| abstract |
The invention relates to a compound of formula (I), wherein R1 is C1-C8alkyl, phenyl or phenyl substituted by from 1 to 3 C1-C4alkyl or C1-C4alkoxy substituents; R2 and R3 are each independently of the other hydrogen or C1-C12alkyl; and Hal is F, Cl, Br or I. Compounds of formula (I) are valuable intermediates for compounds of formula (III) which are also a subject of this invention, wherein R1, R2, R3 and Hal are as defined above; R10 and R11 are identical or different and are C1-C12alkyl, C5-C12cycloalkyl, phenyl, C5-C12cycloalkyl substituted by C1-C4alkyl or by C1-C4alkoxy, or phenyl substituted by from one to three C1-C4alkyl, C1-C4alkoxy, -SiR4R5R6, halogen, -SO3M, -CO2M, -PO3M, -NR7R8, -[+NR7R8R9]X- or C1-C5fluoroalkyl substituents; or the group -PR10R11 is a radical of formula (IV, IVa, IVb or IVc); R4, R5 and R6 are each independently of the others C1-C12alkyl or phenyl; R7 and R8 are H, C1-C12alkyl or phenyl or R7 and R8 together are tetramethylene, pentamethylene or 3-oxa-1,5-pentylene; R9 is H or C1-C4alkyl; M is H or an alkali metal; X- is the anion of a monobasic acid. The compounds of formula (III) are themselves important intermediates for silylated ferrocenyldiphosphines and their metal complexes. Ferrocenyldiphosphines that contain an organic radical bonded via a silylene group to a cyclopentadienyl ring can be immobilised in a simple manner both on inorganic and on polymeric organic carriers or, after the introduction of a polymerisable group, can be immobilised also by copolymerisation. With rhodium and iridium the immobilised ferrocenyldiphosphine ligands form complexes that can be used as highly active catalysts in the enantioselective hydrogenation of carbon-carbon, carbon-nitrogen or carbon-oxygen double bonds. |