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Abstract
New hemilabile rhodium complexes with phosphonate-phosphane ligands (RO)2P(O)(CH2)nPPh2 1a-c (n = 1-3) have been synthesized and characterised. Effective methods for the preparation of the ligands were developed and the characterisation was carried out with IR and NMR spectroscopy. Additionally, 1b and 1c were converted into the corresponding phosphonate-phosphanoxyds 4b, c, and phosphonate-phosphonium bromides 5b, c. Both, open-chain (2a-c) and chelate (3a-c) rhodium complexes were easily accessible from 1a-c. The hemilabile behaviour of the rhodium complexes 2 and 3 was demonstrated by their smooth conversion into each other. The structure of the phosphonate-phosphane ligands 1a-c significantly affected the catalytic properties of 2a-c in methanol carbonylation.
