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New PDF release: Advances in Heterocyclic Chemistry, Vol. 35

By Alan R. Katritzky

ISBN-10: 0120206358

ISBN-13: 9780120206353

Chapters of this quantity care for heavily comparable tricyclic heteromatic structures. The final complete evaluate of the dibenzofurans seemed in 1951; the topic is now up to date via Sargent and Stransky. Carbazoles have additionally now not been comprehensively reviewed lately; this has been performed during this quantity by way of Joule.The chemistry of 4-membered jewelry containing one sulfur atom — the thietanes and their derivatives — is roofed via Ried and Heinz, who replace prior surveys that seemed approximately twenty years ago.The bipyridines, of substantial commercial and theoretical curiosity, are comprehensively reviewed for the 1st time by way of Summers.Two chapters, facing 2H- and 4H- imidazoles by means of Sammes and the sequence editor, proceed and finish the sequence on nonaromatic azoles, which integrated contributions on 2H- and 3H- pyrroles (in quantity 33) and on 3Н- and 4H- pyrazoles (in quantity 34).Most of the chapters during this quantity conceal the literature up via 1982.

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WoMe MELVYN v. SARGENT AND PETER 0. STRANSKY 22 OMe Me0 \ OH I Me0 \ *-- J// Me (57) OH M OH e O Me HO Me HO w [Sec. B O M e OMe (58) OH Me Me has attempted to rationalize the reluctance of o-dihydroxyphenyl groups to participate in acid-catalyzed aromatic nucleophilic substitution in terms of molecular orbital calculations. Steric effects are sometimes important in determining the direction of cyclization of 2,2'-biphenyldiols. '' On prolonged treatment with boiling hydrobromic acid, however, the biphenyldiol 58 yielded the dibenzofuran 59, isolated as its tetra-0-methyl ether, as the major product and none of the alternative symmetrical isomer 60.

The dechloro compound (104) has been synthesized from 99 by a H. Henecka, Chem. Ber. 81, 197 (1948). M. Gerecke. E. Kyburz, C. von Planta, and A. Chim. Acrn 45. 2241 (1962). 32 MELVYN v. STRANSKY [Sec. l2* 7-Methoxy-4,9-dimethyl-2-dibenzofuranol has also been synthesized by this method,20 except that palladized charcoal was used to dehydrogenate the intermediate tetrahydro-2-dibenzofuranone. J. MacMillan, T. P. C. Mulholland, A. W. Dawkins, and J. Ward, J. Chem. , 429 ( I 954). Sec. ’ 2 3 3. ’ to dibenzofuran by lithium aluminum hydride reduction and subsequent dehydrogenation, to 1-methyldibenzofuran by Grignard reaction and dehydrogenation, and to 1-dibenzofuranol by reaction with N-bromosuccinimide and subsequent dehydrobromination with pyridine.

Behmann, J . Heterocycl. Chrm. 15, 589 (1978). 136 J. Ashby, M. Ayad, and 0. Meth-Cohn, JCS Perkin I , 1744 (1974) 13' 42 MELVYN v. STRANSKY [Sec. D (155) ( 156) Ph ( 157) SCHEME Ph ( 158) (70%) 40 electrocyclization t o the isolated dibenzofuran. '^' When the mercury derivative 155 (Scheme 40) is heated with tetraphenylcyclopentadienone, the dehydrobenzofuran 156 that is produced is trapped, and the initial adduct 157 is decarbonylated, thereby producing 1,2,3,4-tetraphenyIdibenzofuran(158). 38 D.

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Advances in Heterocyclic Chemistry, Vol. 35 by Alan R. Katritzky

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