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The ring-substituted bis(cyclopentadienyl)silanesMe
2Si(C5H5) (MeC5H4) (1a) andMe
2Si(MeC5H4)2 (2a) could be prepared by the reactions ofMe
2SiCl2 with C5H5Na andMeC5H4Na or only withMeC5H4Na, respectively. Metallation of1 a or2 a withn-BuLi and following reaction with TiCl4 led to the first ringsubstituted [1]titanocenophanes,Me
2Si(C5H4) (MeC5H3)TiCl2 (1 b) orMe
2Si(MeC5H3)2 TiCl2 (2 b), respectively. On reaction with NaI,1 b yieldedMe
2Si(C5H4) (MeC5H3)TiI2 (1 c). Structural assignments of the compounds could be made on the basis of their1H NMR spectra. 相似文献
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The 1,1′-ring-substituted vanadocene dichlorides [V(η5-C5H4R)2Cl2] (R = CMe3, SiMe3, SiEt3) have been prepared from VCl4 and the appropriate lithiated cyclopentadiene, C5H4RLi, in 1 : 2 ratios. All complexes were characterized by elemental microanalysis and IR spectroscopy. The crystal structures of [V(η5-C5H4SiMe3)2Cl2] 3 and the parent compound [V(η5-C5H5)2Cl2] 1 have been determined by X-ray diffraction and are in accordance with expectations. Compound 1 crystallizes with two crystallographically independent molecules in its monoclinic unit cell. These two molecules are quite similar in their essential structural features. Compound 3 crystallizes in the triclinic space group P1 . The trimethylsilylcyclopentadienyl rings are bound in a staggered relative orientation. 相似文献
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Summary The retention characteristics of 22 aniline derivatives were determined on a porous, graphitized-carbon column in unbuffered acetonitrile-water and methanol-water mixtures. Each aniline derivative gave symmetrical peaks in each eluent without buffers. Good linear correlations were found between the log k and the concentration of the organic component in the eluent. The slope and intercept values differed according to the type of organic modifier and the charcter, number and position of substituents, indicating the different selectivities of methanol and acetonitrile and the good separating power of the column. Multivariate mathematical-statistical calculations proved that the retention of ring-substituted aniline derivatives is mainly governed by electronic parameters and the hydrogen acceptor capacity of substituents. 相似文献
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