1,5-Sigmatropic formyl migration in 1,3-dimethylbenz[f]indene-1-carbaldehyde; evidence for product-like transition states
作者:David W. Jones、Robert J. Marmon
DOI:10.1039/p19900003271
日期:——
The title compound 1 has been prepared in an optically active form via a convenient seven-step sequence. The migratory ability of the formyl group allows the 1,5-shift 1 (arrows) involving disruption of naphthalene aromaticity to proceed with modest activation [DELTA-G double-ended dagger = 31.84 +/- 0.6 kcal mol-1 (145-degrees-C)]. Activation enthalpies for 1,5-formyl migration in 1, 3, 4 and 5 correlate well with changes in pi-electron energy in going from these compounds to their respective rearrangement products. Product-like transition states involving important cleavage of the bond between the migration origin and the formyl group are suggested for these rearrangements.
Reductive colorant for keratin fibres
申请人:Wella Aktiengesellschaft
公开号:EP1707187B1
公开(公告)日:2007-08-01
JONES D. W.; POMFRET A.; WIFE R. L., J. CHEM. SOC. CHEM. COMMUN., 1980, NO 10, 463-464
作者:JONES D. W.、 POMFRET A.、 WIFE R. L.
DOI:——
日期:——
JONES, DAVID W.;MARMON, ROBERT J., J. CHEM. SOC. PERKIN TRANS. PT 1,(1990) N2, C. 3271-3275
作者:JONES, DAVID W.、MARMON, ROBERT J.
DOI:——
日期:——
JONES, D. W.;POMFRET, A.;WIFE, R. L., J. CHEM. SOC. PERKIN TRANS., 1983, N 2, 459-465