Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 2-(7-Bromo-1H-indol-3-yl)acetic acid, is researched, Molecular C10H8BrNO2, CAS is 63352-97-6, about Growth of Avena coleoptiles and pH drop of protoplast suspensions induced by chlorinated indoleacetic acids.Quality Control of 2-(7-Bromo-1H-indol-3-yl)acetic acid.
Several indoleacetic acids, substituted in the benzene ring, were compared in the Avena straight growth bioassay. 4-Chloroindoleacetic acid (I) [2519-61-1], a naturally occurring plant hormone, was one of the strongest hormones in this bioassay. With an optimum at 10-6 mol/L, it was more active than indoleacetic acid [87-51-4], 2,4-dichlorophenoxyacetic acid [94-75-7], and naphthaleneacetic acid [86-87-3]. 5-Chloro- [1912-45-4] and 6-chloroindoleacetic acid [1912-44-3] are very strong auxins as well. Other derivatives tested have a lower activity. 5,7-Dichloro- [1912-40-9] and 5-hydroxyindoleacetic acid [54-16-0] have very low auxin activity at 10-4 mol/L and may be antiauxins. Some of the derivatives were compared for their effect on pH decline in stem protoplast suspensions of Helianthus annuus and Pisum sativum. The change of pH occurs without a lag period or with only a very short one. Derivatives which are very active in the Avena straight growth assay cause a larger pH decline than indoleacetic acid, while inactive derivatives cause effectively no pH decline.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com