US PATENT SUBCLASS 544 / 309
.~.~.~.~.~.~ At 2-position and 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}
309.~.~.~.~.~.~ At 2-position and at 4- or 6-position {4}
310  DF  .~.~.~.~.~.~.~> Additional hetero ring which is unsaturated
311  DF  .~.~.~.~.~.~.~> Nitrogen attached directly or indirectly to the diazine ring by nonionic bonding {1}
313  DF  .~.~.~.~.~.~.~> Halogen attached directly to the diazine ring by nonionic bonding
314  DF  .~.~.~.~.~.~.~> Additional chalcogen attached directly or indirectly to the diazine ring by nonionic bonding

DEFINITION

Classification: 544/309

At 2-position and a 4- or 6-position:

(under subclass 298) Compounds wherein chalcogens (i.e., oxygen, sulfur, selenium, or tellurium) are bonded directly to the 2-position and to the 4- or 6-position of the six-membered hetero ring.

(1) Note. Examples of compounds provided for herein are:

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