2-bromo-1-(2-hydroxyphenyl)-3,4-dimethylpentan-1-one: A New Bromo-Compound with Stimulatory Activity Isolated from the Shed Leaves of Teak, (Tectona grandis L.)

Suparna Mandal  Biswas,

2-bromo-1-(2-hydroxyphenyl)-3,4-dimethylpentan-1-one: A New Bromo-Compound with Stimulatory Activity Isolated from the Shed Leaves of Teak, (Tectona grandis L.)

Abstract:

from the Methanol Fraction of Teak leaves (MFTk). Chromatographic and spectral analyses (TLC, UV, MS, NMR, and IR) indicated the compound to be 2-bromo-1-(2-hydroxyphenyl)-3,4- dimethylpentan-1-one, in short, BrHPDMP with molecular wieghts 285 and 287. The whole leaf leachate of teak showed strong inhibitory activity in bioassay. But when fraction-4 (Methanolic fraction of teak leaf) was isolated and purified, it showed concentration dependent stimulatory activity on rice seeds. At 1000 ppm concentration, it showed 12.82% inhibition in shoot and 15.59% stimulation in root length. Below this concentration, it showed stimulatory effects on both shoot and root length. At 500ppm, it revealed 10.04% stimulation in shoot length and 34.16% stimulation in root length. At a concentration of 31.25ppm, it revealed maximum stimulatory effects i.e. 16.26% stimulation in shoot length and 42.78% stimulation in root length.

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