US PATENT SUBCLASS 549 / 315
.~.~.~.~.~.~.~ 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.)

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  DF  .~.~.~.~.~.~ At least two additional chalcogens bonded directly to the lactone ring {1}
315.~.~.~.~.~.~.~ 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}
316  DF  .~.~.~.~.~.~.~>.~ Amine addition salts
317  DF  .~.~.~.~.~.~.~>.~ Sulfur or -C(=X)-, wherein X is chalcogen, bonded directly to acyclic chalcogen

DEFINITION

Classification: 549/315

(under subclass 314) Compounds wherein there is a double bond between ring members of the lactone ring, or chalcogen (i, e., oxygen, sulfur, selenium, or tellurium) is double bonded directly at the 3- or 4- position of the lactone ring.

(1) Note. Example of compounds provided for herein are: [figure] [figure]

(2) Note. The two compounds of (1) Note, supra, are related by keto-enol tautomerism.