US PATENT SUBCLASS 546 / 25
.~.~.~.~.~ The phosphorus is bonded directly to the chalcogen

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546 /   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 consisting of one nitrogen and five carbons {24}
22  DF  .~.~.~ Phosphorus attached indirectly to the six-membered hetero ring by nonionic bonding {2}
24  DF  .~.~.~.~ Chalcogen bonded directly to ring carbon of the six-membered hetero ring {1}
25.~.~.~.~.~ The phosphorus is bonded directly to the chalcogen

DEFINITION

Classification: 546/25

The phosphorus is bonded directly to the chalcogen:

(under subclass 24) Compounds in which the phosphorus is bonded directly to the chalcogen (i.e., oxygen, sulfur, selenium, or tellurium).

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