Spectres infrarouge d'oxydes d'allénylphosphines XYP(O)CHCCR1R2. Isomerie de rotation. Influence des substituants X et Y sur le dedoublement des bandes d'absorption du système allénique
✍ Scribed by R. Mathis; F. Mathis; N. Ayed; B. Baccar; C. Charrier
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 566 KB
- Volume
- 39
- Category
- Article
- ISSN
- 1386-1425
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✦ Synopsis
Infrared spectroscopic
study of compounds XYP(O)CH=C=CR' R2 reveals the following facts: these compounds exhibit conformational isomerism, presumably arising from rotation about the P-C(allenic) bond; the C=C=C "antisymmetric" stretching vibration frequencies are different for both isomers, and the difference can be correlated with the crmetO Hammett constants of substituents X and Y; the influence of the allenic group on the P + 0 stretching frequency cannot be entirely accounted for by purely inductive effect; this suggests that the phosphorus atom is in some way conjugated with the allenic system. Tableau 1 Composes (C,H,),P(0)CH=C=CHZ (C,H,),P(0)CH=C=CHCH3 (C,H,),P(O)CH=C=C(CH& (C,H,0),P(0)CH=C=CH2 (CH,O)ZP(0)CH=C=CH, CI,P(0)CH=C=CHI CI,P(O)CH=C=CHCH, CI,P(O)CH=C=C(CH,), C,H,O(Cl)P(O)CH=C=CH, Composes CH,O(Cl)P(O)CH=C=CH, CH,O(Cl)P(O)CH=C=CHCH, CH,O(Cl)P(O)CH=C=C(CH,), C,H,0(CI)P(0)CH=C=CH2 CH,(CI)P(O)CH=C=CH, (HO),P(O)CH=C=CH, C,H,(HC=CCH,O)P(0)CH=C=CHZ (C,H,),P(O)CH=C ,CH, 'OCH,C=CH Cl,P(O)N=C=O No.