Alkylidenes of Cyclic 1,3 Diones : Amine Catalysed Knoevenage Reaction

G. S. Jawanda, Swaranjit Singh, Gurpreet Kaur and Baldev R. Chhabra

Department of Chemistry Punjab Agricultural University, Ludhiana India.

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ABSTRACT:

Mannich bases formed during the preparation of alkylidene, exist in equilibrium mixture of keto and enol forms. The percentage of keto and enol forms is calculated from 13C NMR spectroscopic studies, Tbe ketoform undergo smooth elimination to give corresponding alkylidene, But in case of enol form the bis-adduct was obtained. The branch chain aldehydes afford tbe corresponding alkylidene, while in case of open chain aldehydes the bis-adduct predominates. In case of Meldrum's acid, only keto form is obtained.

KEYWORDS:

Diones; Amine; Catalysed; Knoevenage; Reaction