Add time:08/02/2019         Source:sciencedirect.com

The exocyclic double bond in 4-arylidene-3-methylisoxazolin-5-ones (IV) undergoes addition reactions with Grignard reagents and with aromatic hydrocarbons in the presence of aluminium chloride.The behaviour of the hetero-ring in 4-substituted 3-methylisoxazolin-5-ones towards the action of hydrazines has been investigated. Whereas, the corresponding pyrazolines (X) are obtained in the case of hydrazine hydrate, the intermediate hydrazides (XI) have been successfully isolated in the case of phenylhydrazine. The hydrazides are readily cyclized under different experimental conditions to yield different products.

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