Preparation of ketene o,n-acetals

Details Preparation of ketene o,n-acetals Preparation of ketene o,n-acetals

C - Chemistry, Metallurgy

07

D

260/313, 260/315

C07D 231/12 (2006.01) C07D 233/00 (2006.01) C07D 235/06 (2006.01) C07D 249/08 (2006.01) C07D 521/00 (2006.01)

Patent

CA 1208648

- 12 - Abstract of the Disclosure: Ketene O,N-acetals of the formula I Image I where R1 is tertiary alkyl of 4 to 6 carbon atoms, R2 is hydrogen, R3 is phenyl which is unsubstituted or substituted by halogen, alkoxy, alkyl, phenyl, phenoxy, cyano, nitro or trifluoromethyl and -NR5 is a triazole, pyrazole, benzimidazole or imidazole radical, are prepared by a process in which a ketene O,O-acetal of the formula II Image II where R1, R2 and R3 have the above meanings and R4 is phenyl which is unsubstituted or substituted by halogen, alkoxy, alkyl, phenyl, phenoxy, cyano, nitro or tri- fluoromethyl, is reacted with a compound of the formula Image where -NR5 has the above meanings, at elevated tem- peratures.

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