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March, 1949 0-, m-AND P-t-BUTYLTOLUENES 873

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NOTES 2107To the ether solution containing the ester was added a trace of picric acid to prevent polymerization. It was then dried over magnesium sulfate, filtered and the ether removed. 'The residue was distilled through a six-in$ helices-packed column. at 5 mm., nZ0D 1.5285, and a 5-g. fraction boiling a t 132' a t 5 mm., nZoD 1.5310, were collected. At this point, extensive polymerization occurred and the column was filled with solid polymer. The 5-g. fraction was redistilled through a 15-cc. modified Claisen flask and 4 g. of product was obtained boiling a t 110' at 1 to 2 mm., nZ0D 1.5287. The yield of d-s-butyl p-vinylbenzoate was 8 g. (1570)

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