[Mg].Cl[CH:3]1[CH2:7][CH2:6][CH:5]=[CH:4]1.[CH:8](=[O:14])[C:9]1[O:13][CH:12]=[CH:11][CH:10]=1.[Cl-].[NH4+]>O1CCCC1>[C:5]1([C:9]2([CH2:8][OH:14])[CH2:10][CH:11]=[CH:12][O:13]2)[CH2:6][CH2:7][CH2:3][CH:4]=1Magnesium (36 g, 1.5 mole) and tetrahydrofuran (THF) (300 ml) were added to a reactor, and a solution of 3-chloro-1-cyclopentene (184.5 g, 1.8 mole) in THF (200 ml) was added dropwise at 0° to 10° C. to prepare a Grignard reagent. Thereafter, to this THF solution of the Grignard reagent was added dropwise a solution of furfural (106 g, 1.1 mole) in THF (150 ml) at 0° to 10° C. over about 1 hour, followed by stirring at 20° C. for further 2 hours. After completion of the reaction, the reaction solution was poured into an aqueous ammonium chloride solution (about 1 liter), followed by extraction with ether. The extract was washed with water, dried and concentrated. The residue obtained was distilled under reduced pressure to obtain 135 g (yield, 75%) of pure 2-cyclopentenyl-2-furyl methanol having a boiling point of 80°-86° C./3 mmHg.
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