REACTION OF POLYSUBSTITUTED 4H-THIOPYRANS WITH TRIFLUOROACETIC ACID IN SALT-FORMATION AND IONIC-HYDROGENATION REACTIONS

Article abstract of DOI:10.1007/BF00506426

Depending on their structure, tetra- and pentasubstituted 4H-thiopyrans either undergo disproportionation or form salts with the participation of air oxygen upon reaction with trifuoroacetic acid.It is shown that these processes are competitive.The previously proposed scheme for the disproportionation of 4H-thiopyrans with protic acids was proved experimentally.The positions at which protonation of the double bonds of the heterorings occurs were established as a result of ionic hydrogenation of the 4H-thiopyrans.