US PATENT SUBCLASS 549 / 271
.~.~.~.~.~ Additional chalcogen attached directly or indirectly to the lactone 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}
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}
266  DF  .~.~.~.~ The lactone ring has at least seven members {4}
271.~.~.~.~.~ Additional chalcogen attached directly or indirectly to the lactone ring by nonionic bonding

DEFINITION

Classification: 549/271

(under subclass 266) Compounds wherein an additional chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached directly or indirectly to the lactone ring by nonionic bonding.

(1) Note. Compounds classified herein have at least two chalcogens bonded directly or indirectly to the lactone ring, one of which is the chalcogen of the lactone group which is double bonded directly to the ring.

(2) Note. Examples of compounds provided for herein are: [figure] [figure]