US PATENT SUBCLASS 549 / 313
.~.~.~.~.~ 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}
295  DF  .~.~.~.~ The lactone ring is five-membered {10}
313.~.~.~.~.~ Additional chalcogen bonded directly to the lactone ring {3}
314  DF  .~.~.~.~.~.~> At least two additional chalcogens bonded directly to the lactone ring {1}
318  DF  .~.~.~.~.~.~> Acyclic -C(=X)-, wherein X is chalcogen, attached directly or indirectly to the lactone ring by nonionic bonding
319  DF  .~.~.~.~.~.~> Plural alkyl groups bonded directly to the same ring carbon of the lactone ring (e.g., pantolactone, etc.)


DEFINITION

Classification: 549/313

(under subclass 295) Compounds wherein an additional chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is bonded directly to the lactone ring.

(1) Note. The chalcogen required by this subclass is in addition to the double bonded oxygen of the --O- grouping of the lactone ring.

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