Ethynylmagnesium bromide:

A Grignard reagent, that in this reaction acts as a nucleophile to reduce a carbonyl group. Grignard reagents are organometallic reagents used to form new carbon-carbon bonds.

Sigma-Aldrich. http://www.sigmaaldrich.com/chemistry/chemistry-products.html?TablePage=16243454 (acessed March 18, 2014).

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