Pentacarbonylrhenium Halides

The pentacarbonylrhenium halides, first prepared by Hieber,12 are starting materials for the syntheses of many novel rhenium carbonyl compounds.3"7 Pho-... 

Pentacarbonylrhenium halides are white, crystalline solids that exhibit moderate solubility in nonpolar organic solvents. The iodo derivative is most soluble, and the chloro analog least soluble. All the complexes are stable in air at room temperature however, heating the solutions or solids results in formation of the tetracarbonylrhenium halide dimers. 

The pentacarbonylrhenium halides, first prepared by Hieber, are starting materials for the syntheses of many novel rhenium carbonyl compounds. Photochemical, vibrational, and kinetic " properties of these molecules have been studied. A rhenium carbonyl halide-alkyl aluminum halide system polymerizes acetylene and is a useful olefin-metathesis catalyst. " ... 

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