Pyrophosphite ligands and their use in transition metal catalyzed processes
AssigneeCiba Specialty Chemicals Corporation
InventorsAndrea R. Smith, Stephen D. Pastor
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Abstract
Catalyst systems which comprise a transition metal and a pyrophosphite ligand are particularly effective as catalysts for hydrosilation reactions. The transition metal is from groups 7-11 of the Periodic Table, and the pyrophosphite has the following formula: ##STR1## wherein E and E' are independently a direct bond, --S--, --Se--, or --CR.sub.9 R.sub.10 -- where R.sub.9 and R.sub.10 are independently hydrogen or alkyl of 1-18 carbon atoms, and R.sub.10 can also be phenyl. R is H or methyl, R.sub.1-8 are independently H, C.sub.1-18 alkyl, C.sub.5-12 cycloalkyl, or C.sub.7-15 phenylalkyl.
Claims7
A transition metal ligand complex catalyst system which comprises
- (a) a transition metal selected from Groups 7-11 of the periodic table;
- and
- (b) a pyrophosphite of formula I ##STR3## wherein R is independently hydrogen or methyl,
- R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are independently hydrogen, alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms or phenylalkyl of 7 to 15 carbon atoms, and
- E and E' are independently a direct bond, --S--, --Se-- or --CR.sub.9 R.sub.10 -- where R.sub.9 and R.sub.10 are independently hydrogen or alkyl of 1 to 18 carbon atoms, or R.sub.10 is also phenyl.
Dependencies are inferred from the claim text.