Method for the conversion of 3- and 4-methylcatechol to benzald

Details Method for the conversion of 3- and 4-methylcatechol to benzald Method for the conversion of 3- and 4-methylcatechol to benzald

1998-07-30

2000-01-11

Kumar, Shailendra

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568649, 568651, 570191, C07C 4543

Patent

active

060138416

ABSTRACT:
The 3- and 4-methylcatechols are converted to the corresponding benzaldehyde by first alkylating the hydroxyl groups to form an alkylated methylcatechol. The methyl group is then converted to a methyl dibromide group using 1,3-dibromo-5,5-dimethylhydantoin in the presence of a non-polar, non-reactive solvent such as carbon tetrachloride and heptane and a radical initiator having a ten hour half-life temperature in the range of 47.degree. to 55.degree. C. The dibromide is then hydrolyzed to form the aldehyde.

REFERENCES:
patent: 4145494 (1979-03-01), Neubert
patent: 4335263 (1982-06-01), Minai
patent: 4709100 (1987-11-01), Hermolin et al.
Hill et al, J.Chem.Soc. Perkin Trans. 1, pp. 2209-2215, 1987.

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