1,3-Disulfonic acid imidazolium hydrogen sulfate {[Dsim]HSO4} as a highly efficient, recyclable and green catalyst for the preparation of α,α´- bis(arylidene)cycloalkanones

A highly efficient and simple method for the preparation of α,α´-bis(arylidene)cycloalkanonesunder solvent-free conditions has been developed. The crossed-aldol condensation ofcycloalkanones (Eq. 1) with arylaldehydes (Eq. 2) in the presence of 2.5 mol% of ionic liquid1,3-disulfonic acid imidazolium hydrogen sulfate {[Dsim]HSO4} afforded the title compounds inhigh yields and short reaction times. The catalyst has dual-functions and it is so because ofpossessing three acidic functional groups with different Brønsted acidic and basic sites. Highcatalytic activity and low loading of the catalyst can be attributed to its dual-functions

1,3-Disulfonic acid imidazolium hydrogen sulfate {[Dsim]HSO4} as a highly efficient, recyclable and green catalyst for the preparation of α,α´- bis(arylidene)cycloalkanones Keywords:

α , α´-Bis(arylidene)cycloalkanone , 1 , 3-disulfonic acid imidazolium hydrogen sulfate{[Dsim]HSO4} , acidic ionic liquid , crossed-aldol condensation , cycloalkanone , arylaldehyde