Joel T. Mague, C. Theivarasu, D. Suresh and Maravanji S. Balakrishna. Conformational Studies of Substituted Chromans: Crystal Structures of 2,2′-(1E,1′E)-(2,3-Dimethylchroman-2,4-diyl)bis(Azan-1-yl-1-ylidene)bis(Methan-1-yl-1-ylidene)Diphenol (I) and 2,2′-(1E,1′E)-(2-Ethyl-3-Methylchroman-2,4-diyl)bis(Azan-1-yl-1-ylidene)bis(Methan-1-yl-1-ylidene)Diphenol (II) // Journal of Chemical Crystallography. 2010. Vol. 40, N 12, 1129-1136.
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http://dx.doi.org/10.1007/s10870-010-9808-5 