Annalen der Chemie. 501. Band. 2 H'ittig wad P e t v i , Um die Darstellung des 9, IO-Tet~aphenyZ-dih,ydrophenanthyens (111) haben sich bereits S c h l e n k und Brauns') vergeblich bemuht, da das Glykol (V) statt des gewiinschten Pichlorids m i t Salzsaure sofort das cyclische Anhydrid lieferte. Auch die Versuche von T s c h i t s c h i b a b i n und S s e r g e j e w 3 und spater S s e r g e j e w 3 ) blieben erfolglos, da das unter bestimmten Bedingungen entstehende Dibromid (V, Br anstatt OH) spontan in das 5-(DiphertyZ-trvom-mcthyZ)-9,9-di;ohe71yl-fZuorcn (BI, R = Br) ubergeht.
OH OHUnsere Bestrebungen gingen dahin, das Diradikal 11 auf dem Wege:
Fluorine was determined in the iliac crest bones of patients and in ribs collected from post-mortem investigations by particle-induced gamma-ray emission based on the 19F(p,p'gamma)19F reaction, using 2.0/2.5 MeV protons. The results indicate that for 68% of the human samples the F concentration is in the range 500-1999 microg g(-1). For comparison purposes fluorine was also determined in some animal bones; in some animal tissues lateral profiles of fluorine were measured.
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