A new and attractive phosphorylation procedure which allows the introduction, via phosphotriester intermediates, of 5'-phosphate functions of DNA fragments is described. The method is based on the activation of bifunctional phosphorylating agents with 1-hydroxybenzotriazole. The approach will be exemplified by the synthesis of pACGC using four different 5'-phosphotriester intermediates.
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Marel et al. (1982) studied this question.