Journal
GREEN CHEMISTRY
Volume 11, Issue 2, Pages 269-274Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b815812f
Keywords
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Funding
- National Science Council of Taiwan [NSC96-2113-M-027-003-MY2]
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A cationic 2,2 '-bipyridyl palladium(II)/CuI system was proven to be a reusable and highly eficient catalyst for the homocoupling of terminal alkynes at room temperature using water as a solvent in the presence of TBAB under aerobic conditions. For aromatic terminal alkynes, the reaction was performed either with or without I-2 as an oxidant; the addition of I2 was required when aliphatic terminal alkynes were used as a substrate for the homocoupling reaction. In the presence of 0.0001-1 mol% palladium catalyst and 1 mol% CuI, a variety of terminal alkynes were homocoupled in good to excellent yields. The water-soluble catalytic system was separated from the organic products by extraction and the residual aqueous solution showed activity for reuse for several cycles without a significant decrease in activity.
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