Cm. Hu et al., DIELS-ALDER REACTION OF 1-PHENYLSULFONYL-3,3,3-TRIFLUOROPROPYNE WITH 1,3-DIENES, Journal of fluorine chemistry, 66(3), 1994, pp. 215-217
1-Phenylsulfonyl-3,3,3-trifluoropropyne, prepared in situ from 1-pheny
lsulfonyl-2-bromo-3,3,3-trifluoropropene and triethylamine, reacted wi
th 1,3-dienes to give the [4 + 2] cycloadducts and/or 2-trifluoromethy
lphenyl phenylsulfone in good to excellent yield.