New rhodium(I) water-soluble complexes with 1-alkyl-1-azonia-3,5-diaza-7-phospha-adamantane iodides and their catalytic activity

Abstract

The water-soluble phosphine ligands, 1,3,5-triaza-7-phosphatricyclo[3.3.1.13,7]decane (tpa) and 1-alkyl-1-azonia-3,5-diaza-7-phosphatricyclo[3.3.1.13,7]decane iodides (Rtpa+I−), with alkyl=methyl(mtpa+I−), ethyl (etpa+I−) and n-propyl, (ptpa+I−), and mtpa+Cl− react with [Rh2Cl2(CO)4] giving the rhodium(I) complexes [RhCl(CO)(tpa)2], [RhI(CO)(Rtpa+I−)2], [RhCl-­(CO)(mtpa+Cl−)3] and [RhI(CO)(Rtpa+I−)3]. The properties and reactivities of the complexes have been investigated using 1H and 31PNMR and IR spectroscopies. The five-coordinate complexes in solutions show dynamic properties. The complexes are catalysts of the water-gas shift reaction, the hydrogenation of CC and CO bonds, the hydroformylation of alkenes and the isomerization of unsaturated compounds. Copyright © 1999 John Wiley & Sons, Ltd.