Observations regarding the catalytic potential of RNA and the role of RNA in biology have formed the basis for the “RNA world” hypothesis, which suggests that a genetic system based on self-replicating polyribonucleotides preceded modern biology. However, attempts to devise a realistic prebiotic synthesis of nucleic acids from simple starting materials have been plagued by problems of poor chemical selectivity, lack of stereo-and regiospecificity, ...
[Anastasi, Carole; Crowe, Michael A.; Powner, Matthew W.; Sutherland, John D. Angewandte Chemie - International Edition, 2006 , vol. 45, # 37 p. 6176 - 6179]