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Zusammenfassung:
Ab initio calculations with complete geometry optimization are reported for monomeric Z- and E-2-methoxy-1-iodo-1-lithio-2-phenyl-1-alkenes. All the stationary points are true local minima on the energy surfaces. The structural data of the lithioalkenes show clear-cut evidence for the Li-Phenyl interaction in Z-isomer and the Li-O chelation in E-isomer in gas-phase. Based on the ab initio energies, Li-Phenyl interaction should be less relevant than Li,O chelation. Both effects are absent when coordination by solvent (water) is accounted. Inclusion of solvation by solvent continuum model (IPCM) seems essential to rationalize the experimental results.
