US PATENT SUBCLASS 549 / 292
.~.~.~.~.~ Additional chalcogen bonded directly to the lactone 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}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
263  DF  .~.~.~ Lactones (i.e., -C(=X)O-, wherein X is chalcogen, is part of the hetero ring) {6}
273  DF  .~.~.~.~ The lactone ring is six-membered {6}
292.~.~.~.~.~ Additional chalcogen bonded directly to the lactone ring

DEFINITION

Classification: 549/292

(under subclass 273) Compounds wherein an additional chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is bonded directly to the lactone ring.

(1) Note. Compounds classified herein have at least two acyclic chalcogens bonded directly to the oxygen-containing hetero ring, one of which is the chalcogen of the lactone group which is double bonded directly to the ring.

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