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7.8-Dighenyl-glykoluril-2.5-bis-n-butylimid  (  Vb) : Ein  Gemisch von  16.0  g  (45  mMol) S.S- Dimethyl-7.8-diphenyI-2.5-dithioglykolwil~),  15.5  ccrn  (197  mMol) n-Butylamin,  5.8 ccrn (89  mMol) Essiglure  und  600  ccm  n-Butanol  wird 24 Stdn.  am  RiickfluBkiihler erhitzt. Nach etwa  1  Stde. wird  das  Gemisch  homogen, und  der  Geruch des  Methylmercaptans macht  sich bemerkbar.  Die  gelbe Lbsung  wird i.  Vak. vom grbDten Teil des Lbsungsmittels befreit, der  blige braune Riickstand  unter  gelindem Erwtirmen  in  70  ccm  Methanol gelbst
und rnit etwa demselben Volum  10-proz. methanol. Kalilauge behandelt, wonach beim Anreiben  die Abscheidung eines  weiBen Pulvers beginnt und  nach einiger Zeit durch  Versetzen mit 60 ccrn Wasser vervollsthdigt wird. Ausb. etwa  8 g  (44%). Schmp. 235-236'  (unkorr.,  aus Dimethylformamid).

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