Toluene → 2-Cyclohexene-1-carboxaldehyde, 2,6,6-trimethyl-

9.3 Ml of a 1.42N slution of butyl-lithium in hexane (0.0132M) were added dropwise at -78° to a solution of 2.0 g (0.011M) of methyl alpha-cyclogeranate in 40 ml of anhydrous tetrahydrofuran (THF). Once the addition was over, the temperature of the mixture was increased to +15° and, at this temperature, 3.17 ml (0.011M) of a 70% solution of VITRIDE [sodium bis(2-methoxyethoxy)aluminum hydride] in toluene were added thereto. The reaction mixture was heated to 40° for 45 mn, then hydrolyzed by pouring it onto an icy saturated aqueous solution of ammonium chloride. The mixture was extracted with ether, the organic phase was separated and then subjected to the usual treatments of neutralization and washing to give a residue which, upon distillation, gave 1.27 g of alpha-cyclocitral having b.p. 60°-65°/66 Pa (purity: 80%; yield: 65%).

1. additionOnce the addition
2. additionwere added
3. temperatureThe reaction mixture was heated to 40° for 45 mn
4. extractionThe mixture was extracted with ether
5. customthe organic phase was separated
6. washwashing
7. customto give a residue which
8. distillationupon distillation

ORD record

ord-fa194567bfb04831a5ed43149d250e46

Source dataset

uspto-grants-1989_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04868340