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8 and which a l s o d i s s o c i a t e s to give the amidyl and n i t r i c oxide r a d i ­ c a l s (Eq. 9 ) . Primary Photoprocesses of Nitrosamides Why does t h e r m o l y s i s of nitrosamide cause the s c i s s i o n of the N-CO bond whereas p h o t o l y s i s r e s u l t s i n s c i s s i o n of the N-NO bond? The former might be understood i n terms of an inbalance i n e l e c t r o n e g a t i v i t i e s of the s u b s t i t u e n t s (vide supra) which weaken the N-CO bond; v i b r a t i o n a l e n e r g i e s , t h e r e f o r e , cause the s c i s ­ s i o n of the weakest bond.

Kleinspehn, G. G . , and Duckworth, A. C . , J . Am. Chem. , 89, 3858 (1967). Edwards, O. , and Rosich, R. , Can. J. , 45, 1287 (1965). Chow, Y. , and Tam, J . Ν. , J . Chem. Soc. , 1138 (1970). Chow, Y. , Tam, J . Ν. , Colon, C. , and P i l l a y , K. , Can. J . , 51, 2469 (1973). Chow, Y. , Tam, J . Ν. , and P i l l a y , K. , Can. J. , 51, 2477 (1973). Tam, J . N. , and Chow, Y. , Tetrahedron, 31, 1123 (1975). , and Williams, G. , Advan. Free Rad. , 3, 199 (1969). Hesse, R. Η . , Advan. Free Rad.

Among many publications, for example, Magee, P. Ν . , and Barnes, J . , Advan. , 10, 163 (1967). , and Hareld, G . , Ann. , Ann. , 599, 161 (1956). Streitwieser, Α . , J r . , and Schaeffer, W. , J . Am. Chem. , 79, 2888 (1957). Moss, R. Α . , Roger, D. , and Emery, Ε. , J . Am. Chem. , 92, 1366 (1970). Gutsche, C. , and Tao, I. Y. C . , J. Org. , 32, 1778 (1967); Gutsche, C. , and Johnson, Η. Ε . , J . Am. Chem. , 77, 109 (1955); Gutsche, C. , and Bowers, J . , J . Org. , 32, 1203 (1967). Chow, Y.

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