US PATENT SUBCLASS 544 / 242
.~.~.~.~ 1,3-diazines


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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}
224  DF  .~.~.~ The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) {9}
242.~.~.~.~ 1,3-diazines {10}
243  DF  .~.~.~.~.~> Phosphorus attached directly or indirectly to the diazine ring by nonionic bonding {1}
245  DF  .~.~.~.~.~> Polycyclo ring system having the diazine ring as one of the cyclos {3}
294  DF  .~.~.~.~.~> Polycyclo-carbocyclic ring system having at least three cyclos
295  DF  .~.~.~.~.~> Plural diazine rings {1}
297  DF  .~.~.~.~.~> Nitrogen attached directly at 2-position by nonionic bonding and sulfur bonded directly to the nitrogen
298  DF  .~.~.~.~.~> Chalcogen bonded directly to diazine ring carbon {4}
322  DF  .~.~.~.~.~> Nitrogen attached directly to diazine ring by nonionic bonding {3}
333  DF  .~.~.~.~.~> Additional hetero ring which is unsaturated
334  DF  .~.~.~.~.~> Halogen attached directly to the diazine ring by nonionic bonding
335  DF  .~.~.~.~.~> Chalcogen attached indirectly to the diazine ring by nonionic bonding


DEFINITION

Classification: 544/242

1,3-diazines:

(under subclass 224) Compounds wherein the six-membered hetero ring has nitrogens in the 1- and 3-positions, and carbons in the remaining four positions.

(1) Note. The following shows the position numbering used for 1,3-diazines: [figure]