Water → Benzenepropanal, alpha,alpha,3-trimethyl-

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A pre-mix of 23.3 g of NaOH, 2.5 g of tetrabutylammonium iodide, 107 ml of water, 25 ml of toluene and 9 ml of tetrahydrofuran under argon was heated to 70° C. A mixture of 70 g (0.5 moles) of 3-methylbenzyl chloride and 50.4 g (0.7 moles) of isobutyraldehyde was added dropwise to this pre-mix within a period of 2 hours while stirring vigorously. The reaction mixture was then maintained at a temperature of 75° C. for 3 hours. After separating the phases and removing the solvents, 66.5 g of end product were obtained by fractional distillation at 0.12 mbar in a temperature range of from 50° C. to 52° C.

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