¡Ü59:1 E:Z ratio, while mixtures with E:Z ratios of 2.1-0.5:1 were produced with standard acyclic (S)-(4-pentenyl)alanine amino acids. A stapled octapeptide composed of (1S,3S)- and (1R,3S)-Ac₅c^3OAll amino acids showed a right-handed ¦Á-helical crystal structure.

Organic Letters published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C3H5BN2O2, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia