Abstract
A series of osmium monoesters containing heterocyclic nitrogen ligands has been prepared from bicyclic and acyclic alkenes, and IR, UV-visible, and NMR spectroscopic properties are reported. As an elaboration of the NMR properties of the monoesters, the chemical shifts of the protons of the complexes in deuterochloroform solution have been followed as a function of increasing lanthanide shift reagent concentration. Besides providing general indices to the identification of the monoesters, the observed induced shifts are consistent with the formation of a unique product from the alkene substrates even when cis/trans isomers are encountered. The observed shifts are qualitatively consistent with a structure containing the expected osmyl group with the nitrogen atoms of the ligands and the oxygens of the esterified olefin lying approximately in a plane through the osmium atom perpendicular to the osmyl group.
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