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Abstract: This note shows that some of the results, interpretations and discussions presented by Dong et al. [X. Dong, L. Wang, J. Zhou, H. Yu, T. Sun, Catalysis Communications 7 (2006) 1–5] may not be correct. Here by comparing the internal diameter of beta-cyclodextrin pore and the external diameter of MCM-41 particles it is shown that a single MCM-41 particle can not be located in the pore of beta-cyclodextrin and even it can be concluded that beta-cyclodextrin may be located in the pores of MCM-41 and therefore the interpretations presented in the article mentioned above are not correct. Even more the Scheme presented in the said article is incorrect and a better demonstration of the facts is proposed here. [Copyright &y& Elsevier]

An efficient procedure for the synthesis of some N-nitroaryl derivatives of nucleobases via microwave-assisted N-nitroarylation of nucleobases in the presence of SiO2 and Cs2CO3 in DMSO, as the homogenizing solvent, is described. In this method, some pyrimidine and purine nucleobases are nitroarylated regioselectively in moderate to high yields and short reaction times. [ABSTRACT FROM AUTHOR]