US PATENT SUBCLASS 549 / 314
.~.~.~.~.~.~ At least two additional chalcogens 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}
295  DF  .~.~.~.~ The lactone ring is five-membered {10}
313  DF  .~.~.~.~.~ Additional chalcogen bonded directly to the lactone ring {3}
314.~.~.~.~.~.~ At least two additional chalcogens bonded directly to the lactone ring {1}
315  DF  .~.~.~.~.~.~.~> Double bond between ring members of the lactone ring or chalcogen double bonded directly at the 3- or 4-position of the lactone ring (e.g., ascorbic acid, etc.) {2}

DEFINITION

Classification: 549/314

(under subclass 313) Compounds wherein two or more additional chalcogens (i.e., oxygen, sulfur, selenium, or tellurium) are bonded directly to the lactone ring.

(1) Note. Compounds classified herein have at least three 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]