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Cyclobutane derivativesQ 0022 DOI: 10.1002/chin.201040054

N,N'-Diarylsquaramides: General, High-Yielding Synthesis and Applications in Colorimetric Anion Sensing. — A simple, efficient, and widely applicable method is reported. The products show higher hydrogen bond ability and acidity than urea deriv-atives and can be used as colorimetric anion sensors. — (ROSTAMI, A.; COLIN, A.; LI, X. Y.; CHUDZINSKI, M. G.; LOUGH, A. J.; TAYLOR*, M. S.; J. Org. Chem. 75 (2010) 12, 3983-3992, DOI:10.1021/jo100104g ; Dep. Chem., Univ. Toronto, Toronto, Ont. M5S 3H6, Can.; Eng.) — Jannicke

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