US PATENT SUBCLASS 549 / 33
.~.~.~.~.~.~.~ Chalcogen attached directly 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}
30  DF  .~.~.~.~ Plural ring hetero atoms in the hetero ring {4}
31  DF  .~.~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {1}
32  DF  .~.~.~.~.~.~ Bicyclo ring system having the hetero ring as one of the cyclos {1}
33.~.~.~.~.~.~.~ Chalcogen attached directly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/33

(under subclass 22) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached directly to the hetero ring by nonionic bonding.

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