Abstract
The development of manganese-catalyzed carbomagnesation of alkynes is reviewed. Manganese salts mediate the efficient addition of a variety of Grignard reagents to alkynes. Allyl, aryl, and alkyl Grignard reagents participate in these reactions. In many cases, a hetero atom such as oxygen or nitrogen in substrates facilitates the addition reaction. Stoichiometric carbometalation reactions with manganese ate complexes are also discussed, as is cyclization of 1,6-diynes and 1,6-enynes via carbometalation with triallylmanganate.
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