Скачать или смотреть Organohafnium chemistry | Wikipedia audio article

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00:01:23 1 Zirconium hydrides and hydrozirconation
00:03:06 2 Zirconocyclisation
00:03:27 3 Organohafnium chemistry



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SUMMARY
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Organozirconium compounds are organometallic compounds containing a carbon to zirconium chemical bond. Organozirconium chemistry is the corresponding science exploring properties, structure and reactivity of these compounds. In general organozirconium compounds are stable and non-toxic. They are used in organic chemistry as an intermediate in the synthesis of chemical compounds and share characteristics with organotitanium compounds also a Group 4 element. Organozirconium compounds have been widely studied, in part because they are useful catalysts in Ziegler-Natta polymerization.
The first organozirconium compound discovered (1953) was zirconocene dibromide, belongs to the metallocene family. It was prepared in a reaction of the cyclopentadienyl magnesium bromide and zirconium(IV) chloride. Zirconocenes are used as polymerization catalysts; their use partly replaced traditional heterogeneous Ziegler-Natta catalysts.