EN
Chemical synthesis of 2'-0-[13C methyl-rCGCGCG and 5-methyl-rCGCGCG using support-aided phosphoramidite method is presented. 2'-0-Methyl guanosine derivative was separated from its 3'-0-methyl counterpart using transient 5',3'-0-silylation with l,3-dichloro-l,l,3,3-tetraisopropyldisiloxane (Markiewicz reagent). The hexamers were obtained in a purity suitable for NMR studies.