Preparation of ketene O,N-acetals

Details Preparation of ketene O,N-acetals Preparation of ketene O,N-acetals

1987-02-05

1988-06-28

Hollrah, Glennon H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548333, 548341, 548378, C07D24908, C07D23360, C07D23112, C07D23506

Patent

active

047540443

ABSTRACT:
Ketene O,N-acetals of the formula I ##STR1## where R.sup.1 is tertiary alkyl of 4 to 6 carbon atoms, R.sup.2 is hydrogen, R.sup.3 is phenyl which is unsubstituted or substituted by halogen, alkoxy, alkyl, phenyl, phenoxy, cyano, nitro or trifluoromethyl and ##STR2## is a triazole, pyrazole, benzimidazole or imidazole radical, are prepared by a process in which a ketene O,O-acetal of the formula II ##STR3## where R.sup.1, R.sup.2 and R.sup.3 have the above meanings and R.sup.4 is phenyl which is unsubstituted or substituted by halogen, alkoxy, alkyl, phenyl, phenoxy, cyano, nitro or trifluoromethyl, is reacted with a compound of the formula ##STR4## where ##STR5## has the above meanings, at elevated temperatures.

REFERENCES:
patent: 2883368 (1959-04-01), Middleton
patent: 3531494 (1970-09-01), Adolphi et al.
patent: 3641248 (1972-02-01), Adolphi et al.
patent: 4147791 (1979-04-01), Meiser et al.
patent: 4539160 (1985-09-01), Ruland et al.
H. D. Stachel, Chem. Ber., vol. 93 (1960), 1059-1063.
Middleton, Chem. Abstracts, vol. 53, Cal. 18872 (1959).
Borrmann, Houben-Weyls Methoden der Organischen Chemie, vol. 74 (Stuttgart, 1968), pp. 362-364.

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