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Vol. 68 nitro-4-methoxybromobenzene used) of slightly brownishyellow plates, m. p. 110-112°. A further recrystallization from alcohol after long boiling with charcoal gave pale yellow plates, m. p. 112-113°.

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Thermal Decomposition of Cyclobutanone 6271 tetramethylene biradicals which have been assumed to be intermediates in the photolysis of cyclopentanone.5•6 The formation of butene and ethylene from the tetramethylene biradical has been observed by Bawn and Milsted30 in their study of the reaction of 1,4-dibromobutane and sodium at 300°.In spite of the data which are available the com-(30) C. E, H, Bawn and J. Milsted, Trans. Faraday Soc., 35, 889 (1939).plexity of the cyclopentanone decomposition precludes a thorough consideration of the detailed mechanism at the present time.Acknowledgment.-The authors wish to thank Mr. Carl Whiteman for making the infrared measurements and Dr. F. L. Mohler of the National Bureau of Standards for the mass spectrometric analyses.