Nucleophilic reactions of heterylsilanes and heterylgermanes (review)

We generalize data on the reactivity of furyl-, dihydrofuryl-, tetrahydrofuryl-, dihydropyranyl-, and tetrahydropyranylsilanes and -germanes in reactions with nucleophilic reagents. We show that upon reaction of heterosilanes and heterogermanes with O-, N-, C-, and H-nucleophiles, sequential substitution of the heterocycles occurs at the nucleophilic group. We consider the rearrangement of (2-tetrahydrofuryl)- and (2-tetrahydropyranyl) hydrosilanes with ring expansion, and also rearrangement of linear acyloxymethyl- and halomethylhydrosilanes to the corresponding acyloxy- and halosilanes.