Trapping the tetrahedral intermediate in the 1,3-shift of an acetyl group using a triisopropylsilyl group

Attempted silylation of(2RS,3RS,4RS)-3-hydroxy-2,4-dimethylhexyl acetate 3 gave neither the primary nor the secondary silyl ether, but the stercoisomeric silyl ethers 9 and 10 of the tetrahedral intermediate in the 1,3-transfer of the acetyl group).