Tag: M.W=200-250

Mahanthappa, Mahesh K. published the artcileSynthesis, Structure, and Ethylene/¦Á-Olefin Polymerization Behavior of (Cyclopentadienyl)(nitroxide)titanium Complexes, Product Details of C14H23N, the publication is Organometallics (2004), 23(4), 836-845, database is CAplus.

Mono-Cp titanium coordination compounds bearing monoanionic ligands derived from stable nitroxyl radicals have been synthesized by two methods: (i) trapping of CpTi(III) species with the stable nitroxyl radical TEMPO (2,2,6,6-tetramethylpiperidine-N-oxyl) to provide Cp’TiCl₂(TEMPO) (Cp’ = Cp (1) and Cp^* (2)) and (ii) salt metathesis of Ti(IV) halides with a nitroxide anion generated by the in situ methylation of tert-butyl-¦Á-phenylnitrone. Alkylation of these complexes with MeLi or MeMgBr furnishes Cp^*TiMe₂(TEMPO) (3) and Cp’TiMe₂(ON(^tBu)(CHMePh)) (Cp’ = Cp (4) and Cp^* (5)). The mol. structure of 2 has been determined by x-ray crystallog. to reveal a monoanionic ¦Ç¹-TEMPO ligated to titanium. Complexes 3 and 4 activated with ^iprAFPB (2,6,-diisopropyl-N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate) efficiently copolymerize ethylene and 1-hexene to provide copolymers having higher 1-hexene contents and higher productivities than the related Cp^*Ti(CH₂Ph)₃ under identical conditions. Comparison of structural and electronic features as well as the ethylene/1-hexene copolymerization behavior of 3 and 4 with the constrained geometry catalyst [MeSi₂(¦Ç⁵-Me₄Cp)(¦Ç¹-N-tBu)]TiMe₂ provides insights into factors governing high comonomer incorporation by mono-Cp titanium complexes.

Organometallics 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, Product Details of C14H23N.

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

Dallemer, F. published the artcileSynthesis of tertiary phosphine oxides mediated by SmCp₂ or SmI₂, Formula: C15H15OP, the publication is Applied Organometallic Chemistry (1995), 9(5 & 6), 431-5, database is CAplus.

Tertiary phosphine oxides are prepared under mild conditions by sequential addition of diphenylphosphinoyl chloride to divalent samarium compounds (SmCp₂ and SmI₂) followed by reaction with various electrophiles such as organic halides, tosylates, epoxides or ¦Á,¦Â-unsaturated ketones. Biscyclopentadienylsamarium (SmCp₂) gives better yields than SmI₂. Similar reactions, using phenylphosphonoyl dichloride, SmI₂ and subsequent addition of two equivalent of activated halides, yield the corresponding tertiary phosphine oxides.

Applied Organometallic Chemistry published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Formula: C15H15OP.

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

Armstrong, Susan K. published the artcileA new method for stereoselective homoallylic amine synthesis, Recommanded Product: Allyldiphenylphosphine oxide, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1993), 1433-47, database is CAplus.

Nitrile oxide cycloadditions to readily available allylic diphenylphosphine oxides [Ph₂P(O)CHR¹CH:CH₂; R¹ = H, Me, Et, Pr, isobutyl] proceeded regioselectively and stereoselectively to give 5-(1′-diphenylphosphinoyalkyl)isoxazolines [I and II; R¹ as above, R² = Et, Pr, hexyl, Ph, Me, CO₂Et,(CH₂)_nCO₂Me, n = 2,3]. These heterocycles were reduced to ¦Ä-amino-¦Â-hydroxyalkyldiphenylphosphine oxides (III and IV; R¹, R² as above) using a combination of sodium borohydride and nickel(II) chloride. Stereospecific elimination of diphenylphosphinic acid from the reduction products using sodium hydride in N,N-dimethylformamide gave homoallylic primary amines (V and VI; R¹, R² as above) of defined stereochem.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Recommanded Product: Allyldiphenylphosphine oxide.

