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The reaction of 1,1,1-tris(diiodoarsinomethyl)ethane, CH 3 C(CH 2 Asl 2 ) 3  (1) with NaAs(C 6 H 5 ) 2  in the molar ratio of 1:3 gives 4-methyl-1,2,6-triarsa-tricyclo[2,2,1,0 2,6 ]-heptane, CH 3 C(CH 2 As) 3  (2). The previously synthesized CH 3 C(CH 2 AsS) 3  (4) can be desulphurated with triphenylphosphine to yield also 2. The reaction of 1 with NaSeH gives the new cage compound 6-methyl-1,3,4-triarsa-2,8-diselena-tricyclo[3,3,1,0 3 ,4 ]-nonane, CH 3 C(CH 2 As) 3 Se 2  (5).

zeitschrift für naturforschung b

Chemie polyfunktioneller Liganden, 60 [1]. Über Käfigverbindungen mit den Heteroelementen Arsen und Selen / Chemistry of Polyfunctional Ligands, 60 [1]. On Cage Compounds with the Heteroelements Arsenic and Selenium