1. European Journal of Organic Chemistry, Volume 2011, Issue 15, pages 2827–2835
Building Heterocyclic Systems with RC(OR)2+ Carbocations in Recyclable Brønsted Acidic Ionic Liquids: Facile Synthesis of 1-Substituted 1H-1,2,3,4-Tetrazoles, Benzazoles and Other Ring Systems with CH(OEt)3 and EtC(OEt)3 in [EtNH3][NO3] and [PMIM(SO3H)][OTf]
Gopalakrishnan Aridoss, Kenneth K. Laali
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http://dx.doi.org/10.1002/ejoc.201100128