[CH3:1][O:2][C:3]1[C:10]([O:11][CH2:12][O:13][CH3:14])=[CH:9][C:8]([O:15][CH3:16])=[C:7]([O:17][CH2:18][O:19][CH3:20])[C:4]=1[CH:5]=O.[CH3:21][C:22]1([CH3:30])[O:29][C:27](=[O:28])[CH2:26][C:24](=[O:25])[O:23]1.C(N(CC)CC)C.C(OCC)(=O)C>C1C=CC=CC=1>[CH3:21][C:22]1([CH3:30])[O:29][C:27](=[O:28])[C:26](=[CH:5][C:4]2[C:7]([O:17][CH2:18][O:19][CH3:20])=[C:8]([O:15][CH3:16])[CH:9]=[C:10]([O:11][CH2:12][O:13][CH3:14])[C:3]=2[O:2][CH3:1])[C:24](=[O:25])[O:23]13 Grams (10.48 mM) of 2,5-dimethoxy-3,6-bis(methoxymethoxy)benzaldehyde was dissolved in 100 ml of benzene, next 1.82 g (1.2 times the equivalent) of Meldrum's acid and 3 ml of triethylamine were added thereto, and the reaction mixture was stirred at room temperature for 5 hours. 200 milliliters of ethyl acetate was added to the reaction mixture, and the organic layer was washed twice with 50 ml of water, then washed three times with a saturated sodium chloride aqueous solution. The organic layer was then dehydrated on anhydrous sodium sulfate and concentrated to yield 4.39 g of 1-(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-ylidene)-1-[2,5-dimethoxy-3,6-bis(methoxymethoxy)phenyl]methane. Yellow powdery substance.
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