US PATENT SUBCLASS 549 / 305
.~.~.~.~.~.~.~ Chalcogen attached indirectly to the lactone ring by acyclic nonionic bonding

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}
297  DF  .~.~.~.~.~ Polycyclo ring system having the lactone ring as one of the cyclos {3}
302  DF  .~.~.~.~.~.~ Bicyclo ring system having the lactone ring as one of the cyclos {6}
305.~.~.~.~.~.~.~ Chalcogen attached indirectly to the lactone ring by acyclic nonionic bonding

DEFINITION

Classification: 549/305

(under subclass 302) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached indirectly to the lactone ring of the bicyclo ring system by acyclic nonionic bonding.

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