Process for preparing protocatechualdehyde

Details Process for preparing protocatechualdehyde Process for preparing protocatechualdehyde

1997-01-22

1997-12-09

Dees, Jose G.

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

Organic compounds

Oxygen containing

546434, 546436, C07C 3410, C07D30700, C07B31744

Patent

active

056963017

ABSTRACT:
Protocatechualdehyde is prepared by the steps of reacting piperonyl dichloride with molecular chlorine in the presence of phosphorus trichloride, phosphorus pentachloride or sulfuryl chloride to prepare dichloropiperonylidene dichloride and hydrolyzing the dichloropiperonylidene dichloride. The piperonyl dichloride can be prepared by the reaction of piperonal with thionyl chloride in the presence of dimethylformamide.

REFERENCES:
patent: 5420308 (1995-05-01), Andres
patent: 5525739 (1996-06-01), Andres
Schiess etal., Formation of Substituted Benzocyclobutenes through Flash Vacuum Pyrolysis, Tet. Lett., vol. 23, No. 36, pp. 3669-3672, 1982.
Bich et al., Synthesis of 3,4-dihydroxy-2-methoxybenzaldehyde: The Use of Methylenedioxy as a Protecting Group, Aust. J. Chem., vol. 22, No. 7, pp. 1563-1568, 1969.

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