By Alan R. Katritzky (Ed.)

(from preface)Volume forty three of Advances in Heterocyclic Chemistry consists of six chapters via a world set of authors. David Hewitt (Australia) presents us with the 1st to be had accomplished evaluate of heterocyclic 6-membered earrings containing phosphorus and nitrogen as heteroatoms: the azophosphorins.Chapters 2 and three, either authored by means of Wilhelm Flitsch (Federal Republic of Germany), deal, respectively, with the chemistry of the azaazulenes (not formerly coated considering that 1958) and of hydrogenated porphyrins, a category of accelerating value in biochemical procedures. The reactivity of ring-nitrogen atoms in azines towards electrophiles is roofed through M. R. Grimmett (New Zealand) and B. R. T. Keene (England) in bankruptcy 4.The longest bankruptcy of this quantity, authored through Roger Gallo and Christian Roussel (France) and Ulf Berg (Sweden), supplies a complete account of the quantitative therapy of steric results in hcteroaromatic compounds—a topic that has been complicated considerably through those authors. eventually, V. N. Charushin and O. N. Chupakhin (USSR) and H. С van der Plas (The Netherlands) evaluate reactions of azines with bifunctional nucleophiles.

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Ring-chain isomerizations have 22 23 24 25 42 [Sec. B WILHELM FLITSCH proved useful in the berberine field. Compound 26 has been found in Berberis empetrifolia (82TL39). Isomerizations such as that of 23 into 24 and 25 into 26 need catalysis, since tautomeric forms of this type are stable and do not equilibrate in solution. The transformation of 25 to 26 reflects a general rule stating that five-membered hydroxylactams are more stable than six-membered isomers (85MI1). B. PROTONATION YIELDING 4-AZAAZULENIUM SALTS The 4-azaazulenium cation 27a should be stable and aromatic.

Cient. Tecnol. (Univ. Tee. Esrado, Santiago) 10(1), 47 (1980) [ C A 94, 1314201. K. B. Yatsimirskii, M. I. Kabachnik, E. I. Sinyavskaya, T. Y. Medved, Y. M. Polikarpov, B. P. Shcherbakov, and L. V. Zagorovskaya, Zh. Neorg. Khim. 25(8), 2213 (1980). ] 80TL1449 80ZOB476 80ZOB2809 8 1DIS(B) I89 I 8 11ZV1539 8 1JOC5373 81M11 81PS147 8 1PS207 8 1 PS255 8 1 PS269 81TL229 81 USP212298 8 1ZOB1434 81ZOB I481 82BBR1467 82IC543 821ZV127 821ZV2723 82IZV2730 82JOC4637 82MI1 82PS105 82URP888498 82ZN(B)965 82ZOB789 82ZOB930 82ZOB I099 T H E CHEMISTRY OF AZAPHOSPHORINES 33 J.

Pudovik, Zh. Ohshch. Khim. 52(4) 789 (1982). N. K. Maidanovich, S. V. Iksanova, and Y. G. Gololobov, Zh. Obshch. Khim. 52(4), 930 (1982). N. I. Demidova, A. 1. Bokanov, 0. S. Medvedev, and B. I. Stepanov, Zh. Obshch. Khim. 52(5), 1099 (1982). 34 82ZOB2172 82ZOB2465 83AJC2095 83CJC427 831ZV418 83IZV432 831ZV1379 83PAC409 83PS73 84AJC205 84AJC1631 84A P I053 84CC200 84CZ402 84JBC 136I 84M11 84PS159 84US P4433149 85IZV1296 8SMI1 DAVID HEWITT [Refs. A. Y. Platonov, T. N. Timofeeva, I. G. Trotskyanskaya, E.

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