Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 75, Issue 3, Pages 598-610Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo902053t
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- Council for Chemical Sciences of The Netherlands Organization for Scientific Research (CW-NWO)
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A series of oligo(ethylene oxide) (oligoEO) substituted 2-ureido-pyrimidinones (UPy), differing in the number of ethylene oxide units and the length of the aliphatic spacer connecting the oligoEO side chain with the UPy group, have been prepared. It was found that variation in these structural parameters strongly influences the dimerization constant (K-dim) of the UPy dimer and the association constant (K-a) of UPy with 2,7-diamido-1,8-naphthyridine (NaPy) in chloroform. By analyzing the relation between dimerization strength, length of aliphatic spacer, and the number of EO units in the oligoEO chain, we present strong evidence that the reduction in hydrogen bond strength is caused by competitive intramolecular hydrogen bonding of the ether atoms of the oligoEO chain to the hydrogen bond donors of the UPy unit.
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