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) (209) pentavalent p containing the structure p-(x-c) wherein a s, se, or te is directly bonded to the p atom and wherein x is chalcogen (x may qualify as the required s, se, or te atom) (9/16; 9/165; 9/165a1) (215) containing the structure p-(x-ethylenic group) (9/173)
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