A Novel Functions For 4-Aroylpyrazolines and Isoxazolines in Growth Promoting Effects on Some Horticultural Crops

Abstract

Condensation of 2-substituted-3,5-dichloroacetophenones 2a-b obtained from the condensation of 2-hydroxy-3,5-dichloroacetophenone 1 and benzoyl chloride were dissolved in NaOH , on treatment under baker venkatraman transformation in presence of KOH with pyridine gives 1-(2-hydroxy-3,5- dichlorophenyl )-3-substituted-1,3propanedione 3a-b. Then converted into 3–aroyl-6,8-dichloroflavanones 4a-d by using different aromatic aldehyde in the presence of ethanol, Piperidine. The condensation of 4a-d and phenylhydrazinehydrochlorides, piperidine in DMSO gives 4-aroyl-∆2pyrazolines 5a-d.Condensation of 5a- d and hydroxylaminehydrochlorides gives 4-aroyl∆2- isoxazolines 6a –d. The above compounds are screened for their activities on horticultural plants and have been found to exhibit significant effects.