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slowly. This mixture was subsequently stirred at room temperature for 2 h, after which it was diluted with 400 ml of water and the product was isolated by extraction with ether. Evaporative distillation afforded 1.34 g (62%) of unsaturated ester 3b: bp 78-82 °C (bath temperature, 0.1 mm) [lit.14 bp 136-138 °C (16 mm)]; Xmax

ditions previously shown to produce no fractionation.6 g This indicates that the contribution of the cuprite oxygen to the density of the water formed from it is 5.5 p. p. m. less than that of atmospheric oxygen. This is only 1 p. p. m. less than the difference between the density contributions of atmospheric and ordinary water oxygen6 and indicates therefore that the isotopic composition of the cuprite oxygen is practically the same as that of ordinary water.This probably indicates that the original copper sulfide deposit was altered by reaction with water and not with atmospheric oxygen.

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Pages 73-79. The reaction of cyclopropylphenylcarbinol with phosphorus tribromide at -15°g ives 4rbromo-l-phenyl-1-butene, identified by its nmr spectrum and by its conversion to trans-1phenyl-1,3-butadiene on treatment with sodium amide in liquid ammonia, rather than cyclopropylphenylcarbinyl bromide, in confirmation of the report of A. Maercker and J. D. Roberts, J.