Plant-Growth Activity of α-Alkylphenylacetic Acids and 1,2-Benzo-1-cycloalkene-3-carboxylic Acids

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Abstract

1,2,3,4-Tetrahydro-1-naphthoic acid (1,2-benzo-1-cyclohexene-3-carboxylic acid) was found to have a high plant-growth activity. Its lower homologue, 1-indancarboxylic acid (1,2-benzo-1-cyclopentene-3-carboxylic acid) was reported later to be considerably active though less than the former1. In the homologous series of these two acids, the 1,2-benzo-1-cycloalkene-3-carboxylic acids, the spatial relation of the carboxyl group to the ring system is influenced by the alicyclic ring structure. On the other hand, in the α-alkylphenylacetic acids, which may be regarded as the ‘open forms’ of the above acids, it is unnecessary to consider such an influence on the carboxyl group. In order to examine the effect on plant-growth activity of such a difference in the structure, we tested activities of these series of compounds in the pea straight-growth test.

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KAWAZU, K., FUJITA, T., MITSUI, T. et al. Plant-Growth Activity of α-Alkylphenylacetic Acids and 1,2-Benzo-1-cycloalkene-3-carboxylic Acids. Nature 187, 694–695 (1960) doi:10.1038/187694a0

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