Polymer-supported sulphonic acid catalyzed cross-aldol condensation: An expeditious synthesis of α,α′-bis(substituted benzylidene) cycloalkanones

Polymer-supported sulphonic acid (NKC-9) efficiently catalyzed the cross-aldol condensation of arylaldehydes and cycloketones to afford α,α′-bis(substituted benzylidene) cycloalkanones in good yields. The catalyst can be recovered simply and reused.