US PATENT SUBCLASS 987 / 79
.~.~.~.~.~ C atom of ring is directly bonded to a P atom (9/6512K; 9/6512K4)


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987 /   HD   ORGANIC COMPOUNDS CONTAINING A Bi, Sb, As, OR P ATOM OR CONTAINING A METAL ATOM OF THE 6TH TO 8TH GROUP OF THE PERIODIC SYSTEM

30  DF  PHOSPHORUS COMPOUNDS (9/02; 9/06) {15}
49  DF  .~ Ring is devoid of a P or a metal atom and contains at least one hereto atom (O, S, N, Se, or Te) and may or may not contain C (9/547; 9/6524) {9}
75  DF  .~.~ Exactly two N's as only hetero atom in ring (9/645) {2}
76  DF  .~.~.~ Six-membered ring containing two N and four C atoms (9/6509; 9/6509B2; 9/6509B2E; 9/6509B2G; 9/6509B2K; 9/6509B2R) {3}
77  DF  .~.~.~.~ N in 1 and 3 ring positions (9/6512; 9/6512E; 9/6512G; 9/6512R) {3}
79.~.~.~.~.~ C atom of ring is directly bonded to a P atom (9/6512K; 9/6512K4)


DEFINITION

Classification: 987/79

C atom of ring is directly bonded to a P atom (9/6512K; 9/6512K4):

(under subclass 77) Subject matter wherein at least one of the carbon atoms of the six-membered ring is bonded directly to an extracyclic phosphorus atom.