- METHOD FOR PRODUCING BENZOPHENONE DERIVATIVE
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PROBLEM TO BE SOLVED: To provide a method for producing a benzophenone derivative low in rhodamine-type dye content and having asymmetric alkyl groups. SOLUTION: The method for producing the benzophenone derivative of the general formula(2) comprises the following process: A reaction is carried out between a compound of the general formula(1) and phthalic anhydride in the presence of an organic solvent, the resultant reaction liquid is charged with water to adjust the reaction liquid to pH4.0-7.0, an organic solvent layer obtained by separating the reaction liquid in two is charged with water to adjust the organic solvent layer to pH8.0-14.0, and an aqueous layer obtained by separating the organic solvent layer in two is mixed with a water-miscible organic solvent to deposit crystal, which is then separated by filtration. In the general formulas(1) and (2), R1 and R2 are each an alkyl, cycloalkyl, alkoxyalkyl, benzyl or (substituted) phenyl group, wherein R1 and R2 are not the same as each other. COPYRIGHT: (C)2006,JPOandNCIPI
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Page/Page column 6-7
(2008/06/13)
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- Production of keto acids
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A method for the production of a keto acid having the general formula STR1 wherein R1 and R2 independently represent a straight or branched chain alkyl of 1-18 carbon atoms, a cycloalkyl of 4-8 carbon atoms or a phenyl, each of which may be substituted by at least one substituent selected from the group consisting of halogen atoms and alkyls having 1-4 carbon atoms, an aralkyl of 7-10 carbon atoms, alkoxyalkyl having 2-20 carbon atoms, tetrahydrofuryl alkyl, alkylcarboxy alkyl, alkylcarboxy benzyl, or R1 and R2 together with the adjacent nitrogen atom may form a heterocyclic ring, or one of R1 and R2 is hydrogen, but R1 and R2 may not simultaneously be methyl or ethyl or benzyl which comprises reacting a m-amino phenol having the general formula STR2 wherein R1 and R2 are the same as above, with phthalic anhydride, in an organic solvent in an amount of less than 0.5 parts by weight per part of m-amino phenol.
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