Tetranuclear Rhodium(I) Macrocycle Containing Cyclodiphosphazane [Rh2(μ-Cl)2(CO)2{(tBuNP(OC6H4OMe-o))2-κP]2and Its Reversible Conversion intotrans-[Rh(CO)Cl{(tBuNP(OC6H4OMe-o))2-κP}2]

The 1:1 reaction between cis -[ t BuNP(OC 6 H 4 OMe- o )] 2 ( 2 ) and [Rh( μ -Cl)(CO) 2 ] 2 affords novel tetranuclear rhodium(I) macrocycle ( 3) containing two cyclodiphosphazanes bridged by two [Rh(μ-Cl)(CO)] 2 moieties, whereas the corresponding 4:1 reaction affords trans -[Rh(CO)Cl{( t BuNP(OC 6 H 4 OMe- o )) 2 -κP} 2 ] ( 4 ).