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

Armstrong, Susan K. published the artcileOn the stereoselectivity of nitrone addition to ¦Á-diphenylphosphinoylalkenes, Name: Allyldiphenylphosphine oxide, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1994), 2825-31, database is CAplus.

The title reaction was studied for both achiral and ¦Á-chiral alkenes and for cyclic and acyclic nitrones, e.g., I. In each case, addition to allyldiphenylphosphine oxide 1 gave a single isoxazolidine product, e.g., II. The configurations of these isoxazolidines were studied by NMR methods, and are consistent with reaction via exo transition states. Nitrone additions to ¦Á-chiral ¦Á-diphenylphosphinoyl alkenes gave two diastereoisomeric products in all cases studied. The configurations of these isoxazolidines were assigned by analogy with the achiral cases, and also by analogy with the addition of nitrile oxides to the same alkenes. This conversion also demonstrated the potential of this method for the synthesis of 2-(alk-2′-enyl)piperidines having defined double-bond geometry.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Name: Allyldiphenylphosphine oxide.

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

Schilling, M. L. published the artcileAcrylate Oligomer-Based Photopolymers for Optical Storage Applications, SDS of cas: 2909-77-5, the publication is Chemistry of Materials (1999), 11(2), 247-254, database is CAplus.

Photopolymers are attractive candidates for high-d. holog. data storage because of their high sensitivity and refractive index contrast. The authors incorporated several high-index organic monomers into high optical quality acrylate oligomer-based formulations. Using reactivity ratio, reaction kinetics, and component refractive indexes as guidelines, a 6-fold increase in ¦¤n has been achieved compared to an initial all-acrylate formulation. Samples prepared from these formulations have been used to write and read >200 high-quality holograms in a given volume of material. This is the first time a photopolymeric medium has successfully been used to multiplex this number of holograms. Using these resins, a protocol for the evaluation of photopolymers as holog. media has been developed.

Chemistry of Materials 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, SDS of cas: 2909-77-5.

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

Thakur, Punam published the artcileComplexation studies of Cm(III), Am(III), and Eu(III) with linear and cyclic carboxylates and polyaminocarboxylates, Application In Synthesis of 5411-14-3, the publication is Journal of Coordination Chemistry (2011), 64(18), 3214-3236, database is CAplus.

