Rhone-poulenc Nederland B.v.

Union Carbide Corporation

Constance A Fellows

Wallace Y Fu

Patrick G Hecht

Steven B Levin

This invention relates to a process for preparing 2-methyl-2-(methylthio) propionaldehyde O-(methylcarbamoyl) oxime as an aqueous wet cake by reacting 2-methyl-2-(methylthio) propionaldehyde oxime with methyl isocyanate in the presence of an aqueous medium. This invention also relates to an aqueous wet cake composition containing 2-methyl-2-(methylthio) propionaldehyde O-(methylcarbamoyl) oxime.

Process for preparing 2-methyl-2-(methylthio) propionaldehyde

This invention relates to a process for preparing 2-methyl-2-(methylsulfonyl) propionaldehyde O-(methylcarbamoyl) oxime as an aqueous wet cake by reacting 2-methyl-2-(methylthio) propionaldehyde oxime with methyl isocyanate in an aqueous medium to give 2-methyl-2-(methylthio) propionaldehyde O-(methylcarbamoyl) oxime which is then oxidized in an aqueous medium to give 2-methyl-2-(methylsulfonyl) propionaldehyde O-(methylcarbamoyl) oxime. This invention also relates to an aqueous wet cake composition containing 2-methyl-2-(methylsulfonyl) propionaldehyde O-(methylcarbamoyl) oxime.

Process for preparing 2-methyl-2-(methylsulfonyl) propionaldehyde

2,3-Dihydro-2,2-dimethyl-7-hydroxybenzofuran is prepared by reacting catechol with isobutylene oxide or with a compound having the general formula ##STR1## wherein R is halogen or hydroxyl, and X is halogen, in the presence of a base to form the intermediate 2-(2-hydroxy-2-methylpropoxy) phenol and then thermally dehydrating, rearranging and cyclizing the resulting intermediate phenol in the presence of an acid catalyst to form 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofuran.

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Durham, NC, United States of America

Constance A Fellows