Ppg Industries, Inc.

Steven E Pamer

Sidney B Richter

James A Cook, Jr

Frederick F Guzik

The yield and purity of 2-halomethyl-1,3-cyclic acetals is improved by subjecting the reaction product of 1,2-dihaloethyl acetate and aliphatic diol to alkaline hydrolysis. The resulting aqueous and organic phases are separated and the organic phase distilled to recover the 2-halomethyl-1,3-cyclic acetal product.

Process for producing 2-halomethyl-1,3-cyclic acetal

2-Alkylidene-1,3-dioxolanes and 2-(1-alkylalkylidene)-1,3-dioxolanes are employed as acid acceptors in methylchloroform, trichloroethylene or mixtures thereof. The preferred acid acceptor is 2-methylene-1,3-dioxolane. In another aspect of the invention, aliphatic aldehyde hydrazone is employed to stabilize 2-alkylidene-1,3-dioxolane and 2-(1-alkylalkylidene)-1,3-dioxolane. The preferred aliphatic aldehyde hydrazone is acetaldehyde dimethylhydrazone.

Unsaturated 1,3-dioxolane stabilized with aliphatic aldehyde hydrazone

This invention relates to a process for preparing herbicidally active substituted diphenylethers. Also, this invention provides novel intermediates useful in the production of said diphenylethers.

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Rittman, OH, United States of America

Steven E Pamer