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) (31) compound contains a ring which is devoid of a metal atom as ring member and wherein the ring contains at least one atom other than c, n, o, s, p, se, or te as a ring atom; e.g., boron, etc. (9/6596)
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