Transmetallierung von Zinn(II) in [Sn(μ₃‐PSitBu₃)]₄ durch Barium – von Sn₄P₄‐Heterocuban‐Strukturen zu heterobinuklearen Käfigverbindungen mit einem zentralen BanSn4−nP₄‐Heterocuban‐Polyeder (n = 1, 2 und 3)

Transmetallation of Tin(II) in [Sn(μ 3 ‐PSi t Bu 3 )] 4 by Barium – from Sn 4 P 4 Heterocubane Structures to Heterobinuclear Cage Compounds with a Central Ba n Sn 4−n P 4 Heterocubane Polyhedron (n = 1, 2 and 3) For the preparation of compounds of the type [Ba n Sn 4−n (PSi t Bu 3 ) 4 ] (n = 1 ( 2 ), 2 ( 3 ) and 3 ( 4 )) two synthetic routes are applicable: in the transmetallation reaction homometallic [Sn 4 (PSi t Bu 3 ) 4 ] ( 1 ) reacts with barium metal and in a deprotonation reaction (metallation) tri(tert‐butyl)silylphosphane reacts simultaneously with (thf) 2 Ba[N(SiMe 3 ) 2 ] 2 and Sn[N(SiMe 3 ) 2 ] 2 . During the transmetallation reaction mixtures of the heterobimetallic cage compounds 2 to 4 are obtained, however, analytically pure compounds 2 and 3 are accessible by the metallation reaction. Compound 4 is formed as a minor product together with 3 . Due to the larger Ba‐P bond lengths compared to the Sn‐P values the substitution of tin by barium leads to strong distortions of the heterocubane moiety. With NMR‐spectroscopic experiments one could show that all the above mentioned compounds form Ba n Sn 4−n P 4 heterocubane cage structures.