US PATENT SUBCLASS 549 / 70
.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring

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}
70.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring {3}
71  DF  .~.~.~.~.~> The -C(=X)- is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens
72  DF  .~.~.~.~.~> Nitrogen or chalcogen attached indirectly to the hetero ring by nonionic bonding
73  DF  .~.~.~.~.~> Halogen attached directly or indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/70

(under subclass 29) Compounds wherein --, in which X is chalcogen, (i.e., oxygen, sulfur, selenium, or tellurium), is bonded directly to the hetero ring.