US PATENT SUBCLASS 549 / 263
.~.~.~ Lactones (i.e., -C(=X)O-, wherein X is chalcogen, is part of the hetero 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.~.~.~ Lactones (i.e., -C(=X)O-, wherein X is chalcogen, is part of the hetero ring) {6}
264  DF  .~.~.~.~> Spiro {1}
266  DF  .~.~.~.~> The lactone ring has at least seven members {4}
273  DF  .~.~.~.~> The lactone ring is six-membered {6}
295  DF  .~.~.~.~> The lactone ring is five-membered {10}
327  DF  .~.~.~.~> Acyclic carbon double bonded directly to a ring carbon of a four-membered lactone ring
328  DF  .~.~.~.~> Four-membered lactone ring formed {1}

DEFINITION

Classification: 549/263

(under subclass 200) Compounds wherein the hetero ring is a lactone, i.e., a cyclic inner ester, wherein --O- is part of the ring, X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium).

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