Synthesis and reactivity of organotin compounds containing the C,P-chelating o-carboranylphosphino ligand [o-C2B10H10PPh2-C,P](Cab(C,P)). X-ray structures of (Cab(C,CH2P))SnMe2Br, [(Cab(C,P))SnMe2](2)Pd, and [(Cab(C,P))SnMe2]Pd(PEt3)Cl

The triorganotin halides (Cab(C,P))SnMe2X (2a, X = Cl; 2b, X = Br) and a-te traorganotin compound (Cab(C,P))SnMe3 (7), containing the o-carboranylphosp hino ligand (Cab(C,P)), have been prepared by the reaction of LiCab(C,P) (1 ) with Me2SnX2 and Me3SnCl, respectively. H-1, C-13, P-31, and Sn-119 NMR s pectroscopy indicate that the tin centers in 2a and 2b are pentacoordinate as a result of intramolecular Sn-P coordination, whereas the tin center in 7 is tetracoordinate. The substitution reactions of 2a using NaI, NaN3, NaC pFe(CO)(2), and NaB(CN)H-3 afforded the substituted products (Cab(C,P))SnMe 2X (3, X = I; 4, X = N-3; 5, X = CpFe(CO)(2); 6, X = H). The Wurtz-type cou pling reaction-of 2a with sodium afforded the distannane. The reaction of t he distannane 10 with Pd-2(dba)(3). CHCl3 afforded the bis(stannyl)-palladi um complex 11. When compounds 2a and 2b were employed in the reaction with Pd-2(dba)(3), the halo-bridged metal complexes 12a and 12b were isolated. T he crystal structures of 9b, 11, and 13 were determined by X-ray structural studies. As a result of the Sn-P interaction, the tin atom in 9b exhibits a distorted trigonal-bipyramidal configuration.