Ethyl ketone → 6,6-Diethyl-fulvene
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[CH:1]1[CH2:5][CH:4]=[CH:3][CH:2]=1.[CH2:6]([C:8]([CH2:10][CH3:11])=O)[CH3:7].N1CCCC1>CO.CCOCC.O>[CH2:6]([C:8]([CH2:10][CH3:11])=[C:2]1[CH:1]=[CH:5][CH:4]=[CH:3]1)[CH3:7][CH:1]1[CH2:5][CH:4]=[CH:3][CH:2]=1.[CH2:6]([C:8]([CH2:10][CH3:11])=O)[CH3:7].N1CCCC1>CO.CCOCC.O>[CH2:6]([C:8]([CH2:10][CH3:11])=[C:2]1[CH:1]=[CH:5][CH:4]=[CH:3]1)[CH3:7]To a solution of 22.00 g (332.8 mmol) of cyclopentadiene in 35 ml of methanol, 36.0 ml (665.1 mmol) of diethyl ketone and 28.0 ml (335.5 mmol) of pyrrolidine were added with ice cooling, followed by stirring at room temperature for one night. After the reaction solution was diluted with 200 ml of ether, 100 ml of water was added. The organic phase was separated, washed with water and a saturated saline solution, then dried over anhydrous magnesium sulfate and filtered. From the filtrate, the solvent was removed under reduced pressure to obtain a liquid. The liquid was subjected to vacuum distillation (78-83° C./4 mmHg) to obtain 36.50 g (271.94 mmol) of a yellow liquid (yield: 82%). The analyzed values are given below.
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