By A. R. Katritzky

(from preface)The current quantity involves 5 chapters, 3 of that are on topics formerly lined in those advances.The photochemistry o( oxygen- and sulfur-containing heterocycles is complementary to the evaluate at the photochemistry oi' nitrogen heterocycles that seemed in quantity 30: jointly those chapters replace an past evaluate of the photochemistry of heterocycles (all via S. T. Reid). which seemed in 1970 in quantity II. Paudler and Sheets have up-to-date their overview of the overall chemistry o( naphthyridines, which additionally seemed in quantity II. additionally, van der Plas. Wo/niak. and van den Haak have particularly thought of the reactions of naphthyridines with nitrogen nueleophiles. mostly from their very own vast investigations during this area.Hermecv and Mes/aros have surveyed the chemistry of pyrido| l.2-

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J. Still, P. C. Arora. M. S. Chauhan, M. H. Kwan, and M . T. Thomas, Can. J . Chem. 54, 455 (1976). 232 233 234 H. Tsuruta, M . Ogasawara. and T. Mukai, Chmi. , 887 (1974). A. Padwa and A . Battisli, J . Am. Clrern. Soc. 94, 521 (1972). -P. Schuchmann and C. von Sonntag, J . Phoforhem. 13, 347 (1980). Sec. 240 ’” Y . Kobayashi, Y. Hanzawa, W. Miyashita, T. Kashlwagi, T. Nakano, and I . Kurnadaki, 23’ ’” 240 J . Am. Soc. 101. 5 (1979). R. D. Cockroft, E. E. Waali. and S. J. Rhoads, Terrohedron Let/..

J . Am. Chem. 99, 903 (1977);P. Chaquin, B. Furth, and J. Kossanyi. Rrcl. Truc. Chini. Pays-Bus 98, 346 (1979). 2 2 8 T. Yamagishi, T. Yoshimoto. and K . /rahedron L r / t . , 2795 (1971); C. Bernasconi, L. Cottier, and G . Descotes, Bull. Soc. Chim. , 101 (1977); B. W. Babock, D. R. Dimmel, D. P. Graves, and R. D. McKelvey, J . Org. Chem. 46, 736 (1981). 2 2 9 G. Remy, L. Cottier, and G. , 1847 (1979); P. M. Collins, R. lyer, and A . S. Travis, J . Chrm. , 446 (1978), and references quoted therein.

Yates, J . Ory. Chem. 35,3682 (1970) P. Yates. A . K. Verma, and J . C. L. Tam, J . C. S. Chrm. , 933 (1976). Sec. B] OXYGEN-A N D SULFUR-CONTAINING HETEROCYCLES 35 by ketene formation has been proposed i n 2,5-diphenyl-3(2H)-furanone (200)to account for photorearrangement to the lactone (201)' 6 2 A 2-benzyl2-liydroxybenzo [b]furan-3(2H)-one has been reported to undergo the photochemical equivalent of a benzilic acid rearrangement. ' 66 The photoreactions of 2(3H)- and 2(5H)-furanones have also been extensively investigated.

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