Ferrocenyl-1,2-diphosphines, the production thereof and their use
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United States of America Patent
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May 20, 2008
Grant Date -
Jun 21, 2007
app pub date -
Dec 10, 2004
filing date -
Dec 12, 2003
priority date (Note) -
Expired
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Abstract
The invention relates to compounds of formula (I) provided in the form of racemic compounds, mixtures of diastereomers or essentially pure diastereomers, wherein R.sub.1 represents a hydrogen atom or C.sub.1-C.sub.4-alkyl, and at least one secondary phosphine depicts an unsubstituted or substituted cyclic phosphine group, or phosphonium salts thereof having one or two monovalent anions or a divalent anion. The compounds of formula (I) can be obtained by means of a novel method and are valuable ligands for catalytically active metal complexes in asymmetrical synthesis ##STR00001##
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