| 1. | Quaternization of triphenylphosphine with most secondary halides is inefficient.
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| 2. | It is obtained from 3-dimethylaminophenol and dimethylcarbamoyl chloride and subsequent quaternization with methyl bromide or dimethyl sulfate
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| 3. | However, once the benzimidazole is detached from cobalt by quaternization with methyl iodide, it is replaced by or hydroxyl ions.
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| 4. | The amine is basic and undergoes quaternization with methyl iodide to give the ammonium salt [ C 6 H 5 CH 2 N ( CH 3 ) 3 ] + I ".
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