Ferrocene bis(phosphonite) ligands and complexes for transition-metal-catalyzed reactions
AssigneeCiba Specialty Chemicals Corporation
InventorsStephen D. Pastor, Sai P. Shum
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Abstract
The synthesis of new sterically hindered ferrocene bis(phosphonites) of formula I ##STR1## the synthesis of the corresponding transition-metal complexes and the use of these complexes in transition-metal-catalyzed reactions are described.
Claims20
A new sterically hindered ferrocene bis(phosphonite) of formula I ##STR3## wherein R.sub.1, R.sub.2 and R.sub.3 are independently hydrogen, alkyl of 1 to 20 carbon atoms, aralkyl of 7 to 15 carbon atoms or aryl of 6 to 10 carbon atoms,
- X.sub.1 and X.sub.2 are independently a direct bond, alkylidene of 1 to 20 carbon atoms, sulfur or selenium.
A transition-metal complex of the ferrocene bis(phosphonite) of formula I ##STR4## wherein R.sub.1, R.sub.2 and R.sub.3 are independently hydrogen, alkyl of 1 to 20 carbon atoms, aralkyl of 7 to 15 carbon atoms or aryl of 6 to 10 carbon atoms,
- X.sub.1 and X.sub.2 are independently a direct bond, alkylidene of 1 to 20 carbon atoms, sulfur or selenium, and
- the transition-metal is selected from the group consisting of the transition metals of group VIII.
Dependencies are inferred from the claim text.