反应详情

10 g (40 mmol) of 4-hydroxy-4-(5-hydroxy-3-methyl-3-penten-1-ynyl)-3,5,5-trimethyl-2-cyclohexen-1-one (prepared in accordance with Example 1) were dissolved in 200 ml of n-propanol/water (1:1, v/v) under argon in a 500 ml multi-necked flask provided with stirrer, thermometer, dropping funnel and gasification headpiece and treated with 20.9 g (0.32 g-atoms) of zinc powder. Thereupon, 120 ml (0.12 mol) of 1N sodium hydroxide solution were added dropwise thereto in 5 minutes at room temperature while stirring and the mixture was stirred for a further 1 hour. The resulting mixture was then worked-up in a manner analogous to that described in Example 1 and there were obtained 9.2 g of crude product. The purification on silica gel in a manner analogous to that described in Example 1 gave 6.9 g (74.3%) of 4-(5-hydroxy-3-methyl-1,2-pentadienyl)-3,5,5-trimethyl-2-cyclohexen-1-one in the form of an oil. The structure of this compound was characterized unequivocally by microanalysis, NMR, IR and MS spectra.

1. customv/v) under argon in a 500 ml multi-necked flask provided with stirrer
2. stirringthe mixture was stirred for a further 1 hour
3. customthere were obtained 9.2 g of crude product
4. customThe purification on silica gel in a manner analogous to