Structural Studies of Electron Deficient Titanacyclobutanes |
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| Authors: | Benjamin G Harvey Atta M Arif and Richard D Ernst |
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| Institution: | (1) Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake, UT 84112-0850, USA; |
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| Abstract: | Abstract Two 16 electron titanacyclobutanes of the formula Ti(C5H4R)2(μ2-CH2)2C(CH3)(i-C3H7) (R=H, CH3) have been prepared from the reaction of Ti(C5H5)2(μ2-CH2)(μ2-Cl)Al(CH3)2 or Ti(C5H4CH3)2(μ2-CH2)(μ2-Cl)Al(CH3)2 with H2C=C(CH3)(i-C3H7). Structural parameters, most notably lengthened C–C bonds in the titanacyclobutane ring, for both complexes reveal the expected
presence of (C–C)→Ti agostic interactions. The complexes are isomorphous, crystallizing in the monoclinic space group Cc. For Ti(C5H5)2(μ2-CH2)2C(CH3)(i-C3H7), a = 11.3459(3) ?, b = 16.2108(4) ?, c = 8.1646(2) ?, β = 105.5276(16)°, V = 1446.87(6)°, Dcalc = 1.268 at 150(1) K. For Ti(C5H4CH3)2(μ2-CH2)2C(CH3)(i-C3H7), a = 12.6591(2) ?, b = 16.2795(4) ?, c = 8.2462(2) ?, β = 107.2421(14)°, V = 1623.04(6) ?3, Dcalc = 1.245 at 150(1) K. |
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