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The perchlorinated arsaboranes closo-1,2-As 2 B 10 Cl 10  and As 4 B 8 C 16  are formed in the co­ pyrolysis of B 2 C 14  and AsCl 3  at temperatures of 330-450°C. The icosahedral structure of closo-1,2-As 2 B 10 Cl 10  is confirmed by  11 B- 11 B-COSY-NMR spectroscopy. As 4 B 8 Cl 6  is suppo­ sed to be a conjuncto-borane (As 2 B 4 Cl 3 ) 2  with two boron-boron linked As 2 B 4 Cl 3  octahedra. The copyrolysis of B 2 Cl 4  andSbCl 3  or SbCl 5  yields Sb 2 B 10 Cl 10 , and the corresponding reaction of B 2 Cl 4  with S 2 Cl 2  gives the icosahedral thiaborane cluster SB 11 Cl 11  .

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Zwölfgliedrige Heteroborancluster durch Copyrolyse von Tetrachlordiboran(4) mit Elementhalogeniden/ Twelve-Vertex Heteroborane Clusters by Copyrolysis of Tetrachlorodiborane(4) and Element Halides