Abstract
The diphosphane 2,2′-bis(diphenylphosphinomethyl)-1,1′-biphenyl ( 1, BISBI) was sulfonated by means of oleum containing 65% SO 3. The sulfonation product, 2 (BISBIS), was purified by extraction-reextraction techniques. The sodium salts, 3, of BISBIS ( 2) are accessible as a mixture of several sulfonated derivatives. In the heterogeneous (biphasic) hydroformylation of propene, this sulfonated ligand 3 yields exceptionally high n/iso ratios of the resulting butyric aldehyde (rhodium catalysis). High activity and productivity at low phosphane/rhodium ratios are additional advantages of using 3. Hydroformylation of higher olefins, e.g., 1-hexene, is also within the scope of the new catalytic Rh(I)/BISBIS system.
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