1. (a) Activation of Molecular Hydrogen and Related Molecules by Transition Metal Complexes. Part III.
2. (b) For Part II, see L. VASKA and R.E. RHODES, J. Am. Chem. Soc., in press.
3. Acknowledgment is made to the donors of the Petroleum Research Fund, administered by the American Chemical Society, for partial support of this research.
4. Present address of the author.
5. Five-Coordinate Hydrido-Carbonyl Complexes of Rhodium and Iridium and their Analogy with CoH(CO)4