Class 514/456 - Bicyclo ring system having the hetero ring as one of the cyclos (e.g., chromones, etc.)

Subclass of Class 514 - Drug, bio-affecting and body treating compositions
Definition: Subject matter wherein the polycyclo ring system consists
No. of patents: 1488
Last issue date: 05/22/2012

Number	Title	Issue Date
3952104	Benzopyran-2-carboxylic acids in the prevention of asthmatic symptoms There are described certain mono-chromone-2-carboxylic acids of formula, ##SPC1## Having one substituent in the 5 or 6 position or having 2 or more substituents in the 5,6,7 or 8 positions. There are also described processes for making the compounds and p...	04/20/1976
3937837	Substituted chromone-3-carbonitriles, carboxamides and carboxylic acids useful for preventing asthmatic symptoms Substituted chromone-3-carbonitriles, carboxamides and carboxylic acids having the structural formula: ##SPC1## Wherein R1 represents hydrogen, halogen, lower alkyl, hydroxy, lower alkoxy, or acyloxy; R2 represents hydrogen, lower al...	02/10/1976
3936563	Hydroxymethylene-substituted chromone-3-carboxaldehydes, process for their preparation and intermediates produced thereby Novel (hydroxymethylene) chromone derivatives of the general formula I: ##SPC1## wherein n represents 1 or 2, are prepared by reacting a cycloalkanone II with a boron trifluoride compound and acetic anhydride to obtain novel boron complex intermediates of...	02/03/1976

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