US PATENT SUBCLASS 549 / 52
.~.~.~.~.~.~.~ Chalcogen attached directly to the hetero ring by nonionic bonding

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}
1  DF  .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9}
29  DF  .~.~.~ The hetero ring is five-membered {13}
41  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {3}
49  DF  .~.~.~.~.~ Bicyclo ring system having the hetero ring as one of the cyclos {4}
51  DF  .~.~.~.~.~.~ Chalcogen attached directly to the bicyclo ring system by nonionic bonding {1}
52.~.~.~.~.~.~.~ Chalcogen attached directly to the hetero ring by nonionic bonding {4}
53  DF  .~.~.~.~.~.~.~>.~ Chalcogen attached directly to ring sulfur of the hetero ring by nonionic bonding
54  DF  .~.~.~.~.~.~.~>.~ Plural chalcogens bonded directly to the bicyclo ring system
55  DF  .~.~.~.~.~.~.~>.~ Nitrogen attached directly or indirectly to the bicyclo ring system by nonionic bonding
56  DF  .~.~.~.~.~.~.~>.~ Halogen attached directly or indirectly to the bicyclo ring system by nonionic bonding

DEFINITION

Classification: 549/52

(under subclass 51) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached directly to the hetero ring by nonionic bonding.

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