1 Mono(dinitrogen) and Carbon Monoxide Adducts of Bis(cyclopentadienyl) Titanium Sandwiches Tamara E. Hanna, Emil Lobkovsky, and Paul J. Chirik* J. Am. Chem. Soc. 2006, 128, 6018 - 6019

2 R = SiMe 2 Bu t J. Am. Chem. Soc. 1998, 120, 10264

3 J. Am. Chem. Soc. 2004, 126, 14688.

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5 Nature 2004, 427, 527.

6 1: R = SiMe 3 2: R = SiMe 2 Ph 3: R = CHMe 2

7 1: R = SiMe 3 2: R = SiMe 2 Ph 3: R = CHMe 2

8 1: R = SiMe 3 2: R = SiMe 2 Ph 3: R = CHMe 2

9 Ti(1) – N(1) : 2.016(1) Å N(1) – N(2) : 1.119(2) Å Ti(1) – N(1) : 2.043(1) Å N(1) – N(2) : 1.110(2) Å J. Am. Chem. Soc. 2004, 126, 14688.

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11 J. Am. Chem. Soc. 2000, 122, 6476.

12 1: R = SiMe 3 2: R = SiMe 2 Ph 3: R = CHMe 2

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14 Ti(1) – C(10) : 1.9786(19) Å C(10) – O(1) : 1.151(2) Å Ti(1) – C(13) : 2.0065(18) Å C(13) – O(1) : 1.150(2) Å

15 σ-donating, weakly π-acidic N2N2

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