[CH3:1][N:2]1[C:6]2[CH2:7][CH2:8][CH2:9][CH2:10][C:11](=[O:12])[C:5]=2[CH:4]=[N:3]1.[H-].[Na+].[CH:15](OCC)=[O:16]>C(O)C.O1CCCC1>[OH:16][CH:15]=[C:10]1[C:11](=[O:12])[C:5]2[CH:4]=[N:3][N:2]([CH3:1])[C:6]=2[CH2:7][CH2:8][CH2:9]1A mixture of 7 grams of 5,6,7,8-tetrahydro-1-methyl4(1H)-cycloheptapyrazolone, 2.3 grams of sodium hydride (97%), 12 ml of ethyl formate, 2 drops of ethanol and 100 ml of tetrahydrofuran was heated at reflux for 3 hours. The mixture was then cooled and partitioned between water and ether. The aqueous layer was washed once with ether and acidified to a pH of 5 with 1 N hydrochloric acid. The white precipitate which formed was separated by filtration and dried to give 5,6,7,8-tetrahydro-5-hydroxymethylene-1-methyl-4(1H)-cycloheptapyrazolone as a cream colored powder melting at about 133°-135° C.
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