AB-INITIO STUDY ON THE STABILITY OF DIAMINOCARBENES

被引:136
|
作者
HEINEMANN, C [1 ]
THIEL, W [1 ]
机构
[1] UNIV ZURICH,INST ORGAN CHEM,CH-8057 ZURICH,SWITZERLAND
关键词
D O I
10.1016/0009-2614(93)E1360-S
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ab initio calculations at the SCF and correlated levels with triple-zeta doubly polarized basis sets are reported for several diaminocarbenes. Imidazol-2-ylidene, the prototype of the recently isolated stable carbenes, has a significantly higher singlet-triplet splitting than the saturated analogue imidazolin-2-ylidene, which is the origin of its greater thermodynamic stability towards dimerization. The investigated diaminocarbenes have barriers to 1,2-hydrogen shifts of more than 45 kcal/mol and are therefore kinetically stable in this respect.
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收藏
页码:11 / 16
页数:6
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