US PATENT SUBCLASS 544 / 223
.~.~.~.~.~.~.~.~ To two ring carbons

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}
180  DF  .~.~.~ Triazines {11}
215  DF  .~.~.~.~ Chalcogen or halogen containing substituent {1}
216  DF  .~.~.~.~.~ Bonded to triazine ring carbon {2}
219  DF  .~.~.~.~.~.~ Chalcogen bonded directly to triazine ring carbon {1}
220  DF  .~.~.~.~.~.~.~ Divalent chalcogen double bonded directly to triazine ring carbon {2}
223.~.~.~.~.~.~.~.~ To two ring carbons

DEFINITION

Classification: 544/223

(under subclass 200) Compounds wherein divalent chalcogen (i.e., oxygen, sulfur, selenium or tellurium) is double bonded directly to two of the ring carbons of the six-membered hetero ring.

(1) Note. This subclass provides for compounds such as the two illustrated below: [figure]