Res Chem Intermed (2015) 41:6843–6858 DOI 10.1007/s11164-014-1782-7 Novel crown ether functionalized imidazolium-based acidic ionic liquid catalyzed synthesis of pyrazole derivatives under solvent-free conditions • • Dayanand Patil Dattatraya Chandam • • • Abhijeet Mulik Suryabala Jagdale Prasad Patil Madhukar Deshmukh Received: 19 April 2014 / Accepted: 1 August 2014 / Published online: 3 September 2014 Springer Science+Business Media Dordrecht 2014 Abstract An innovatively designed novel crown ether functionalized imidazolium- based reusable acidic ionic liquid [crown ether MIm] [HSO ] has been efﬁciently implemented for the synthesis of pyrazole derivatives using various substituted enami- nones, hydrazine hydrate and phenyl hydrazine under solvent-free conditions. Structural novelty and task efﬁciency of the catalyst, high yields of desired products, greener approach attributing high atom economy and solvent-free conditions render this protocol suitable to cope with the current demand in contemporary organic chemistry. The inventive idea of utilizing crown ether functionalized ionic liquid as a catalyst was for the ﬁrst time demonstrated in this protocol. Keywords Pyrazole Crown ether functionalized ionic liquid Solvent-free conditions b-enaminone Introduction Innovations made in the design of a novel, task-efﬁcient and considerably greener catalyst along with its implementation in the synthesis of signiﬁcant human welfare molecular
Research on Chemical Intermediates – Springer Journals
Published: Sep 3, 2014
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