Societe Nationale Des Poudres Et Explosifs

Jonathan T Martz

Roy A Olofson

Jean-Pierre G Senet

Marc D Piteau

Guy C Cagnon

Gary P Wooden

A process for the preparation of vinyl carbamates of formula I ##STR1## is described which comprises heating an .alpha.-halogeno-carbamate of formula II ##STR2## in which X is a halogen atom at a temperature between 70.degree. and 250.degree. C. for a period of time between several minutes up to several hours. R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are the same or different. The process is applicable to a great variety of products in which R.sub.1, R.sub.2, R.sub.3, and R.sub.4 have different meanings. The process permits to prepare in a simple and economical fashion, vinyl carbamates, which have industrial value and novel vinyl carbamates.

Process for the preparation of vinyl carbamates

Process for the synthesis of .alpha.-chlorinated chloroformates, and new .alpha.-chlorinated chloroformates. The invention relates to a new process for the manufacture of .alpha.-chlorinated chloroformates and, to new .alpha.-chlorinated chloroformates as new industrial products. The process according to the invention consists of a synthesis, by catalytic phosgenation, of .alpha.-chlorinated chloroformates of the formula: ##STR1## in which: R represents a substituted or unsubstituted hydrocarbon radical and m represents an integer superior or equal to one, this synthesis consisting in reacting phosgene with the aldehyde R--CHO).sub.m, in the presence of a catalyst which is an organic or inorganic substance which is capable in a medium containing an aldehyde of the formula R--CHO).sub.m, phosgene and, possibly, a solvent, of generating a pair of ions one of which is an halogenide anion and the other is a cation which is sufficiently separated from said halogenide anion so as to give to the latter a nucleophilic power enabling it to react with the function(s) aldehyde of the molecule R--CHO).sub.m.

Process for the synthesis of .alpha.-chlorinated chloroformates

Process for the synthesis of .alpha.-chlorinated chloroformates, and new .alpha.-chlorinated chloroformates. The invention relates to a new process for the manufacture of .alpha.-chlorinated chloroformates and, to new .alpha.-chlorinated chloroformates as new industrial products.

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State College, PA, United States of America

Jonathan T Martz