Tris(3,5-dimethylpyrazolyl)borato molybdenum and tungsten nitrosyl mentholates

Abstract

The complex [M(NO)L*X₂][L*= tris(3,5-dimethylpyrazolyl)borate; M = Mo, X = Cl or I; M = W, X = Cl] reacted with (+)- and (–)-menthol (C₁₀H₁₉OH) affording diastereomeric mixtures of [M(NO)L*(X)(OC₁₀H₁₉)]. These were separated by chromatography, and the structure of the diastereomer [Mo(NO)L*(Cl){(–)-OC₁₀H₁₉}] determined crystallographically. The absolute configuration at the metal in this compound was determined to be R, and those of all other complexes [M(NO)L*(X)(OC₁₀H₁₉)] related to it by comparison of their circular dichroism spectra.