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Notes 252 nm (e 760), 257 (740); nmr r 8.46 (s, 6 H) and 9.82 (s, 9 ).Experimental Section 3-Phenylbut-l-yne (IV).-A solution of dilithio-l-phenylpropyne was prepared as reported1 from 1 g of 1-phenylpropyne and 14.5 ml of 1.2 F butyllithium in ether. This solution was cooled in an acetone-Dry Ice bath and gaseous methyl bromide was bubbled through it during 15 min. The reaction mixture was allowed to reach room temperature and poured on ice, and the ether layer separated. The reaction product, containing 80% of IV and 20% of 1-phenylpropyne, was separated into its components by glpc.Anal. Caled for Ci0Hi0: C, 92.31; H, 7.69. Found: C, 92.42; , 7.81.l-Trimethylsilyl-3-phenylbut-l-yne (V) was prepared as above but trimethylchlorosilane was added after the product of reaction with methyl bromide reached room temperature. The solution was left overnight and poured on water and the product in the ether layer purified by glpc on Apiezon L on Chromosorb, yield 80%.

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