New NMR evidence on the uranylcitrate complexes
Abstract A 1 H and 13 C NMR study of the complexation of citric acid to uranyl ion is reported over a wide pH range (1.3–10.3). At least six complexes are formed. Structures are proposed for four of them; in particular one of the complexes dominant at high pH values seems to be a cyclic trimer (3:2).
Abstract A novel protecting group for the 2′-hydroxyl of ribonucleosides, p -nitrobenzyloxymethyl, is used in the rapid solid phase synthesis of the oligonucleotide U(U) 11 U; it can be readily removed from the oligomer product by treatment with tetrabutylammonium fluoride.