By John E Leffler

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Calvin, /. Am. Chem. M. Kasha, Chem. , 41, 401 (1947). , 67, 1232 (1945). is possible to convert a classical diradical formula into a classical non-radical formula by a process of opening and closing double bonds. This electrons are on nitrogen. 76 is true of porphyrindine only if the unpaired A. Etienne, Traitf de Chimie Organique, Volume XVII, Masson et Cie, Paris, 1949, p. 1299. DIRADICALS 43 On' heating, rubrene peroxide gives up most of rubrene. its oxygen to regenerate heat The explanation for these diradical reactions can not be quite so simple as the one hinted at above however, since the of rubrene peroxide does not appear to quantum yield depend only on the concentramolecules but also on the con- tion of photoactivated rubrene triplet centrations of rubrene itself and of oxygen.

53, 676 (1931). H. E. Bent and N. B. Keevil, /. Am. Chem. , 58, 1228 (1936). J. CHAPTER l8 I unsymmetrical ethane or ion complex shown below could be isolated : OCH 3 O a N/^ Reaction with other radicals is characteristic of the triarylmethyls and the chain reaction with oxygen has already been discussed. The absorption of the radical nitric oxide is also used as an analytical inethod for triphenylmethyl. 2 + < 3 c o NO 31 Triphenylmethyl reacts with atomic hydrogen and with methyl free radicals when a solution of it is exposed to a gas stream containing the other radicals.

J. B. Conant, L. F. Small, and B. S. Taylor, /. Am. Chem. , 47, 1959 (1925). 89 80 B. Conant and N. M. Bigelow, /. Am. Chem. , 53, 676 (1931). H. E. Bent and N. B. Keevil, /. Am. Chem. , 58, 1228 (1936). J. CHAPTER l8 I unsymmetrical ethane or ion complex shown below could be isolated : OCH 3 O a N/^ Reaction with other radicals is characteristic of the triarylmethyls and the chain reaction with oxygen has already been discussed. The absorption of the radical nitric oxide is also used as an analytical inethod for triphenylmethyl.

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The reactive intermediates of organic chemistry by John E Leffler


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