Substitution of the acetoxy groups of dialkoxymethylacetates by organometallic reagents: a route to allyl-, propargyl-, homoallyl-, homopropargyl- and α-stannylacetals
The substitution of the acetoxy groups of dialkoxymethylacetates by organometallicreagents has been examined in a search for new methods of preparing functional acetals. The efficiency of the substitution of the acetoxy group is highly dependent on the nature of the organometallicreagents: soft nucleophiles with strong electrophilic assistance by the counterion are the best reagents. Allyl-, propargyl-
Titanation of alkynyltin acetals has been exploited to obtain the corresponding (Z)-disubstituted vinyltins and γ-hydroxy trisubstituted vinyltins, as a single geometrical isomer.