Reactivity of organic azo-compounds. XII. Correlation of chemical shift of hydroxyl group in NMR spectra of aromatic hydroxyazo compounds with substituent constants

Microwave-Assisted Synthesis of Phthalocyanine Zinc Complexes Derived from Aminotricyanobiphenyl-Based Azo Dyes

“…Previously amino benzonitriles containing one nitrile group were used as the diazo component in reaction with phenol [15][16][17][18] and 2-naphthol. [17,[19][20] It is known that under certain conditions (low temperature, diluted acid) the products of reaction of diazotized amino benzonitriles with aniline and phenol are diazo ether [16] and triazenes, [21,22] respectively.…”

“…[17,[19][20] It is known that under certain conditions (low temperature, diluted acid) the products of reaction of diazotized amino benzonitriles with aniline and phenol are diazo ether [16] and triazenes, [21,22] respectively. Triazenes may be converted into azo compounds by heating in sulfuric acid.…”

Chiral Photoresponsive Liquid Crystalline Materials Derived from Cyanoazobenzene Central Core: Effect of UV Light Illumination on Mesomorphic Behavior

“…All commercially available reagents were purchased from Merck (Darmstadt, Germany) and TCI Chemicals Europe (Zwijndrecht, Belgium) and used without further purification. Chiral acids: (S)-4-methylhexanoic acid 2a [49] Designed materials were synthesized in high yields by connection of the known building blocks: phenol 1 [41] with acids 2a-c [13,42,43] or acids 3a,b [44][45][46] using DIC-mediated acylation reaction (A) or by acylation using corresponding acid chloride in the presence of DMAP (B) (Figure 2). The method B was used for direct acylation of the central core 1 with (S)-2-octyloxypropanoic acid chloride because of potential racemization of the chiral acid in the DIC-mediated esterification reaction [46][47][48].…”