US PATENT SUBCLASS 549 / 308
.~.~.~.~.~.~.~.~ Two carbocyclic rings bonded directly to the same ring atom of 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}
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}
307  DF  .~.~.~.~.~.~.~ The other cyclo of the bicyclo ring system is benzene (e.g., phthalides, etc.) {2}
308.~.~.~.~.~.~.~.~ Two carbocyclic rings bonded directly to the same ring atom of the lactone ring {1}
309  DF  .~.~.~.~.~.~.~>.~.~ Nitrogen bonded directly to each of the carbocyclic rings

DEFINITION

Classification: 549/308

(under subclass 307) Compounds wherein two carbocyclic rings are bonded directly to the same ring atom of the lactone ring of the bicyclo ring system.

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

[figure]