Document Type and Number:
Japanese Patent JPS4972259
Kind Code:
A
Abstract:
In the process for synthesizing benzopyrans, the improvement comprising condensing the appropriately substituted resorcinol and the appropriate beta -keto ester in the presence of methanesulfonic acid.
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Application Number:
JP11290273A
Publication Date:
July 12, 1974
Filing Date:
October 09, 1973
Export Citation:
International Classes:
C07C37/055; C07D311/80; C07D311/94; C07D491/04; C07D491/052; C07D491/18; C07D495/04; (IPC1-7): C07D7/26
Domestic Patent References:
| JP43021552A |