Loading patent…
AssigneeShin-Etsu Vinyl Acetate Co., Ltd.
InventorsYoshihiro Honma, Shozo Tanaka, Mitsuyoshi Oshima, Soji Tanioka, Fumiaki Kawamoto
Estimating the term…
Proposed is a novel and very efficient method for the preparation of an N-vinyl compound such as N-vinyl-2-pyrrolidone and N-vinyl-N-ethyl acetamide by the thermal decomposition of an N-(.alpha.-acyloxyethyl) compound which is a novel compound obtained by the addition reaction between an NH group-containing compound such as 2-pyrrolidone and N-ethyl acetamide and a vinyl carboxylate, e.g., vinyl acetate, in the presence of an alkali, e.g. alkali metal hydroxide. The reaction mixture after completion of this addition reaction as such, i.e. without isolating the N-(.alpha.-acyloxyethyl) compound, such as N-(.alpha.-acetoxyethyl)-2-pyrrolidone and N-(.alpha.-acetoxyethyl)-N-ethyl acetamide, is heated to effect in situ formation of the desired N-vinyl compound which can then be isolated by distillation under reduced pressure in a very high overall yield.
A method for the preparation of an N-vinyl compound represented by either one of the formulas ##STR4## in which R.sup.1 is a hydrogen atom or a monovalent hydrocarbon group, R.sup.3 is a monovalent hydrocarbon group, the subscript p is 0 or 1 and the subscript n is a positive integer not exceeding 10, which comprises the steps of:
Dependencies are inferred from the claim text.