Never di- and trinuclear Rh complexes, [Rh-2(PPh3)(4)(H)(4)(Me2CO)(2)(mu -p
yz)](ClO4)(2). EtOH and [Rh-3(PPh3),(mu -pyz)(3)](ClO4)(3). EtOH were selec
tively isolated from the reaction of [Rh(PPh3)(2)(H)(2)(Me2Co)(EtOH)]ClO4 w
ith pyrazine (pyz) in Me2CO and THF, respectively. Their structures were cr
ystallographically characterized.