Synthesis, crystal and molecular structure and dynamic behaviour of new dimethyldioxanedione based inherently dissymmetric overcrowded alkenes.

被引:7
作者
Huck, NPM [1 ]
Meetsma, A [1 ]
Zijlstra, R [1 ]
Feringa, BL [1 ]
机构
[1] UNIV GRONINGEN,GRONINGEN CTR CATALYSIS & SYNTH,DEPT ORGAN & MOLEC INORGAN CHEM,9747 AG GRONINGEN,NETHERLANDS
关键词
D O I
10.1016/0040-4039(95)01991-P
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Two representatives of new chiral sterically overcrowded ethylenes, 2-methyl(9-thioxanthylidene)-2,2-dimethyl- 1,3-dioxane-4,6-dione (3) and 12H-benzo[a]thioxanthylidene-2,2-dimethyl-1,3-dioxane-4,6-dione (5), have been prepared and dynamic H-1 NMR studies revealed 1 racemization barriers of 10.3 kcal mol(-1) (S) and 23.2 kcal mol(-1) (5).
引用
收藏
页码:9381 / 9384
页数:4
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