An Efficient Bismuth(III) Chloride-Catalyzed Synthesis of 1,1-Diarylalkenesvia Friedel–Crafts Reaction of Acyl Chloride or Vinyl Chloride with Arenes
作者:Hongbin Sun、Ruimao Hua、Songjie Chen、Yingwu Yin
DOI:10.1002/adsc.200606157
日期:2006.9
In the presence of catalytic amount of bismuth(III) chloride, the reactions of acyl chlorides or vinyl chlorides with arenes afforded 1,1-diarylalkenes in 25–82 % isolated yield. In the case of the reaction of acyl chlorides with arenes, the procedure includes an initial Friedel–Crafts acylation, subsequent formation of vinyl chlorides and final Friedel–Crafts-type vinylation of another arene molecule
A novel Friedel-Crafts reaction of hindered ketones
作者:Royston M. Roberts、Ahmed M. El-Khawaga、Sophon Roengsumran
DOI:10.1021/jo00191a026
日期:1984.8
Synthesis of sterically hindered aromatic dialdehydes
作者:A. P. Yakubov、D. V. Tsyganov、L. I. Belen'kii、M. M. Krayushkin
DOI:10.1007/bf00961271
日期:1991.7
A study was carried out on the formylation of a series of aromatic compounds containing two mesitylene or durene residues [dimesityl (I), dimesitylmethane (II), 1,2-dimesitylethane (III), 1,6-dimesitylhexane (IV), dimesityl sulfide (V), 1,1-dimesitylethylene (VI), 1,1-dimesityl-1-butene (VII), and didurylmethane (VIII)) by the action of dichloromethyl methyl ether (DCM) in the presence of AlCl3 and TiCl4. The corresponding dialdehydes are the major products. The formylation products when the reaction is carried out in the presence of AlCl3 in the case of (I) and (V) contain significant amounts of monoaldehydes, while partial cleavage of the substrates with the formation of products containing only one benzene ring is observed in the case of (II) and (VIII) in addition to formylation.
Ortho Methyl Group Effects in Cumyl Systems
作者:Jack W. Timberlake、Dawei Pan、Jane Murray、Branko S. Jursic、Tonghua Chen
DOI:10.1021/jo00121a057
日期:1995.8
In an attempt to evaluate the steric effect of ortho methyl groups on the stability of the cumyl radical, 2,2',4,4',6,6'-hexamethylazocumene (6) was synthesized and its rate of decomposition was measured. The fact that 6 decomposes 40 times faster than azocumene is attributed to a ground state steric effect. Calculations on the mesitylcumyl radical 1 and cation 2 show both systems to be substantially nonplanar with dihedral angles of 48 degrees and 35 degrees, respectively. Calculated charge distributions for cation 2 corroborate previously obtained NMR results which showed substantial loss of charge delocalization.(1)
YAKUBOV, A. P.;TSYGANOV, D. V.;BELENKIJ, L. I.;KRAYUSHKIN, M. M., IZV. AN CCCP. CEP. XIM.,(1991) N, S. 1700-1703
作者:YAKUBOV, A. P.、TSYGANOV, D. V.、BELENKIJ, L. I.、KRAYUSHKIN, M. M.