The ccndensation reactions occurred when heating bis（perfluoroalkane-sulfonyl）methanes with aromatic aldehydes in acetic acid anhydrideand gave high yields of 1-aryl-2,2-di（perfluoroalkanesulfonyl）ethylenesThe perfluoroalkanesulfonyl groups RFSO2 are known as the strongestelectron-attracting substituents1-2.This property is often used in theactivation of C-C multiple and 2,2’-C-H bonds.The synthesis and reactionsof perfluoroalkanesulfonyl substituted alkenes and alkynes are of greatinterest in synthetic organic chemistry3-6.Recently,Hanack7 reported the preparation of 2-aryl-l-（perfluoroalkane-sulfonyl）acrylonitrile RFSO2C（CN）=CHAr.However,he failed to obtainthe 1,1-di（perfluoroalkanesulfonyl）alkenes by the Knoevenagel reactionof bis（perfluoroalkanesulfonyl）methane with aldehydes.
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