STERIC EFFECTS IN NEOPHILTIN(IV) CHEMISTRY

Article abstract of DOI:10.1016/0022-328X(85)87253-3

The stability and self-association in solution of (neophyl₃Sn)2O, neophyl₃SnOH, and (neophyl₃Sn)2CO3 (neophyl = C6H5(CH3)2CCH2) have been examined by 119Sn NMR.The presence of Sn,Sn spin coupling through oxygen (²J(119Sn,117Sn)) has been used to distinguish between the distannoxane and stannol.Facile dehydration prevents the isolation of neophyl₃SnOH from solution at room temperature and the equilibrium constant for H2O + (neophyl₃Sn)2O <*> 2neophyl₃SnOH is 0.3 at 304 K.These observations are in sharp contrast with a previous report that the sterically bulky neophyl ligands render neophyl₃SnOH stable toward dehydration. <*>¹J(119Sn,13C)<*> observed for neophyl₃SnOH and (neophyl₃Sn)2CO3 indicates that these compounds, unlike their n-alkyl-substituted homologues, are unassociated in solution, a result attributed to the steric bulk of the neophyl ligand.