Monoindenyl titanium alkyl halides. The synthesis and molecular structuresof (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 prepar ed from the interaction of TiBr4 and Bu3Sn-C9H7. The monomethyl species (et a(5)-C9H7)Ti(CH3)Br-2 (2), and (eta(5)-C9H7)Ti(CH3)Cl-2 (3), have been effi ciently prepared from the interaction of the trihalides with AlMe3. Complex es 1 and 2 represent rare examples of organotitanium bromides, and all thre e compounds are likely to be of interest in the context of homogeneous olef in polymerization catalysis. All three complexes have been characterized by H-1 and C-13 NMR spectroscopy and single crystal X-ray crystallography. Th ese 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 = 1097.9 7 Angstrom(3), Z = 4; 2: (T = 103 K), molecular formula, C10H10TiBr2, cryst al 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.