- A 2, 2 the [...] -dihydroxy-4-methoxy benzophenone synthetic method
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The invention provides a synthetic method of 2,2'-dyhydroxyl-4-methoxyl diphenyl ketone. The method comprises the following steps: (1) reacting m-benzene dimethylether with o-methoxybenzoyl chloride for 1-10 hours at the temperature of 0-80 DEG C under the irradiation of light having specific wavelength to obtain an intermediate product 2,2',4-triethoxy diphenyl ketone; (2) carrying out a selective demethylation reaction on the intermediate product 2,2',4-triethoxy diphenyl ketone obtained in the step (1) and a demethylating reagent for 5-16 hours at a reaction temperature of 40-120 DEG C and then performing water washing, liquid separation and recrystallization after the reaction ends to obtain 2,2'-dyhydroxyl-4-methoxyl diphenyl ketone (II). The method is low in reaction energy consumption, high in raw material recovery rate, simple in aftertreatment and small in environment pollution, so the method satisfies the development of environmental-friendly chemistry.
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Paragraph 0028-0030
(2017/01/12)
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- BeCl2 as a new highly selective reagent for dealkylation of aryl-methyl ethers
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An efficient and simple method is introduced for the selective removal of methyl group from poly aryl-methyl ethers, in some important derivatives of benzophenones, xanthones, anthraquinones, aryl esters, benzamides and nitroanisoles with BeCl2.
- Sharghi, Hashem,Tamaddon, Fatemeh
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p. 13623 - 13640
(2007/10/03)
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