Question

The reaction of methyl iodide with carbon tetrachloride

Answer 1

Answer:

The kinetics of the photoinitiated reductions of methyl iodide and carbon tetrachloride by tri‐n‐butylgermanium hydride in cyclohexane at 25°C have been studied and absolute rate constants have been measured. Rate constants for the combination of CH3ċ and CCl3ċ radicals are equal within experimental error and are also equal to the values found for the self‐reactions of most non‐polymeric radicals in low viscosity solvents, i.e. ∼1–3 × 109 M−1 sec−1.

Rate constants for hydrogen atom abstraction by CH3ċ and CCl3ċ radicals are both ∼1−2 × 105 M−1 sec−1. Tri‐n‐butyltin hydride is about 10–20 times as good a hydrogen donor to alkyl radicals as is tri‐n‐butylgermanium hydride.

The strength of the germanium–hydrogen bond, D(n‐Bu3Ge–H) is estimated to be approximately 84 kcal/mole.

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