Per - bicyclophosphoranylation d'alditols

Reaction of bicyclophosphane 1 with glycol 2, glycerol 3, erythritol 4, L(-)arabitol 5 and dulcitol 6 leads to the corresponding per-alkoxybicyclophosphoranes 2p - 6p which are in tautomeric equilibrium with the phosphates forms 2p′ - 6p′.The amount of these latters increases regularly from traces to 24%.