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Moreover, a phosphine\u2010catalyzed formal [3+2] annulation between 4,4\u2010dicyano\u20102\u2010methylenebut\u20103\u2010enoates and maleic anhydride has been also achieved, and maleic anhydride behaved as a C<jats:sub>3<\/jats:sub>\u2005synthon in the reaction, thus efficiently affording the functionalized cyclopentenones. A stable phosphinium\u2010containing zwitterionic compound is the key reactive intermediate in both annulations and was successfully isolated. 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