INVESTIGATIONS ON DIASTEREOISOMERIC TETRAORGANOTIN COMPOUNDS - THE USE OF SN-119 NMR-SPECTROSCOPY FOR THE DIRECT DETERMINATION OF THE DIASTEREOISOMERIC COMPOSITION

The distinction of enantiomeric alkyl halides by conversion in non-ass ociating diastereoisomeric tetraorganostannanes of the type R(2)Sn R'( 2) (R = Ph, Bu and R' = 2-octyl, 2-butyl, but-3-en-2-yl, 2-methylbutyl ) using Sn-119 NMR spectroscopy is described. An 119Sn ''inverse gated decoupling'' technique makes the direct quantitative analysis of the diastereoisomeric composition feasible. C-13 NMR data are reported and a diastereotopic non-equivalence of the R groups in the meso-derivati ves of R(2)SnR'(2) is described. Achiral diorganotin dichlorides were used as derivatizing agents.