US PATENT SUBCLASS 544 / 98
.~.~.~.~ 1,4-Oxazines


Current as of: June, 1999
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544 /   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 having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
63  DF  .~.~.~ Six-membered hetero ring consists of oxygen, nitrogen and carbon (e.g., 1,2-oxazines, etc) {8}
98.~.~.~.~ 1,4-Oxazines {2}
99  DF  .~.~.~.~.~> Polycyclo ring system having the oxazine ring as one of the cyclos {3}
106  DF  .~.~.~.~.~> Morpholines (i.e., fully hydrogenated 1,4-oxazines {10}


DEFINITION

Classification: 544/98

(under subclass 63) Compounds wherein the six-membered hetero ring has oxygen in the 1-position, nitrogen in the 4-position and carbons in the remaining four positions.