US PATENT SUBCLASS 549 / 243
.~.~.~.~.~.~.~ Nitrogen or additional chalcogen bonded directly to the bicyclo ring system


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}
231  DF  .~.~.~ Cyclic anhydrides (i.e., -C(=X)OC(=X)-, wherein the X's are the same or diverse chalcogens, is part of the hetero ring) {2}
233  DF  .~.~.~.~ The cyclic anhydride is five-membered (e.g., succinic anhydride, etc.) {7}
234  DF  .~.~.~.~.~ Polycyclo ring system having the cyclic anhydride as one of the cyclos {3}
240  DF  .~.~.~.~.~.~ Bicyclo ring system having the cyclic anhydride as one of the cyclos {5}
243.~.~.~.~.~.~.~ Nitrogen or additional chalcogen bonded directly to the bicyclo ring system


DEFINITION

Classification: 549/243

(under subclass 240) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or nitrogen is bonded directly to the bicyclo ring system.

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