US PATENT SUBCLASS 548 / 142
.~.~.~.~.~ Chalcogen bonded directly to the 2- and 5- positions of the thiadiazole ring

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}
100  DF  .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18}
125  DF  .~.~.~ The five-membered hetero ring consists of chalcogen, plural nitrogens, and carbon {7}
136  DF  .~.~.~.~ 1,3,4-thiadiazoles (including hydrogenated) {3}
142.~.~.~.~.~ Chalcogen bonded directly to the 2- and 5- positions of the thiadiazole ring

DEFINITION

Classification: 548/142

(under subclass 136) Compounds wherein chalcogen (i.e., oxygen, sulfur selenium, or tellurium) is bonded directly to each of the ring carbons of the thiadiazole ring, i.e., the 2- and 5-positions.

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