Synthesis,crystal structure and reaction of differentially ring-substituted titanocene dichlorides |
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Authors: | Qian Yanlong Li Guisheng Chen Weichun Li Bihua Jin Xianglin |
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Institution: | (1) Shanghai institute of Organic Chemistry, Academia Sinica, 345 Lingling Lu, 200032 Shanghai, PR China;(2) Department of Chemistry, Heilongjiang University, Haerbin, PR China;(3) Department of Chemistry, Beijing University, Beijing, PR China |
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Abstract: | Summary A new class of differentially ring-substituted titanocene dichlorides of the type CpCpTiCl2 has been prepared by reacting CpM (M=Li, K; Cp=RC5H4) with CpTiCl3 (Cp=MeOCH2CH2C5H4). The crystal structure of Cp(PhCEt2C5H4)TiCl2, the first example, has been determined by x-ray diffraction and refined to a final R factor of 0.0532 for 2304 reflections. The crystal belongs to the monoclinic space group C
2h
5
–P21/c with unit cell parameters:a 10.205(6),b 13.003(5),c 17.591(9) Å, 101.91(4)°, V=2284 Å3, Z=4 and Dc=1.32 g/cm–3. Replacement of one neomenthyl in bis(neomenthyl-cyclopentadienyl)titanium dichloride by one MeOCH2CH2 — raises the e.e. value from 5.8% to 11.2% in the catalytic asymmetric hydrogenation of 2-phenyl-1-butene. |
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