also obtained from the reaction of (CF3)2C(OH)PH(CF3) or PH(CF3)2 with the anionic cluster [Os3H(CO)11]–. Furthermore the primaryphosphines (CF3)2C(OH)PH2 and PH2(CF3) display similar P–C bond cleavage upon reactions with [Os3H(CO)11]– to afford the phosphido-bridged cluster [Os3(µ-H)(CO)10(µ-PH2)]. On the other hand, (CF3)2C(OH)PH2 gave simple substitution products upon reactions with [Os3(CO)10(MeCN)2]