Reactions of the stannaborate salt [NBu4](2)[SnB11H11] (1) with the organom
etallic electrophiles [CpFe(CO)(2)Br], [(C7H7)Mo(CO)(2)I], and [CpNi(PPh3)C
l] resulted in substitution of the halide to give the stannaborate coordina
tion products [NBu4][CpFe(CO)(2)(SnB11H11)] (2), [NBu4][(C7H7)Mo(CO)(2)(SnB
11H11)] (3), and [NBu4][CpNi(PPh3)(SnB11H11)] (4) in high yields. Single cr
ystals of the air- and moisture-stable products have been characterized by
X-ray crystal structure analyses.