Ozone → Benzenepropanal, .beta.-methyl-3-(1-methylethenyl)-

Participants

Reaction Steps

m-Diisopropenylbenzene (237 g), 0.2 g butylated hydroxytoluene, 0.1 g NaHCO3, 0.0918 g RhHCO(PPh3)3 and 20 g triphenylphosphine were heated under a pressure of 250 psi hydrogen and 250 psi carbon monoxide at 110° C. for five hours and then at 140° C. for six hours. The crude reaction product was distilled to give 215 g of a liquid which analyzed as 49.4% starting material, 40.8% lb, 1.9% 2-(3-propen-ylphenyl)-2-methylpropanal and 4.9% 1,3-di-(1-formylpropan-2-yl)benzene. The constituents were readily separated by fractional distillation to give pure lb, b.p 98° C./0.1 mm Hg. The starting material may be recycled to give further product in an overall yield of 71.0% lb. IR and NMR spectra were compatible with the assigned structure. Odor: ozone, stemmy-green floral, melon. Odor value: 35,514; Odor threshold value: 0.7 ng/L.

Provenance & Evidence