US PATENT SUBCLASS 549 / 317
.~.~.~.~.~.~.~.~ Sulfur or -C(=X)-, wherein X is chalcogen, bonded directly to acyclic chalcogen

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  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}
317.~.~.~.~.~.~.~.~ Sulfur or -C(=X)-, wherein X is chalcogen, bonded directly to acyclic chalcogen

DEFINITION

Classification: 549/317

(under subclass 315) Compounds in which sulfur or a -- group, wherein X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium), is bonded directly to a cyclic chalcogen.

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