US PATENT SUBCLASS 549 / 66
.~.~.~.~.~ 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}
62  DF  .~.~.~.~ Chalcogen bonded directly to ring carbon of the hetero ring {5}
66.~.~.~.~.~ Chalcogen attached indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/66

(under subclass 62) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached indirectly to the hetero ring by nonionic bonding.

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