Oxygen rhodium-hydrogen bonds

Bergbreiter " synthesized smart phosphine ligands 26 and 27 (Figure 6) from an ethylene oxide-propylene oxide-ethylene oxide triblock co-polymer that possesses a property termed inverse temperature-dependent solubility. This means that at low temperature, the phosphines and their rhodium complexes are soluble in water through the formation of hydrogen bonds between oxygen atoms and water molecules, but, on heating above the critical-temperature cloud... 

Hydrogenation of phthalic anhydride over copper chromite afforded 82.5% yield of the lactone, phthalide, and 9.8% of o-toluic acid resulting from hydrogenolysis of a carbon-oxygen bond [1015]. Homogeneous hydrogenation of a,a-dimethylsuccinic anhydride over tris(triphenylphos-phine)rhodium chloride gave 65% of a,a-dimethyl- and 7% of )S,)S-dimethyl-butyrolactone [1016]. 

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