反应详情

A mixture of 0.6 g of 5% palladium on carbon, 44.1 g (0.15 moles of the pent-3-en-2-ol) of the above pentenol/pentanol mixture and 50 ml of ethanol was hydrogenated at 25°-45° C and 35-52 psi until hydrogen uptake ceased. The mixture was filtered to remove the catalyst and the solvent was removed from the filtrate by distillation. The residual oil was fractionally distilled to yield 5-(2,2,3-trimethylcyclopent-3-en-1-yl)-pentan-2-ol 30.1 g (77.7% yield); bp 105-108° C (1.5 mm); mol wt. 196 (ms); ir, 3350 (s, broad), 3040 and 797 cm-1 ; nmr, 0.5δ, 0.8, 0.9 and 1.0 (6H, 4s, geminal dimethyl groups of various diastereomers in the mixture), 1.2 (3H, d, J~6 Hz, carbinol methyl), 1.3-1.5 (7H, broad complex), 1.6 (3H, broad s, olefinic methyl), 1.7-2.4 (3H, broad complex containing 1H exchangeable with D2O), 3.8 (1H, broad multiplet, carbinyl H), 5.2 (1H, broad multiplet, olefinic H).

1. customwas hydrogenated at 25°-45° C
2. filtrationThe mixture was filtered
3. customto remove the catalyst
4. customthe solvent was removed from the filtrate by distillation
5. distillationThe residual oil was fractionally distilled