Etude Structurale de Bisalcoxy et de Dialcoxyetains Derives de l'Ethyleneglycol et du Pyridinedimethanol-2,6. Mise en Evidence d'une Forme Stannatrane pour un Stannadioxocanne Pyridinique

Article abstract of DOI:10.1016/0022-328X(86)80448-X

119Sn NMR is a good medium for determining the coordination number of tin atoms and association phenomena involved.By this technique the structures of three monomeric linear-bis-alkoxy-tin(IV) (R3SnO-A-OSnR3) derivatives of ethyleneglycol and pyridine-2,6-dimethanol have been determined (R= n-Bu, Ph).In the case of cyclic dialkyltins the ethyleneglycol derivative shows a variable temperature Sn^V dimeric<*> Sn^IV monomeric equilibrium (ΔH 64 kJ mol^-1), while the pyridinylstannadioxocane contains a Sn^V stannatrane as determined by its 1H, 13C and 119Sn NMR and mass spectra, and by cryogenic measurements.The pyridinylstannadioxocane is the only known stannatrane containing a pyridinic nitrogen atom.