Dérivés Alléniques de l'Étain, du Plomb et du Mercure. Signes Relatifs des Constantes de Couplage Métal‐Proton á Travers Deux et Quatre Liaisons

Les spectres de Derives alleniques du plomb, de l'etain et du mercure permettent d'observer les satellites dus aux couplages metal-proton a travers deux et quatre liaisons. L'analyse de ces satellites montre que 2J(XH) et 4J(XH) sont de signes contraires pour X = 207Pb, 119Sn, 117Sn et de meme signe pour X = 199Hg. Les signes absolus probables des constantes de couplage reduites sont discutes en fonction des resultats de la litterature: 2K(XCH) est tres probablement positif pour X = 207Pb, 119Sn, 117Sn et 199Hg. 4K(XCCCH) est probablement negatif pour X = 207Pb, 119Sn, 117Sn, et positif pour X = 199Hg. Satellites corresponding to metal-proton coupling constants through two and four bonds are observed in PMR spectra of Pb, Sn and Hg allenic derivatives. The relative signs of these coupling constants are deduced from analysis of the satellite spectra: 2J(XH) and 4J(XH) are of opposite signs for X = 207Pb, 119Sn, 117Sn and of same sign for X = 199Hg. Probable absolute signs of reduced coupling constants are discussed in relation to published data: 2K(XCH) is probably positive for X = 207Pb, 119Sn, 117Sn and 199Hg. 4K(XCCCH) is probably negative for X = 207Pb, 119Sn, 117Sn and positive for X = 199Hg.

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