Cyclohexane → 1,2,3,4,4a,5,6,7,8,9a-Decahydrofluoren-9-one

温度

70 °C

In a 250 ml three neck round bottom flask, equipped with a mechanical stirrer, a thermometer and a reflux condenser 16.276 g of polyphosphoric acid was charged and heated to a temperature of 70° C. 16.276 g of 1-cyclohexenecarboxylic acid and 10.592 g of cyclohexane were added dropwise maintaining a temperature of the reaction mass below 100° C. The mixture was stirred at 78° C. for additional 4.5 hours. The dark brown reaction mass was was poured onto 237 g of ice and neutralised with 89 g aqueous ammonium sulphate solution in 474 g of water. The resulting mixture was then extracted 4 times with 300 ml of petroleum ether and 300 ml of diethyl ether. All organic layers were combined, washed successively with 5% aqueous ammonium hydroxide, brine dried over magnesium sulphate and concentrated in vacuum. Fractional distillation (b.p. 130° C. at 3.0 mmHg) of this crude product yielded 10.294 g of 1,2,3,4,4a,5,6,7,8,9a-decahydro-9H-fluoren-9-one. 1H-NMR (CDCl3): δ2.73 (q, J=7 Hz, 1H), 2.2-0.5 (m, 17H).

1. temperaturemaintaining a temperature of the reaction mass below 100° C
2. extractionThe resulting mixture was then extracted 4 times with 300 ml of petroleum ether and 300 ml of diethyl ether
3. washwashed successively with 5% aqueous ammonium hydroxide, brine
4. dry with materialdried over magnesium sulphate
5. concentrationconcentrated in vacuum
6. distillationFractional distillation (b.p. 130° C. at 3.0 mmHg) of this crude product

ORDレコード

ord-232a95ed0dcb4c9b9dbe117274e5938f

出典データセット

uspto-grants-2001_04

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US06211108B1