Process for unsymmetrical dithioacetals and dithioketals.

摘要

This invention relates to a novel process for preparing unsymmetrical dithioacetals and dithioketals from aryl aldehydes and ketones comprising: a) allowing one part by moles of a compound of the formula <CHEM> to react, in a suitable organic solvent, with a mixture of about 0.8 to 1.2 parts by moles of a thiol of the formula R<2>SH and an excess of a suitable hexaalkyldisilazane, in the presence of a suitable N-heterocycle catalyst, to form a trialkylsilylated hemithioacetal intermediate of the formula <CHEM> b) allowing the trialkylsilylated hemithioacetal intermediate to react, in a suitable organic solvent, with at least about 0.8 to 1.2 parts by moles of a thiol of the formula R<3>SH, in the presence of a suitable Lewis acid. t