US PATENT SUBCLASS 548 / 451
.~.~.~.~.~.~ Plural chalcogens bonded directly to ring carbons of the five-membered hetero ring (e.g., cyclic imides, naphthisatins, etc.)

Current as of: June, 1999
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548 /   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) {4}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
416  DF  .~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {5}
427  DF  .~.~.~.~ Tricyclo ring system having the five-membered hetero ring as one of the cyclos {6}
450  DF  .~.~.~.~.~ Chalcogen bonded directly to ring carbon of the five-membered hetero ring (e.g., indigoid dyes, etc.) {1}
451.~.~.~.~.~.~ Plural chalcogens bonded directly to ring carbons of the five-membered hetero ring (e.g., cyclic imides, naphthisatins, etc.)

DEFINITION

Classification: 548/451

(under subclass 450) Compounds wherein at least two chalcogens (i.e., oxygen, sulfur, selenium, or tellurium) are bonded directly to ring carbons of the five-membered hetero ring.

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