[C:1]1([CH2:7][C:8]#[N:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[O-]CC.[Na+].C([O:16][C:17]([CH:19]1[CH:21]([CH:22]=O)[C:20]1([CH3:25])[CH3:24])=[O:18])C>C(O)C>[C:8]([C:7]([C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1)=[CH:22][C@H:21]1[C@H:19]([C:17]([OH:18])=[O:16])[C:20]1([CH3:25])[CH3:24])#[N:9]Phenylacetonitrile is added to a stirred solution of sodium ethoxide in absolute ethanol (prepared from 1.1 g sodium and 100 ml of ethanol). Next, a solution of 3-formyl-2,2-dimethyl-cyclopropanecarboxylic acid ethyl ester (8.5 g) in absolute ethanol (15 ml) is added over 5 minutes. The reaction mixture is stirred for 12 hours at room temperature and then heated on a steam bath for 0.5 hour. The alcohol is removed in vacuo, and the residue washed with water (250 ml) and ether (150 ml). The aqueous layer is acidified with concentrated hydrochloric acid. The resulting cream colored slurry is filtered and the isolated product dried. The product is dissolved in ether and precipitated with hexane to afford 6.1 g of white crystals, m.p. 186°-188° C.
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