US PATENT SUBCLASS 544 / 319
.~.~.~.~.~.~ At 4- or 6-position


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}
242  DF  .~.~.~.~ 1,3-diazines {10}
298  DF  .~.~.~.~.~ Chalcogen bonded directly to diazine ring carbon {4}
319.~.~.~.~.~.~ At 4- or 6-position {1}
320  DF  .~.~.~.~.~.~.~> Nitrogen attached directly at 2-position by nonionic bonding {1}


DEFINITION

Classification: 544/319

At 4- or 6-position:

(under subclass 298) Compounds wherein the chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is bonded directly at the 4- or 6-position of the six-membered hetero ring.