The crystal structure of 3-(9-anthracenyl)-1,5-diphenyl-verdazyl, a stable free radical
摘要:
The crystal structure of the stable free radical 3-(9-anthracenyl)-1,5-diphenylverdazyl was determined. There are four independent molecules in the unit cell (space group <(P)over bar 1>). The structure was solved by direct methods. A large number of sets of inital random phases were generated in space group P1 (Z = 8, 256 non-hydrogen atoms) and the best solution gave the location of 250 atoms. The four symmetry-independent molecules have a variety of different conformations indicating considerable conformational freedom. (C) 1998 Elsevier Science B.V. All rights reserved.
Synthesis of Tetrahydropyridazines by a Metal-Carbene-Directed Enantioselective Vinylogous NH Insertion/Lewis Acid-Catalyzed Diastereoselective Mannich Addition
作者:Xinfang Xu、Peter Y. Zavalij、Michael P. Doyle
DOI:10.1002/anie.201203962
日期:2012.9.24
A versatile cascade of reactions, triggered by RhII‐catalyzed diazo decomposition followed by a vinylogous NH insertion/Lewisacidcatalyzed Mannich addition, that produces highly substituted 1,2,3,6‐tetrahydropyridazines in up to 97 % ee with high yield and diastereocontrol has been developed.
Condensation of several arylhydrazones with chlorocarbonyl phenyl ketene gave 2-(arylmethylidene)-5-oxo-1,4-diphenyl-2,5-dihydro-1H-pyrazol-2-ium-3-olates in high yields.
ROBEV, S. K.;TZANOVA, TZ. M.;DICHEVA, M. A., DOKL. BOLG. AN, 42,(1989) N2, S. 51-54
作者:ROBEV, S. K.、TZANOVA, TZ. M.、DICHEVA, M. A.
DOI:——
日期:——
78. Studies on hydrogen cyanide. Part VII. Aldehydes from aromatic hydrocarbons
作者:L. E. Hinkel、E. E. Ayling、J. H. Beynon
DOI:10.1039/jr9360000339
日期:——
The crystal structure of 3-(9-anthracenyl)-1,5-diphenyl-verdazyl, a stable free radical
作者:László Párkányi、Csaba Kertész、Armin J. Mayr、Michael P. Eastman
DOI:10.1016/s0022-2860(98)00326-3
日期:1998.6
The crystal structure of the stable free radical 3-(9-anthracenyl)-1,5-diphenylverdazyl was determined. There are four independent molecules in the unit cell (space group <(P)over bar 1>). The structure was solved by direct methods. A large number of sets of inital random phases were generated in space group P1 (Z = 8, 256 non-hydrogen atoms) and the best solution gave the location of 250 atoms. The four symmetry-independent molecules have a variety of different conformations indicating considerable conformational freedom. (C) 1998 Elsevier Science B.V. All rights reserved.