... Silylated nucleobases were prepared according to Griengl et al. ... The volume of the reaction mixture was reduced to 20 mL at the rotary evaporator, 5 mL distilled ... the reaction mixture was evaporated to dryness and the raw product purified by chromatography (SiO 2 , CHCl 3 ...
[Kelley, James L.; Kelsey, John E.; Hall, William R.; Krochmal, Mark P.; Schaeffer, Howard J. Journal of Medicinal Chemistry, 1981 , vol. 24, # 6 p. 753 - 756]