... The intrinsic lability of derivatives 5 may be partially ascribed to the proneness of the P(V) dibenzyl groups towards nucleophilic ... 628 Papers Table 1. Relevant Data of Methylthiomethyl Acetals 1 SYNTHESIS Prod- Yield 'H NMR (CDC13) “C NMRb uct” (%) 5, J (Hz) 6 B' = T ...