Journal of the Chemical Society. Perkin transactions II p. 407 - 411 (1980)
Update date:2022-08-11
Topics:
Casiraghi, Giovanni
Casnati, Giuseppe
Sartori, Giovanni
Zanafredi, Girolamo T.
In aprotic, apolar solvents tin(IV) ethoxide has been proved to be an efficient catalyst for the selective hydride transfer from alcohols to carbonyl compounds.Primary, secondary, and benzyl alcohols have shown hydride-donating ability, and this ability decreases in the order benzyl<*>secondary<*>primary.The mechanism of hydride transfer from 1-phenylethanol to cyclohexanone has been investigated.Catalysis is inferred to proceed in the following order: (a) alcoholysis of Sn(IV)ethoxide to form a mixed metal alkoxide, (b) co-ordination of the acceptor to the metal, (c) direct hydride transfer from the alkoxide moiety to the co-ordinated carbonyl compound and loss of the active catalyst.The kinetic isotope effetc measurements and other data suggest that step (c) is the rate-determining step of the reaction.
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