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The rate of allylation of aldehydes using a combination of allyltrichlorosilane and O-donor ligands can be profoundly accelerated by the addition of a range of simple tetra-n-butylammonium salts. Measured t 12 values decrease from over 6 hours under defined conditions to less than 5 minutes in favourable cases. These effects are highly relevant to the development of a catalytic asymmetric...