ISSN:
1573-935X
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract Analysis of the 13C, 29Si, and 31P NMR spectra in the series of C-bis(trimethylsilyl)phosphaalkenes made it possible to differentiate between the mechanisms of the electronic effects of the substituents R at the P atom on the π-system of the -P=C(SiMe3)2 group. It was established that substituents R capable of n (or π) conjugation (NMe2, OR, Hlg) substantially perturb the π-system, destabilizing the levels of the occupied MO of the P=C bond; substituents with poorly defined π-donating (accepting) characteristics (tert-Bu, iso-Pr, C≡N, Ph) only influence the investigated system through its polarization. Criteria which agree with the reactivity characteristics of the phosphaalkenes were obtained.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00531366
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