Preparation of 2-vinylimidazoles by dehydrogenation of 2-ethylim

Details Preparation of 2-vinylimidazoles by dehydrogenation of 2-ethylim Preparation of 2-vinylimidazoles by dehydrogenation of 2-ethylim

1982-05-19

1983-10-18

Schwartz, Richard A.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548346, 548347, C07D23358

Patent

active

044107064

ABSTRACT:
A method for preparing 2-alkenylimidazoles from readily available 2-alkylimidazoles or 2-alkylimidazolines by dehydrogenating the 2-alkylimidazole or 2-alkylimidazoline in the presence of a suitable dehydrogenation catalyst. The preferred method provides 2-vinylimidazole by dehydrogenating 2-ethylimidazole or 2-ethylimidazoline. The reaction is advantageously carried out in a vapor phase in the presence of an inert carrier gas using as preferred dehydrogenation catalysts, copper chromites and catalysts comprising one or more of the metals molybdenum, iron, cobalt, zinc or chromium on non-reducible oxide supports such as alumina or silica.

REFERENCES:
patent: 4340744 (1982-07-01), Schwarz et al.
Houben-Weyl, Methoden der Organischen Chemie, vol. V/16, Georg Thieme, Stuttgart, 1972, pp. 44-45.
Kirk-Othmer, Encyclopedia of Chemical Technology, 2nd Ed., Supplement vol., John Wiley, New York, 1971, pp. 653-655.

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