Tungsten hexamethyl

Alkyl ligands form metal-carbon o bonds. Often they occur in conjunction with other organic ligands or CO, but can be found on their own, as in tungsten hexamethyl (1), and in [Ti(CH2SiMe3)4] where... 

Each of these alkylating agents is readily available and each has a characteristic and well-known reactivity. The successful preparation of hexamethyl tungsten is one fairly recent example of the necessity of having a number of alternative reagents for a given synthesis (2). 

Substituted-benzene-metal tricarbonyls of chromium, molybdenum, and tungsten do not have any intense band in the 900 to 980 cm range, while the parent compounds absorb at 902 and 978 cm, respectively 131). The IR spectra of hexamethyl-, hexaethyl-, and iefa-diisopropylbenzene(Mo, W) tricarbonyls show weak to medium intensity bands, probably due to some... 

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