US PATENT SUBCLASS 546 / 83
.~.~.~.~.~.~.~.~ At least one of the ring hetero atoms is chalcogen

Current as of: June, 1999
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546 /   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) {1}
1  DF  .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24}
26  DF  .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {9}
79  DF  .~.~.~.~ Tricyclo ring system having the six-membered hetero ring as one of the cyclos {7}
80  DF  .~.~.~.~.~ Plural ring hetero atoms in the tricyclo ring system {2}
81  DF  .~.~.~.~.~.~ Plural ring nitrogens in the tricyclo ring system {3}
82  DF  .~.~.~.~.~.~.~ Three or more ring hetero atoms in the tricyclo ring system {1}
83.~.~.~.~.~.~.~.~ At least one of the ring hetero atoms is chalcogen

DEFINITION

Classification: 546/83

At least one of the ring hetero atoms is chalcogen:

(under subclass 92) Compounds wherein at least one of the additional ring hetero atoms is chalcogen (i.e., oxygen, sulfur, selenium, or tellurium).

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