反应详情

温度

50 °C

In a 50 ml four necked flask equipped with a stirrer, thermometer, gas inlet, and a reflux condenser, under argon atmosphere 0.654 g (96.52%, 1 mmol) of solanesol were dissolved in 15 ml of n-hexane and mixed with 1.07 g (5.0 mmol) of 2,3,4,5-tetramethoxy-toluene (TMT) suspended in 7.6 ml of nitromethane. The catalyst, Sc(OTf)3 (2.5 mg, 0.005 mmol), was then added. The two-phase mixture was heated up to 50° C. (internal temperature) under stirring (400 rpm). After 16 hours reaction time the mixture was cooled down to room temperature (21° C.). The hexane layer was separated and washed two times with 4 ml (total 8 ml) of nitromethane. The hexane phase was evaporated and yielded 1.03 g of crude 1,2,3,4-tetramethoxy-5-methyl-6-((2E,6E,10E,14E,18E,22E,26E,30E)-3,7,11,15,19,23,27,31,35-nonamethyl-hexatriaconta-2,6,10,14,18,22,26,30,34-nonaenyl)-benzene (tetramethoxy-CoQ9) as a colorless oil, which was purified by column chromatography on 30 g silica (elution with n-hexane/ethyl acetate=99:1, v/v) yielding 280 mg of a colorless oil which crystallized upon standing. Yield:32%; purity 94%.

1. customAfter 16 hours reaction time the mixture
2. temperaturewas cooled down to room temperature (21° C.)
3. customThe hexane layer was separated
4. washwashed two times with 4 ml (total 8 ml) of nitromethane
5. customThe hexane phase was evaporated