| abstract |
Diphosphine of formula In nR 1 R 2 P—H 2 C—Ar—CH 2 PR 1 R 2 (I)n nare prepared by a process that comprises a) reacting a dimethyl compound of formula IIn nH 3 C—Ar—CH 3 (II)n nwith a base and an N-substituted aminophosphorous halide to form bis(aminophosphinomethyl) compound of the formula IIIn nR 3 R 4 P—H 2 C—Ar—CH 2 —PR 3 R 4 (III)n nb) reacting the compound of formula III with HCl to form bis(dichlorophosphinomethyl) compound of formula IVn nCl 2 P—H 2 C—Ar—CH 2 —PCl 2 (IV)n nand c) reacting the compound of formula IV with an organometallic reagent to give the product compound of formula I, wherein groups R 1 and R 2 are each, independently of one another, a substituted or unsubstituted aromatic, heteroaromatic or aliphatic hydrocarbon group and may have a covalent bond connecting them and Ar is a substituted or unsubstituted aromatic or heteroaromatic hydrocarbon group an R 3 and R 4 are each, independently of one another, an N-substituted alkylamino or arylamino group. |