Ring-opening of 4H-thiapyran-4-thiones. A synthesis of 6a-thiathiophthene
Abstract
4H-Thiapyran-4-thiones are ring-opened by nucleophiles in dimethyl sulphoxide or NN-dimethylformamide giving intermediates which are oxidised to 6a-thiathiophthenes or 3-acylmethylene-1,2-dithioles.