Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Reexamination Certificate
2008-02-27
2011-12-06
Nazario Gonzalez, Porfirio (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
Reexamination Certificate
active
08071802
ABSTRACT:
Process for preparing bridged, stereorigid, stereomerically pure dialkoxide metallocenes, diaryl oxide metallocenes and diphenoxide metallocenes of formula Q(Cp)(Cp′)M(OR3)2 in which Cp and Cp′ are independently cyclopentadienyl, indenyl or fluorenyl; Q is a bridge between Cp and Cp′; M is a group 4 transition metal, especially Zr, Hf or Ti; R3 is C1-C10 alkyl, optionally substituted by aryl groups, or optionally substituted C6-C10 aryl, characterized in that, a bridged, stereorigid metallocene dihalide Q(Cp)(Cp′)M(X)2, in the form of a rac/meso mixture, is reacted with an alkylating reagent R4-M-(X)n wherein R4 is C1-C10 alkyl or C6-C10 aryl; M is an alkali metal or alkaline earth metal; X is halogen; n is the oxidation number of M reduced by 1; and the resulting reaction mixture or isolated dialkylmetallocene is reacted with an alcohol, an aryl alcohol or a phenol of the general formula HO—R3.
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Search Report for International Application No. PCT/EP2008/001544 dated Sep. 9, 2008.
Liedtke Nicole
Unsleber Hans-Joachim
Wendt Ralf-Alexander
Chemtura Corporation
Gonzalez Porfirio Nazario
Suhadolnik Joseph
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