Cadmium chloride (CdCl2) has been found to be an efficient catalyst for a neat [2 + 3]-cycloaddition of NaN3 with nitriles to afford 5-substituted 1H-tetrazoles in good yields. The shorter reaction times, greater yields of the product, and easy workup are the advantages of this methodology.
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Venkateshwarlu et al. (2009) studied this question.
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