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A reaction with methylene

The phosphonic group can be introduced in position 4 of a pyran ring (66) by utilization of phosphorus-containing UN 67 in a reaction with methylene-active ketones 35 or 36 on continuous heating in ethanol (00PS(165)17) (Scheme 15). [Pg.191]

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A-Thioiminium salts reactions with active methylene compounds

A-methylenation

Methylenation reaction

Methylene reactions

Reaction with methylene

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