Solvent extraction and potentiometric titration methods were used to measure the stability constants of Cm(III), Am(III), and Eu(III) with both linear and cyclic carboxylates and polyaminocarboxylates in an ionic strength of 0.1 mol L^-1 (NaClO₄). Luminescence lifetime measurements of Cm(III) and Eu(III) were used to study the change in hydration upon complexation over a range of concentrations and pH values. Aromatic carboxylates, phthalate (1,2 benzene dicarboxylates, PHA), trimesate (1,3,5 benzene tricarboxylates, TSA), pyromellitate (1,2,4,5 tetracarboxylates, PMA), hemimellitate (1,2,3 benzene tricarboxylates, HMA), and trimellitate (1,2,4 benzene tricarboxylates, TMA) form only 1:1 complexes, while both 1:1 and 1:2 complexes were observed with PHA. Their complexation strength follows the order: PHA approx. TSA > TMA > PMA > HMA. Carboxylate ligands with adjacent carboxylate groups are bidentate and replace two H₂O mols. upon complexation, while TSA displaces 1.5 H₂O mols. of hydration upon complexation. Only 1:1 complexes were observed with the macrocyclic dicarboxylates 1,7-diaza-4,10,13-trioxacyclopentadecane-N,N’-diacetate (K21DA) and 1,10-diaza-4,7,13,16-tetraoxacyclooctadecane-N,N’-diacetate (K22DA); both 1:1 and 1:2 complexes were observed with methyleneiminodiacetate (MIDA), hydroxyethyleneiminodiacetate (HIDA), benzene-1,2-bis(oxyacetate) (BDODA), and ethylenediaminediacetate (EDDA), while three complexes (1:1, 1:2, and 1:3) were observed with pyridine 2,6 dicarboxylates (DPA) and chelidamate (CA). The complexes of M-MIDA are tridentate, while that of M-HIDA is tetradentate in both 1:1 and 1:2 complexes. The M-BDODA and M-EDDA complexes are tetradentate in the 1:1 and bidentate in the 1:2 complexes. The complexes of M-K22DA are octadentate with one H₂O mol. of hydration, while that of K21DA is heptadentate with two H₂O mols. of hydration. Simple polyaminocarboxylate 1,2 diaminopropanetetraacetate (PDTA) and ethylenediamine N,N’-diacetic-N,N’-dipropionate (ENDADP) like ethylenediaminetetraacetate (EDTA) form only 1 : 1 complexes and their complexes are hexadentate. Polyaminocarboxylates with addnl. functional groups in the ligand backbone, e.g., ethylenebis(oxyethylenenitrilo)tetraacetate (EGTA), and 1,6 diaminohexanetetraacetate (HDTA) or with addnl. number of groups in the carboxylate arms diethylenetriamine pentaacetato-monoamide (DTPA-MA), diethylenetriamine pentaacetato-bis-methoxyethylamide (DTPA-BMEA), and diethylenetriamine pentaacetato-bis glucosaamide (DTPA-BGAM) are octadentate with one H₂O mol. of hydration, except N-Me MS-325 which is heptadentate with two H₂O mols. of hydration and HDTA which is probably dimeric with three H₂O mols. of hydration. Macrocyclic tetraaminocarboxylate, 1,4,7,10-tetraazacyclododecanetetraacetate (DOTA) forms only 1:1 complex which is octadentate with one H₂O mol. of hydration. The functionalization of these carboxylates and polycarboxylates affect the complexation ability toward metal cations. The results, in conjunction with previous results on the Eu(III) complexes, provide insight into the relation between ligand steric requirement and the hydration state of the Cm(III) and Eu(III) complexes in solution The data are discussed in terms of ionic radii of the metal cations, cavity size, basicity, and ligand steric effects upon complexation.

Journal of Coordination Chemistry published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C4H3Cl2N3, Application In Synthesis of 5411-14-3.

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

Passarella, Daniele published the artcileA Convenient Synthesis of ¦¤^7,8-Morphinan-6-one and Its Direct Oxidation to 14-Hydroxy-¦¤^7,8-morphinan-6-one, Formula: C15H14O3, the publication is Bioorganic & Medicinal Chemistry Letters (2002), 12(15), 1981-1983, database is CAplus and MEDLINE.

Synthesis of ¦¤^7,8-morphinan-6-one I (R₂ = bond) by Grewe cyclization of quinolinecarboxaldehyde derivative II and bromoketalization reaction of I (R = H) as crucial steps is described. Introduction of a hydroxyl group at 14-position is demonstrated by direct oxidation with MnO₂ in the presence of silica gel.

Bioorganic & Medicinal Chemistry Letters published new progress about 1860-58-8. 1860-58-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(3-(Benzyloxy)phenyl)acetic acid, and the molecular formula is C15H14O3, Formula: C15H14O3.

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

Abraham, Raymond J. published the artcileThe use of MM/QM calculations of ¹³C and ¹⁵N chemical shifts in the conformational analysis of alkyl substituted anilines, Product Details of C14H23N, the publication is Magnetic Resonance in Chemistry (2020), 58(6), 520-531, database is CAplus and MEDLINE.

