Description: 987 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 / 987 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) phosphorus compounds (9/02; 9/06) (33) compound contains a ring which is devoid of a metal atom and contains at least one p atom as ring member (9/6564; 9/6564v; 9/6568; 9/6568b; 9/6568c; 9/6568d; 9/6568e; 9/6568f) (37) ring contains o and p only, or may include in addition to the required o and p, only c (9/6571) (39) ring contains a p(o) group as atoms within the ring and wherein all atoms bonded to the p atom within the ring, or extracyclic to the ring, are oxygen (9/6574; 9/6574a1) (40) two or more rings contain at least one p(o) group and wherein at least two p atoms in the two rings are bonded solely to o, or wherein the compound contains two p atoms in a single ring and all bonds of the p atoms are to o (includes spiro rings) (9/6574a6)
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