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Chemical Industry Co., Ltd., for the kind supply of (Aland (S)-methyl 3-hydroxyisobutyrates. Supplementary Material Available: Tables of hydrogen atom coordinates and values, anisotropic thermal parameters, bond angles, and torsion angles for two complexes, (E)-(MeO-CeH4COCH=CHMe)Cr(CO)3 and (E)-(Me-C6H4COCH= CHMe)Cr(CO)3, andNMR spectra (400 MHz) for compounds 13,17,20, and 21 (18 pages). Ordering information is given on any current masthead page.

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272ChemInform Abstract The title compound can be stabilized at ambient temperature. The degradation of this hydride, giving H2 and the dimer ((C5H5)Fe(CO)2)2, appears to be a result of a chain process that is initiated by oxidants. The effects of additives on the rate of degradation in benzene are studied (table). The hydride also undergoes CO substitution and hydride self-exchange reactions. The mechanisms of these processes are discussed.