Tetrahedron Lett., 46 (2005) N 10, 1721-1724
Copper(II) tetrafluoroborate as a novel and highly efficient catalyst for Michael addition of mercaptans to alpha,beta-unsaturated carbonyl compounds.
Garg Sanjeev K., Kumar Raj, Chakraborti Asit K
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http://dx.doi.org/10.1016/j.tetlet.2005.01.051 
