Self-consistent perturbation theory calculations of nuclear spin coupling constants in thiophenes
โ Scribed by V. Galasso
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 198 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
The rmg proton-proton couplmg constants of thlophene and 14 monosubstltuted derrvatwes have been calculated usmg the perturbed SCF INDO method The results reproduce satlsfactorlly signs, magmtudes and some trends of the experunental values, but the mternal order of long-range constants In the 3-substltuteci thlophenes IS not rcfleeted
๐ SIMILAR VOLUMES
## Abstract Selfโconsistent perturbation calculations within the INDO framework are reported for 63 ^15^N๏ฃฟ^13^C coupling constants. Examples are presented for which each of the contact, orbital and dipolar terms provides the dominant contribution to the observed coupling constant. In general, good
## Abstract One bond ^13^C,^13^C coupling constants have been calculated for some methylcycloalkanes, as well as for 2โmethylbutane, using the selfโconsistent perturbation theory as formulated by Blizzard and Santry at the INDO (intermediate neglect of differential overlap) level of approximation.
Nuclear spm-spm couphng CO~SSIIUI~S xc calculakd wth lhc self-consWent polanzation prop~!s~or appro\nn~lron method stmtmg from a scmr-cmpmcJl nonsmglct unstable ~'avcfunct~on. IXccts on o and n rnnsmllrcd componcnrs arc scparatcly analyscd. Results show tht tins approum~tlon IS an adcquatc fraw%orl