Synthesis of 1′≠,2′,3′,4′≠,5′,5′′‐2H6‐β‐D‐ Ribonucleosides and 1′≠,2′,2′′,3′,4′≠,5′,5′′‐2H7‐β‐D‐ 2′‐Deoxyribonucleosides for Selective Suppression of Proton Resonances in Partially‐Deuterated Oligo‐DNA, Oligo‐RNA and in 2,5A Core (1H NMR Window).