C CHEMISTRY; METALLURGY
C07 ORGANIC CHEMISTRY
C07F ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
C07F9/00 Compounds containing elements of Groups 5 or 15 of the Periodic Table
C07F9/02 Phosphorus compounds
C07F9/28 with one or more P—C bonds
C07F9/38 Phosphonic acids [RP(=O)(OH)2]; Thiophosphonic acids; ; [RP(=X1)(X2H)2(X1, X2 are each independently O, S or Se)]