Monoindenyl titanium alkyl halides. The synthesis and molecular structures of (eta(5)-C9H7)TiBr3, (eta(5)-C9H7)Ti(CH3)Br-2, and (eta(5)-C9H7)Ti(CH3)Cl-2

The monoindenyl titanium tribromide (eta(5)-C9H7)TiBr3 (1), has been prepared from the interaction of TiBr4 and Bu3Sn-C9H7. The monomethyl species (eta(5)-C9H7)Ti(CH3)Br-2 (2), and (eta(5)-C9H7)Ti(CH3)Cl-2 (3), have been efficiently prepared from the interaction of the trihalides with AlMe3. Complexes 1 and 2 represent rare examples of organotitanium bromides, and all three compounds are likely to be of interest in the context of homogeneous olefin polymerization catalysis. All three complexes have been characterized by H-1 and C-13 NMR spectroscopy and single crystal X-ray crystallography. These analyses reveal that the indenyl complexes exhibit a three-legged piano stool geometry in which the indenyl ligands are bound to the metal centers in an eta(5) fashion. Crystal data for 1: (T = 103 K), molecular formula, C9H7TiBr3, crystal system: monoclinic, space group P2(1)/n, with a = 7.155(1), b = 12.682(1), c = 12.216(1) Angstrom, beta = 97.92 degrees, V = 1097.97 Angstrom(3), Z = 4; 2: (T = 103 K), molecular formula, C10H10TiBr2, crystal system: triclinic, space group P (1) over bar, with a = 7.142(1), b = 12.501(1), c = 7.117(1) Angstrom, alpha = 105.70(1), beta = 115.81(1), gamma = 88.21(1)degrees, V = 547.91 Angstrom(3), Z = 2; 3. (T = 110 K), molecular formula, C10H10TiCl2, crystal system: orthorhombic, space group Pcab, with a = 11.539(3), b = 12.593(3), c = 14.327(4) Angstrom, V = 2081.84 Angstrom(3), Z = 8. (C) 1999 Elsevier Science S.A. All rights reserved.