A Pd/Ni-free copper-catalysed tandem synthesis was realized for rapid access to unsymmetrical 1,3-diynes from 1,1-dibromoalkenes and terminal alkynes. This method was extended to the straightforward synthesis of unsymmetrical 2,5-disubstituted thiophenes in a one-pot operation.
M. L. N. Rao, S. S. Islam and P. Dasgupta, RSC Adv., 2015, 5, 78090 DOI: 10.1039/C5RA15705F
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