[CH:1](=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:9]([O:15][CH2:16][CH3:17])(=[O:14])[CH2:10][C:11]([CH3:13])=[O:12].C(N(CC)CC)C>O1CCCC1.C(Cl)(Cl)(Cl)Cl.[Ti](Cl)(Cl)(Cl)Cl>[O:12]=[C:11]([CH:13]=[CH:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)[CH2:10][C:9]([O:15][CH2:16][CH3:17])=[O:14]To a cold (5°) solution of 0.015 moles of benzaldehyde and 0.015 moles of ethyl acetoacetate in 60 ml of tetrahydrofuran was added 0.060 mole of triethylamine. After the mixture was stirred for 5 minutes, a solution of 0.020 moles of titanium tetrachloride in 15 ml of carbon tetrachloride was added dropwise over 10 minutes. The reaction mixture was then stirred for 20 hours, after which the title product was isolated by the extraction and chromatography methods described in Example 1. The material prepared by this procedure was identical to that prepared by the method of Example 1, as indicated by the reverse phase chromatographic method described in Example 2.
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