US PATENT SUBCLASS 549 / 75
.~.~.~.~.~ Chalcogen attached indirectly to the hetero ring by nonionic bonding

Current as of: June, 1999
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549 /   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) {2}
1  DF  .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9}
29  DF  .~.~.~ The hetero ring is five-membered {13}
74  DF  .~.~.~.~ Nitrogen attached indirectly to the hetero ring by nonionic bonding {1}
75.~.~.~.~.~ Chalcogen attached indirectly to the hetero ring by nonionic bonding {1}
76  DF  .~.~.~.~.~.~> The chalcogen, X, is in a -C(=X)- group {1}

DEFINITION

Classification: 549/75

(under subclass 74) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached indirectly to the hetero ring by nonionic bonding.

(1) Note. An example of a compound provided for herein is: [figure]