Organic letters

Hydrogen-bonded cyclic tetramers based on ureidopyrimidinones attached to a 3, 6-carbazolyl spacer

Y Yang, M Xue, LJ Marshall, J de Mendoza

Index: Yang, Yong; Xue, Min; Marshall, Laura J.; De Mendoza, Javier Organic Letters, 2011 , vol. 13, # 12 p. 3186 - 3189

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Citation Number: 19

Abstract

Direct attachment of two 2-ureido-4-[1 H]-pyrimidinone (UPy) subunits to a 3, 6-carbazolyl core gives rise to a highly viscous, supramolecular polymer. However, insertion of a methylene spacer between the UPy's and the carbazole leads to a well-defined, cyclic tetramer, in a belt-shaped arrangement, as evidenced by MALDI-TOF, DOSY, and NOESY spectra.