Aberg, Borje published the artcilePlant-growth regulators. IX. p-Alkylphenoxyacetic and -propionic acids, and some related derivatives of naturally occurring phenols, Recommanded Product: 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Physiologia Plantarum (1954), 241-52, database is CAplus.
cf. C.A. 48, 5937a; 49, 10443h. The following compounds were studied to determine their auxin or antiauxin activity in the flax root test: (4-methylphenoxy)acetic acid (I); 2-(4-methylphenoxy)propionic acid (II); (4-ethylphenoxy)acetic acid (III); 2-(4-ethylphenoxy)propionic acid (IV); (4-isopropylphenoxy)acetic acid (V); 2-(4-isopropylphenoxy)propionic acid (VI); (4-tert-butylphenoxy)acetic acid (VII); 2-(4-tert-butylphenoxy)propionic acid (VIII); carvacroxyacetic acid (IX); thymoxyacetic acid (X); (4-chlorothymoxy)acetic acid (XI); eugenoxyacetic acid (XII); and isoeugenoxyacetic acid (XIII). Phenoxyacetic acid is antiauxinic but the introduction of the 4-Me group in I imparts some auxin activity which then diminishes with increasing size of the 4-alkyl substituent in III, V, and VII. A similar effect is observed with the series II, IV, VI, and VIII but these must be resolved into their respective enantiomorphs before a clear analysis is possible. XII and XIII also show conspicuous antiauxin activity, probably due to the bulky 4-alkyl substituents. IX is of intermediate activity, while the isomeric X shows only antiauxin activity which is greatly increased in XI by introduction of the Cl atom in the 4-position. This parallels the similar difference to be found between the 2,6-dichloro- and 2,4,6-trichlorophenoxyacetic acids.
Physiologia Plantarum 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, Recommanded Product: 2-(4-(tert-Butyl)phenoxy)acetic acid.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia