hylcarbamoyloxy-2-fluoro-2-(phenylsulfonyl)-ethene has been prepared a
nd reacted with a variety of dienes to give fluorinated [4+2] cycloadd
ucts. In contrast the desulfonated equivalent 1-(N,N-diethylcarbamoylo
xy)-2-fluoro-E-ethene reacts with cyclopentadiene alone, to give mixtu
res of [4+2] and [2+2] cycloadducts. Copyright (C) 1996 Elsevier Scien
ce Ltd.