16434-26-7Relevant academic research and scientific papers
Synthesis and characterization of azo compounds and study of the effect of substituents on their liquid crystalline behavior
Al-Hamdani, Uhood J.,Gassim, Tarik E.,Radhy, Howraa H.
experimental part, p. 5620 - 5628 (2010/12/18)
In this paper we present six select mesomorphic azo compounds distinguished by the presence of diverse substituents on a central benzene nucleus. All the synthesized compounds exhibit enantiotropic mesophases. The mesomorphic properties of the substituted compounds were compared with those of the unsubstituted parent compound to evaluate the effect of the nature and position of the substituents on mesomorphism.
Reaction of Haloazoxybenzenes with Sulfuric Acid
Shimao, Ichiro,Fujimori, Ken,Oae, Shigeru
, p. 546 - 550 (2007/10/02)
Treatment of 4,4'-dihaloazoxybenzenes with sulfuric acid afforded 4,4'-dihaloazobenzenes (6) as the major product and 5-halo-2-(p-halophenylazo)phenols, the Wallach rearrangement products as minor products, besides 2-halo-5-(halophenylazo)phenols, 2-halo-4-(p-halophenylazo)phenols, and 4-(p-halophenylazo)phenols as abnormal rearrangement products.The reaction of fluoro compounds gave the azophenols (3a or 5a) in the best yields.However, the ratio of 3a to 5a was found to vary with the concentration of sulfuric acid.Treatment of 4-haloazoxybenzenes with sulfuric acid gave 4-(p-halophenylazo)phenols and 4-haloazobenzenes (13) as major products together with 2-(p-halophenylazo)phenols and 5-halo-2-(phenylazo)phenols as minor products.Yields of reduction products 6 and 13 increased as the halosubstituent became heavier in the following sequence: F -> Cl -> Br -> I.
