Substituent Effects on Regioselectivity in the Photorearrangement of a Few Naphthobarrelenes 1
作者:Meledathu C Sajimon、Danaboyina Ramaiah、S Ajaya Kumar、Nigam P Rath、Manapurathu V George
DOI:10.1016/s0040-4020(00)00450-6
日期:2000.7
The photorearrangement of a few 9,10-disubstituted-naphthobarrelenes to the corresponding naphthosemibullvalenes has been examined. It was observed that the regioselectivity in these photoisomerizations depends on the relative stabilities of the diradical intermediates. AM1 semi-empirical calculations are in support of this view. Thermal transformation of the naphthosemibullvalenes gave the corresponding
Reactions of cupric halides with organic compounds—V
作者:S. Gibson、A.D. Mosnaim、D.C. Nonhebel、J.A. Russell
DOI:10.1016/s0040-4020(01)83252-x
日期:1969.1
9-Aryl-10-methylanthracenes undergo reaction with cupric halides to give the corresponding 9-aryl-10-halogenomethylanthracenes. 9-Ethyl- and 9-benzyl-10-methylanthracenes similarly undergo reaction at the Me group rather than at the Et or Bz groups to form the halogenomethyl compound. These results indicate that the 9-alkyl-10-anthrylmethyl radical is more stable than the radicals which would be formed
AuCl-Catalyzed [4+2] Benzannulation between <i>o</i>-Alkynyl(oxo)benzene and Benzyne
作者:Naoki Asao、Kenichiro Sato
DOI:10.1021/ol062268m
日期:2006.11.9
AuCl-catalyzed benzannulation of o-alkynyl(oxo)benzenes with benzenediazonium 2-carboxylate proceeds undermildconditions and a variety of anthracene derivatives, having a ketone group at the 9-position, are produced in good to high yields. The reaction proceeds most probably through the [4+2] cycloaddition between benzyne and benzopyrylium auric ate complex, which would be generated by the gold-induced electrophilic
Nojima,M. et al., Journal of the Chemical Society. Perkin transactions I, 1978, p. 488 - 495
作者:Nojima,M. et al.
DOI:——
日期:——
AuCl-catalyzed reaction of ortho-alkynyl(oxo)benzene with benzenediazonium 2-carboxylate as a synthetic method towards anthracene, triptycene, and phthalazine derivatives
The AuCl-catalyzed benzannulation of ortho-alkynylphenyl ketones with benzenediazonium 2-carboxylate proceeded efficiently at 40 degrees C in (CH2Cl)(2) and a variety of anthracene derivatives, having a ketone group at 9-position, were produced in good to high yields. On the other hand, the reaction of ortho-alkynylbenzaldehydes with benzenediazonium 2-carboxylate afforded triptycyl ketones. The reactions most probably proceed through the formation of a zwitterionic intermediate by the gold-induced electrophilic cyclization of ortho-alkynyl(oxo)benzenes, followed by the cycloaddition of benzyne. In contrast, when the above reaction was carried out at rt in 1,4-dioxane, phthalazine derivative was produced without the generation of benzyne. (c) 2007 Elsevier Ltd. All rights reserved.