US PATENT SUBCLASS 549 / 285
.~.~.~.~.~.~.~ Additional acyclic 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}
275  DF  .~.~.~.~.~ Polycyclo ring system having the lactone ring as one of the cyclos {3}
283  DF  .~.~.~.~.~.~ Bicyclo ring system having the lactone ring as one of the cyclos {6}
285.~.~.~.~.~.~.~ Additional acyclic chalcogen bonded directly to the lactone ring {1}
286  DF  .~.~.~.~.~.~.~>.~ Benzene ring and the lactone ring bonded directly to the same acyclic carbon

DEFINITION

Classification: 549/285

(under subclass 283) Compounds wherein an additional acyclic chalcogen is bonded directly to the six-membered lactone ring.

(1) Note. Compounds classified herein have at least two acyclic chalcogens bonded directly to the lactone 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]