Abstract
The reaction of alkynyllithium reagents with methyl dialkylborinates in tetrahydrofuran proceeds readily to form lithium methyl alkynyldialkylborinates. ▪ Reaction of this ”rate“ complex with 1.3 equivalent of boron trifluoride diethyl etherate gives the alkynyldialkylboranes in essentially quantitative yield. ▪
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