Liu Zuliang
2007
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Journal
Fine chemicals
Abstract
The alkylation and annulation reactions of methyl 3,5-dimethoxybenzoate with chloral hydrate produced 4,6-dimethoxy-7-trichloromethyl-phthalide.Then the obtained compound was hydrolyzed,decarboxylated,oxidized and dehydrated subsequently to synthesize 3,5-dimethoxyphthalic anhydride in total yield of 78%.The objective and intermediate compounds were characterized by IR,1HNMR and MS.The researches using title compound to synthesize substituted anthraquinones,hypericin and its derivatives are in operation.