Benzazolin-2-thiones in the michael reaction. 1. Reaction of benzothiazolin- and benzoxazolin-2-thiones with acrylonitrile, acrylamide, and methylacrylate in the presence of acid catalysts
Benzazolin-2-thiones in the michael reaction. 2. Reaction of benzothiazolin- and benzoxazolin-2-thiones with acrylonitrile, acrylamide, and methyl acrylate in the presence of basic catalysts