The first Rh complex with an eta(4)-coordinated rac-et,ph-P4 ligand [et,ph-P4 = (Et2PCH2CH2)(Ph)PCH2P(Ph)(CH2CH2PEt2)] has been synthesized by reacting [Rh(nbd)2]BF4 with meso- or rac-et,ph-P4 in dichloromethane. The reaction occurs fairly rapidly at room temperature to form [rac-RhCl2(eta(4)-et,ph-P4)](+) in high yields, regardless of whether one starts with mixed or even pure meso-et,ph-P4 ligand. This unusual and highly selective metal assisted isomerization of the meso-et,ph-P4 ligand to its rac-et,ph-P4 disastereomer will be discussed.

No abstract

No abstract

Bis ("-3,11-diethyl-6,8-diphenyl-3,6,8,11-tetraphosphatridecane-4 P 3 ,P 6 :P 8 ,P 11 )dirhodium(I) bis(tetra¯uoroborate), [Rh 2 -(C 25 H 40 P 4 ) 2 ](BF 4 ) 2 , is a bimetallic complex containing two binucleating tetra-tertiary phosphine ligands. The distance between the metal centers is 5.4555 (11) A Ê , with no metal±

No abstract