Rotational barriers in 2-dimethylamino-1,3,4-oxadiazoles and -thiadiazoles. A CNDO/2 study
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 11,p. 1500-1505
- https://doi.org/10.1039/p29730001500
Abstract
The barriers to rotation of the dimethylamino-group in a series of 5-substituted 2-dimethylamino-1,3,4-oxadiazoles and -thiadiazoles have been calculated by the CNDO/2 method with and without d-orbitals in the basis set for sulphur. When a planar dimethylamino-nitrogen atom is employed, the experimental barriers are very satisfactorily reproduced, but when allowance is made for a pyramidal nitrogen atom, quite unrealistic results are obtained. The effects of d-orbitals and of pyramidalisation are analysed and discussed.Keywords
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