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All articles of this category The palladium(0) catalysed coupling reaction of 4-iodo-1-triphenylmethylimidazole ( 7 ) or its 2-methyl analogue 8 afforded the 4,4′-biimidazoles 9 and 10 , respectively. Treatment of these compounds with 60% aqueous trifluoroacetic acid gave 4,4′-biimidazole and 2,2′-dimethyl-4,4′-biimidazole as their bistrifluoroacetate salts 11 and 12 , respectively.
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Cliff et al. (1994) studied this question.
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