ELECTROPHILIC 3,5-SUBSTITUTION OF 2,4,4,6-TETRAPHENYL-4H-PYRAN AND SOME OF ITS 1-HETEROANALOGUES

Article abstract of DOI:10.1135/cccc19920546

The reaction of dibromine with the heterocycles I-IV gives corresponding 3,5-dibromo derivatives, while the less selective reactions with dichlorine afforded 3,5-dichloro derivative XII only in the case of 4H-thiopyran IV and trichloro derivative of the p