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The modified triester approach has been further improved and refined to the synthesis of defined sequences of deoxyribo-oligonucleotides. Improvements include arylsulfonyltetrazoles as faster and milder condensing agents, benzenesulfonic acid to avoid depurination during deblocking of trityl protecting groups and improved chromatographic procedures for purification of triester intermediates and purification of the final product containing 3'-5' phosphodiester linkages.
Stawiński et al. (Sat,) studied this question.
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