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The photoelectron spectra of several aryl alkyl selenides have been measured. Several of the spectra show evidence for the existence of two predominant rotamers, one with maximumoverlap and one with minimal overlap. Using the interaction model developed here, we show how steric factors effect rotamer populations and demonstrate that electronic effects determine whether or not different rotamers can be detected by the photoelectron technique.Recently we observed1 that the parent hydrocarbon

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The crystal and molecular structures of the complexes trans-bis(dimethylglyoximato)(trifluoroethyl)(L)cobalt(III) [L = 4-cyanopyridine (4-CNpy) (I), triphenylphosphine (PPh3) ( ), trimethyl phosphite

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