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US 2003/0199714 A1Published application
Process for preparing 2,5-dimethoxy benzaldehyde
AssigneeEastman Chemical Company
InventorsThomas Elbert Shanks, Robert Joseph Maleski
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Abstract
The present invention recites a process for the of 2,5-dimethoxy-benzaldehyde by reacting a 2-hydroxy-5 methoxy-benzaldehyde with a suitable metal hydroxide in the presence of a suitable solvent to make a metal salt of 2-hydroxy-5-methoxy benzaldehyde comprising. The invention further provides a method for alkylating said metal salts with dimethylsulfate in the presence of a suitable solvent so as to provide a 2,5-dimethoxy benzaldehyde.
Claims19
A process for preparing 2,5-dimethoxy benzaldehyde comprising the steps of:
- (a) reacting 2-hydroxy-5-methoxy benzaldehyde with a metal hydroxide to produce a reaction mixture comprising a metal salt of 2-hydroxy-5-methoxy benzaldehyde;
- (b) separating the metal salt of 2-hydroxy-5-methoxy benzaldehyde from the reaction mixture of step (a) to obtain an at least substantially pure metal salt of 2-hydroxy-5-methoxy benzaldehyde;
- and
- (c) alkylating the at least substantially pure metal salt of 2-hydroxy-5-methoxy benzaldehyde from step (b) with dimethylsulfate to produce 2,5-dimethoxy benzaldehyde.
1 more element
A process for preparing 2,5-dimethoxy benzaldehyde comprising the steps of:
- (a) reacting a 4-methoxy phenol, or a metal salt thereof, with formaldehyde or paraformaldehyde to form a crude reaction product comprising 2-hydroxy-5-methoxy benzaldehyde;
- (b) reacting the crude 2-hydroxy-5-methoxy benzaldehyde product from step (a) with a metal hydroxide to produce a reaction mixture comprising a metal salt of 2-hydroxy-5-methoxy benzaldehyde;
- (c) separating the metal salt of 2-hydroxy-5-methoxy benzaldehyde from the reaction mixture of step (b) to obtain an at least substantially pure metal salt of 2-hydroxy-5-methoxy benzaldehyde;
- and
- (d) alkylating the at least substantially pure metal salt of 2-hydroxy-5-methoxy benzaldehyde from step (c) with dimethylsulfate to produce 2,5-dimethoxy benzaldehyde.
2 more elements
Dependencies are inferred from the claim text.