US PATENT SUBCLASS 546 / 21
.~.~.~ Phosphorus attached directly to the six-membered hetero ring by nonionic bonding

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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}
21.~.~.~ Phosphorus attached directly to the six-membered hetero ring by nonionic bonding

DEFINITION

Classification: 546/21

Phosphorus attached directly to the six-membered hetero ring by nonionic bonding:

(under subclass 1) Compounds wherein phosphorus is attached directly to the six-membered hetero ring by nonionic bonding.

(1) Note. An example of a compound provided for herein is: [figure]