Optical resolution of alltrans-2,3,4,5-tetramethylcyclo-pentanone and determination of the configuration of the laevorotatory enantiomer
摘要:
alltrans-2,3,4,5-Tetramethylcyclopentanone 4 is reduced to the corresponding alcohol 5. The optical resolution of 5 was carried out by using the phthalate halfester method. The configuration of (-)-4 is determined by CD. The possibility of the application as a chiral auxiliary is demonstrated.
Optical resolution of alltrans-2,3,4,5-tetramethylcyclo-pentanone and determination of the configuration of the laevorotatory enantiomer
摘要:
alltrans-2,3,4,5-Tetramethylcyclopentanone 4 is reduced to the corresponding alcohol 5. The optical resolution of 5 was carried out by using the phthalate halfester method. The configuration of (-)-4 is determined by CD. The possibility of the application as a chiral auxiliary is demonstrated.
A study of the stereochemical factors involved in multistep 1,2-hydride transfers
作者:Ted S. Sorensen、Steven M. Whitworth
DOI:10.1021/ja00174a029
日期:1990.8
all-trans-1,2,3,4,5-pentamethylcyclopentyl cation have been developed. These cations both undergo very rapid multiple 1,2-hydrideshifts, but the rate of this process is about 40 times faster in the all-trans case. This implies that the stereochemistry of the penultimate hydride in the rearrangement cascade can affect the rate of a given 1,2-hydrideshift, i.e. that it is better if this penultimate