VARIABLE-TEMPERATURE NMR AND X-RAY CRYSTALLOGRAPHIC STUDIES OF 5-DIMETHYLAMINOMETHYLENE, 5-DIMETHYLAMINOPROPENYLIDENE, AND 5-(5-DIMETHYLAMINOPENTA-2,4-DIENYLIDENE)-DERIVATIVES OF MELDRUMS ACID AND RELATED DIMETHYL MALONATE DERIVATIVES

被引：21

作者：

BLAKE, AJ ^{[1
]}

MCNAB, H ^{[1
]}

MONAHAN, LC ^{[1
]}

机构：

[1] UNIV EDINBURGH,DEPT CHEM,EDINBURGH EH9 3JJ,MIDLOTHIAN,SCOTLAND

来源：

JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 | 1991年 / 12期

关键词：

D O I：

10.1039/p29910002003

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Variable-temperature H-1 and C-13 NMR studies of the title Meldrum's acid derivatives and the corresponding malonates show in most cases coalescence phenomena due to C-N and C = C rotation effects. The trends in free energies of activation for these processes are examined with respect to the X-ray crystal structures of the Meldrum's acid derivatives which show effects of electron delocalisation in the conjugated system.

引用

页码：2003 / 2010

页数：8

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