US PATENT SUBCLASS 548 / 240
.~.~.~ 1,2-oxazoles (including hydrogenated)

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}
240.~.~.~ 1,2-oxazoles (including hydrogenated) {4}
241  DF  .~.~.~.~> Polycyclo ring system having the oxazole ring as one of the cyclos {1}
243  DF  .~.~.~.~> Chalcogen bonded directly to ring carbon of the oxazole ring {1}
245  DF  .~.~.~.~> Nitrogen bonded directly to ring carbon of the oxazole ring {1}
247  DF  .~.~.~.~> Plural double bonds between ring members of the oxazole ring {2}

DEFINITION

Classification: 548/240

(under subclass 100) Compounds in which the five-membered hetero ring has oxygen in the 1 position, nitrogen in the 2-position, and carbons in the remaining three positions.

(1) Note. This subclass provided for compounds containing the following ring which may have a double bond between its members: [figure]