C8HjCH2CH2CHBrCH2Br 33 34 29 C8H6(CH2)8CsH6 3 3 3(5) Ch. Provost, Bull. toe. chim., (4) 49, 1376 (1931).facilitate the removal of allylbenzene. The results of the various trials are summarized in Table II.Action of Chloral on j-Phenylbutylmagnesium Bromide.-In these experiments the usual procedure described above was followed except that no attempt was made to separate the 4-phenylbutene-l formed in the reaction. In all cases this was identified as the dibromide. The results are given in Table III. Summary 1.0 -Phenylethylmagnesium bromide, yphenylpropylmagnesium bromide and 5-phenylbutylmagnesium bromide reacted with chloral to give trichloroethanol, unsaturated hydrocarbons and coupling products.2. No secondary alcohols containing the trichloromethyl group were obtained under the conditions of these experiments.

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Dielectric constants as a function of the temperature of the homologous series of pure trimethyl end-blocked dimethyl siloxanes having from one to seven oxygen atoms have been measured.From these constants, together with density-temperature data and optical refraction data, the effective dipole moments in the concentrated liquids, the infrared dispersion, and the dipole, atomic, and electronic polarizations have been calculated by meansof theOnsager-Kirkwood theory. A special procedure was devised in order to apply this theory to the present case, where dipole moments are small and infrared dispersion is large. Two of the compounds are anomalous since they have a temperature-dependent apparent dipole moment, and this de-

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