The calculation of the ¹³C and ¹⁵N NMR chem. shifts by a combined mol. mechanics (Pcmodel 9.1/MMFF94) and ab initio GIAO B3LYP/DFT, 6-31 + G(d) procedure is used to investigate the conformations of a variety of alkyl substituted anilines. The ¹³C shifts are obtained from the GIAO isotropic shielding (Ciso) with sep. references for sp³ and sp² carbons (¦Äc = ¦Äref – Ciso). The ¹⁵N shifts are obtained similarly from the GIAO isotropic shielding (Niso) with reference to the ¹⁵N chem. shift of aniline. Comparison of the observed and calculated shifts provides information on the mol. conformations. Aniline and the 2,6-dialkylanilines exist with a rapidly inverting sym. pyramidal nitrogen atom. The 2-alkylanilines have similar conformations with the NH₂ group tilted away from the 2-alkyl substituent. The N,N-dialkylanilines show more varied conformations. N,N-dimethylaniline has a similar structure to aniline, but N-Et, N-methylaniline, N,N-diethylaniline, and N,N-diisopropylaniline are conformationally mobile with two rapidly interconverting conformers. In contrast, the anilines substituted at C₂ and the nitrogen atom exist as one conformer where the steric interaction between the C₂ substituent and the N substituent determines the conformation. In 2-methyl-N-methylaniline, the nitrogen atom is pyramidal as usual with the N-Me opposite to the 2-Me, but in 2-methyl-N,N-dimethyl aniline, the NMe₂ group is now almost orthogonal to the Ph plane. This is also the case with 2-methyl-N,N-diethylaniline and 2,6-diisopropyl-N,N-dimethylaniline. The comparison of the observed and calculated ¹⁵N chem. shifts confirms the above findings, in particular the pyramidal conformation of aniline and the above observations with respect to the conformations of the N,N-dialkylanilines.

Magnetic Resonance in Chemistry 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, Product Details of C14H23N.

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

Bochenska, Maria published the artcileSulfonamides as ionophores for ion-selective electrodes. I, Application In Synthesis of 1798-04-5, the publication is Journal of Inclusion Phenomena (1987), 5(6), 689-94, database is CAplus.

o-R¹RNCOC₆H₄SO₂NRR¹, o-(R¹RNSO₂)₂C₆H₄, 2,4-R¹RNSO₂(Me₃C)C₆H₃OCH₂CONR²R³ [R = R¹ = Et, Bu, CH₂CHMe₂, CH₂Ph; R = Et, R¹ = Ph; NRR¹ = morpholino, piperidino, NH(CH₂)₁₃Me; R² = R³ = Bu, CH₂CHMe₂), and X[CON(CHMe₂)₂]₂ (X = o-C₆H₄, o-C₆H₄OCH₂, 1,2-cyclohexanediyl) were prepared for use as ion-selective ligands in liquid membrane electrodes. Most of the ligands preferentially chelated K.

Journal of Inclusion Phenomena published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Application In Synthesis of 1798-04-5.

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

Lis, Stefan published the artcileLuminescence study of europium(III) complexes with several dicarboxylic acids in aqueous solution, SDS of cas: 5411-14-3, the publication is Journal of Alloys and Compounds (1995), 225(1-2), 257-60, database is CAplus.

Luminescence lifetimes of Eu(III) in complexes with dicarboxylate ligands and N, O or S donors have been measured in H₂O and D₂O solutions of varying pH and europium-ligand ratio. The ligands were iminodiacetate (IDA), diglycolate (DGA), thiodiglycolate (TDA), dipicolinate (DPA), benzene-1,2-bis(oxyacetate) (BDODA), ethylenediaminediacetate (EDDA) and ethylene-1,2-dithiodiacetate (EDTDA). The lifetimes have been used to measure the number of water mols. coordinated to the Eu(III) ion in each complex. The results show that in the 1:1 and 1:2 complexes the ligands: IDA, DGA and DPA are tridentate whereas the TDA complexes are bidentate. BDODA and EDDA form tetradentate 1:1 and bidentate 1:2 complexes, while EDTDA is bidentate in both the 1:1 and 1:2 complexes. These results indicate that the nitrogen and oxygen donors are bonded to lanthanide ions in the DGA, IDA, DPA and EDDA complexes, whereas the sulfur donors are not bonded in the TDA and EDTDA complexes.

Journal of Alloys and Compounds published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C10H10O6, SDS of cas: 5411-14-3.

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