US PATENT SUBCLASS 548 / 317.1
.~.~.~.~.~ Plural chalcogens bonded directly to ring carbons of the diazole 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}
300.1  DF  .~.~.~ 1,3-diazoles (including hydrogenated) {9}
316.4  DF  .~.~.~.~ Chalcogen bonded directly to ring carbon of the diazole ring (e.g., N-vinyl-N, N'ethylene urea, etc.) {9}
317.1.~.~.~.~.~ Plural chalcogens bonded directly to ring carbons of the diazole ring {7}
317.5  DF  .~.~.~.~.~.~> Three chalcogens bonded directly to ring carbons of the diazole ring
318.1  DF  .~.~.~.~.~.~> Nitrogen attached directly to the diazole ring by nonionic bonding [e.g., (2,5-dioxo-4-imidazolidinyl)urea or allantoin, etc.]
318.5  DF  .~.~.~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the diazole ring
319.1  DF  .~.~.~.~.~.~> Chalcogen attached indirectly to the diazole ring by acyclic nonionic bonding {1}
320.1  DF  .~.~.~.~.~.~> Nitrogen attached indirectly to the diazole ring by acyclic nonionic bonding
320.5  DF  .~.~.~.~.~.~> Halogen attached directly or indirectly to the diazole ring by acyclic nonionic bonding
321.1  DF  .~.~.~.~.~.~> Benzene ring bonded directly to the diazole ring


DEFINITION

Classification: 548/317.1

(under subclass 316.4) Compounds wherein at least two chalcogens (i.e., oxygen, sulfur, selenium, or tellurium) are bonded directly to ring carbons of the diazole ring.

(1) Note. This subclass contains, for example: [figure]

(2) Note. Included in this subclass are compounds which have been commonly called hydantoins (i.e., 2,4-imidazolidinedione).