US PATENT SUBCLASS 544 / 353
.~.~.~.~.~.~.~ Quinoxalines (including hydrogenated)


Current as of: June, 1999
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544 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {1}
1  DF  .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
224  DF  .~.~.~ The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) {9}
336  DF  .~.~.~.~ 1,4-diazines {9}
338  DF  .~.~.~.~.~ Polycyclo ring system having the diazine ring as one of the cyclos {5}
349  DF  .~.~.~.~.~.~ Bicyclo ring system having the diazine ring as one of the cyclos {3}
353.~.~.~.~.~.~.~ Quinoxalines (including hydrogenated) {3}
354  DF  .~.~.~.~.~.~.~>.~ Chalcogen bonded directly to diazine ring carbon
355  DF  .~.~.~.~.~.~.~>.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to diazine ring carbon
356  DF  .~.~.~.~.~.~.~>.~ Halogen or nitrogen attached directly to diazine ring carbon by nonionic bonding


DEFINITION

Classification: 544/353

Quinoxalines (including hydrogenated):

(under subclass 349) Compounds wherein the bicyclo ring system has the following basic structure, illustrated below, in which the bonds between ring members may be single or double bonds. [figure]