Zirconocene Dichloride and Related Reagents
نویسندگان
چکیده
منابع مشابه
Transamidation of primary amides with amines catalyzed by zirconocene dichloride.
Zirconocene dichloride (Cp(2)ZrCl(2)) has been shown to be an effective catalyst for the transamidation of primary amides with amines in cyclohexane at 80 °C in 5-24 hours. For favourable substrates, the reaction can be performed at temperatures as low as 30 °C.
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The insertion of internal olefins (hydroalumination) and chain walking isomerisation at di-n-octylaluminium hydride [Al(Oct)2H], promoted by zirconocene dichloride [Cp2ZrCl2] has been studied. The reaction between [Cp2ZrCl2] and [Al(Oct)2H] in non-polar solvents leads to clusters containing bridging hydride ligands between Zr and Al. This system promotes hydroalumination of 1-octene but is larg...
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Equilibrium constants have been determined for the formation of 15 different zirconocene monomethyl monochloro complexes from the respective dichloride complexes and AI2 (CH3)6' The results indicate that the tendency of a particular zirconocene complex to exchange a chloride against a methyl ligand is a measure for the electron deficiency at its Zr center. The results indicate particularly low ...
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An improved synthesis of 1 and 2 is described that allows access to these complexes in multigram quantities necessary for catalytic applications. The crystal structures of 1 and 2 are compared and the conformational preferences of the ligands, that are important for catalytic applications, are discussed. Complex 2 was evaluated as a catalyst for carbomagnesation reactions. 2005 Elsevier B.V. Al...
متن کاملBiguanidinium dichloride
The asymmetric unit of the title compound, C(2)H(9)N(5) (2+)·2Cl(-), is composed of one diprotonated biguanidinium cation and two chloride anions. The diprotonated cation consists of two planar halves twisted by 36.42 (6)°. The ions are associated in the crystal structure by extensive hydrogen bonding into a three-dimensional network; the diprotonated biguanidinium cation is hydrogen bonded to ...
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ژورنال
عنوان ژورنال: Synlett
سال: 1999
ISSN: 0936-5214,1437-2096
DOI: 10.1055/s-1999-6185