Synthesis and Reactions of (4H- and 2H-2,6-Diphenylthiopyran-4-yl)phosphonates

Article abstract of DOI:10.1021/jo01300a038

The umpolung of 2,6-diphenylthiopyrylium salts is achieved by the synthesis of the Wittig-Horner reagent of diethyl (2,6-diphenyl-4H-thiopyran-4-yl)phosphonate (7).This 4H-lithiated species is a kinetically controlled product which equilibrates to the mor