US PATENT SUBCLASS 546 / 255
.~.~.~ Plural pyridine or partially hydrogenated pyridine rings

Current as of: June, 1999
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546 /   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 consisting of one nitrogen and five carbons {24}
255.~.~.~ Plural pyridine or partially hydrogenated pyridine rings {6}
256  DF  .~.~.~.~> Additional hetero ring containing
257  DF  .~.~.~.~> Pyridine or partially hydrogenated pyridine rings are bonded directly to each other {2}
261  DF  .~.~.~.~> Chalcogen bonded directly to ring carbon of pyridine or partially hydrogenated pyridine ring
262  DF  .~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to pyridine or partially hydrogenated pyridine ring {1}
264  DF  .~.~.~.~> Acyclic nitrogen attached directly or indirectly to pyridine or partially hydrogenated pyridine ring by nonionic bonding {1}
266  DF  .~.~.~.~> Chalcogen attached indirectly to pyridine or partially hydrogenated pyridine ring by nonionic bonding {1}

DEFINITION

Classification: 546/255

Plural pyridine or partially hydrogenated pyridine rings:

(under subclass 1) Compounds which contain at least two of the six-membered hetero rings, each consisting of one nitrogen and five carbons and having at least one double bond between ring members, i.e., pyridine or partially hydrogenated pyridine rings.

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