Molecular and crystal structure of 4′-cyanobenzo-15-crown-5

Synthesis of Bis(2,2-benzimidazolyl)dibenzo-18-crown-6

“…The starting materials 2a-d were synthesized as we described previously [4]. Compounds 2e,f,g were prepared by the methods of papers [6][7][8] respectively. Bis(2,2-benzimidazolyl)-DB-18-C6 (3).…”

“…We used the conditions found for the synthesis of compound 3 for the reaction of diamine 1 with the known dipropionyl-(2b), dibutyryl-(2c), and divaleryl-DB-18-C6 (2d) [3] and derivatives containing thioamide (2e) [6], carboxyl (2f) [7], and nitrile (2g) [8] in place of the acyl substituents. The yield of compound 3 decreased with increasing length of the acyl substituent: for the divalerylsubstituted 2d the yield was only 3%.…”

Anomalous behavior of the amides of benzo-and dibenzocrown thiocarboxylic acids under the conditions of methylation

“…A single crystal was grown by the crystallization of compound 2 from a dilute solution in a mixture of hexane and acetone, and the formation of the nitrile in this reaction was also confirmed by X-ray crystallographic analysis [8].…”