Abstract

The special interest attached to the chemistry of metal carbonyls arises  from several causes. While quite distinct from                the metal carbonyls in the organometallic compounds, they          differ in Physical  properties (e.g., volatility) from all other compounds of the transition metals. Chemically, they constitute a group of compounds in which the formal valency of the metal atoms is zero, and in this respect they are                comparable only with          the recently discovered compounds. As a class, the metal carbonyls are reactive compounds, and a number of              new types of inorganic compounds have been discovered. Carbon monoxide (CO) is an important building block in M(CO)6 for the synthesis of many compounds.

Tungsten hexacarbonyl (also called tungsten carbonyl) is the chemical compound with the formula W(CO)6. This complex gave rise to the first example of a dihydrogen Complex with an octahedral geometry consisting of six rod‐like CO ligands radiating from the central W atom with dipole moment 0.0D. All reactions of W(CO)6 commence with displacement of some CO ligands in W(CO)6. It can be used as a precursor to catalysts for alkene metathesis and in ligand substitution reactions. W(CO)6 are also a popular reagent in organometallic synthesis, because one or more CO ligands can be displaced by other donor ligands. Because the catalyst and precursors are sensitive to air, all W(CO)6 catalyzed reactions must be carried out under an inert atmosphere. W(CO)6 is found their important role in finding some specific products. The successful development of metal carbonyl complexes and their products has been demonstrated by various examples. This article highlights various types of substitution reactions of W(CO)6 with various ligands and shows a few examples of what is being done in the area as we change to our work of the future.

Keywords:  Complexes, Metal Carbonyl, substitution Reaction, Carbon monoxide, Catalysts, Organometallic.