((BU2SNASH)-BU-T)(2) AND ((BU2SNASH)-BU-T )(3) - 2 NOVEL RING-OLIGOMERIC STANNYLARSINES

(Bu2SnCl2)-Bu-t reacts with NaAsH2 in liquid ammonia to give the four- membered As-H-functional stannylarsine ((Bu2SnAsH)-Bu-t)(2) (1). The o ligomeric six-membered heterocycle ((Bu2SnAsH)-Bu-t)(3) (2) is obtaine d by transamination of (Bu2Sn)-Bu-t((NHBu)-Bu-t)(2) with AsH3. The nov el compounds are characterized by NMR (H-1, Sn-119) and mass spectrosc opy and their molecule structures determined by X-ray crystallography. In the solid state both compounds contain molecules with planar tin-a rsenic rings (1: space group P2(1)/n, Z = 2; 2: space group P6(3)/m, Z = 2).