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Representative Procedure for the Synthesis of 4: Alkyne 2
(1.2 mmol) was added slowly to the mixture of 1,3-diketone 1b (1c)
(0.5 mmol), CoIII catalyst (5 mol-%) and Cu(OTf)2 (5 mol-%) in an
oven-dried round-bottomed flask and stirred the mixture for
60 min. The reaction mixture was directly purified by column chro-
matography using silica gel (100–200 Mesh) as stationary phase and
n-hexane (100 %) or 1 % mixture of ethyl acetate in n-hexane as
eluent.
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Acknowledgments
G. K. V. is thankful to UGC for Dr. D. S. Kothari Post Doctoral
Fellowship and contingency grant [letter No. F.4-2/2006 (BSR)/
CH/14-15/0226, dated 14th August 2015]. M. R. acknowledges
CSIR for the award of Shyama Prasad Mukherjee Fellowship [File
No: SPM-09/045(0249)/2016-EMR-I]. We thank USIC-CIF, Univer-
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Keywords: Alkynes · Cobalt · Copper · Cyclization ·
Homogeneous catalysis · Ketones
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Received: May 20, 2019
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