3-Cyclopentene-1-acetaldehyde, 2,2,3-trimethyl- → 2,2,3-Trimethylcyclopentaneacetaldehyde

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Reaction Steps

510 g of 2-(2,2,3-trimethylcyclopent-3-en-1-yl) acetaldehyde at 85% (2.85 moles) were hydrogenated with 20 g of 5% Pd on carbon (50% wet) with 10 g of soda ash at 60 psi and 50°-60° C. The crude product was distilled from 22 g of boric anhydride affording 324 g of purified product, containing pinocamphone as a 10-15% impurity. BP 48° C./0.6 mmHg; 1H-NMR (300 MHz), δ 0.54 (3H, s), 0.87 (3H, d, J=6.6 Hz), 0.88 (3H, s), 1.1-1.4 (2H, m), 2.25 (1H, m), 2.50 (1H, m), 2.55 (1H, m), 2.70-2.95 (3H, br m), 9.76 (1H, br s); 13C-NMR (75 MHz), δ 14.01, 14.73, 25.54, 28.34, 30.35, 42.62, 44.84, 45.03, 45.75, 203.83; IR (Neat), 2980, 2720, 1730, 1470, 1390, 1370 cm-1 ; MS (m/e), 139 (M+ -15), 97, 69 (Base).

Provenance & Evidence