Synthesis and reactions of some cyclohexadienones. Part II
作者:J. R. Merchant、V. B. Desai
DOI:10.1039/j39680000499
日期:——
The synthesis of 4-alkyl-4-trihalogenomethylcyclohexa-2,5-dienone derivatives by the application of the Zincke–Suhl reaction on p-alkyl-phenols is described. In some cases, only benzophenone derivatives were obtained. When the dienones were treated with reagents like phosphorus pentachloride and sulphuric acid, migration of the groups from the gem-C-atom occurred giving rise to halogenated benzoic
Irradiation of 4-tribromomethyl-4-methyl-2,5-cyclohexadienone in the presence of amines gave 4-bromo-5-methyltropone as a major product. On the basis of the results obtained, the mechanism involving single electron transfer from the amine ground state to the dienone excited state was proposed.
Reductive transformation of α,β-epoxy ketones and other compounds promoted through photoinduced electron transfer processes with 1,3-dimethyl-2-phenylbenzimidazoline (DMPBI)
Photoreactions of epoxy ketones, aromatic ketones, haloketones, and aromatic halides with 1,3-dimethyl-2-phenylbenzimidazoline (DMPBI) were studied Photoinduced single-electron transfer from DMPBI to such substrates initiates the reactions followed by radical radical rearrangement and reduction to finally give several reduced products in modest to good yields. (C) 1999 Elsevier Science Ltd. All rights reserved.
Reaction of 4-methyl-4-tribromomethylcyclohexa-2,5-dien-1-one with zinc metal
作者:G. V. Gavrilova、A. A. Gavrilov、K. P. Butin
DOI:10.1007/bf02495530
日期:1998.1
4-Methyl-4-tribromomethylcyclohexa-2,5-diene-1-one reacts with zinc dust in absolute DMF to give a mixture of 4-bromo-5-methylcyclohepta-2,4,6-trien-1-one, 4-methylcyclohepta-2,4,6-trien-1-one, and 4-dibromomethyl-4-methylcyclohexa-2,5-dien-1-one.
416. Synthesis and reactions of some cyclohexadienones