US PATENT SUBCLASS 549 / 395
.~.~.~.~.~.~ Acyclic chalcogen bonded directly to 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}
356  DF  .~.~.~ The hetero ring is six-membered {9}
381  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {4}
385  DF  .~.~.~.~.~ Tricyclo ring system having the hetero ring as one of the cyclos {4}
395.~.~.~.~.~.~ Acyclic chalcogen bonded directly to the hetero ring

DEFINITION

Classification: 549/395

(under subclass 385) Compounds in which acyclic chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is bonded directly to the hetero ring of the tricyclo ring system.

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