Syntheses with nitriles. Part 97: Push-Pull diarylbutadienes and diarylpentadienes: Known chromophores—New facts

Heterogeneous Catalysis for Tandem Reactions

“…An example of a one-pot process on single-site base catalysts is the one-pot synthesis of 1,1-dicyano-2,4-diphenylbutadiene derivatives, which are compounds widely used as disperse dyes and with interesting nonlinear optical properties. , 1,1-Dicyano-2,4-diphenylbutadiene derivatives are conventionally synthesized through two reaction steps. The first step is the synthesis of an α-methylbenzylidenemalonolnitrile derivative through the Knoevenagel condensation between acetophenone derivatives and malononitrile using a mixture of glacial acetic acid and ammonium acetate as catalyst.…”

“…The first step is the synthesis of an α-methylbenzylidenemalonolnitrile derivative through the Knoevenagel condensation between acetophenone derivatives and malononitrile using a mixture of glacial acetic acid and ammonium acetate as catalyst. After separation and purification, the Knoevenagel adduct is reacted with benzaldehyde derivatives in the presence of a homogeneous base to give the corresponding 1,1-dicyano-2,4-diphenylbutadiene derivative; , however, this two-step synthesis of 1,1-dicyano-2,4-diphenylbutadiene derivatives can be performed successfully in one pot using heterogeneous base catalysts by adjusting catalyst basicity and operation conditions (Scheme ).…”

Heterogeneous Catalysts for the One-Pot Synthesis of Chemicals and Fine Chemicals

“…Dicyanomethylene derivative dyes have a variety of applications such as textile dyes, in sensitizing photopolymerization in imaging systems, dye lasers, and optical recording . Particularly, 1,1-dicyanomethylenebutadiene derivatives are used as disperse dyes with interesting nonlinear optical properties. , The conventional synthesis of 1,1-dicyanomethylenebutadiene derivatives involves two reaction steps. The first one is the Knoevenagel condensation between acetophenone derivatives and malononitrile in refluxing benzene and using a mixture of ammonium acetate and glacial acetic acid as a catalyst giving the corresponding α-methylbenzylidenemalonolnitrile which after subsequent separation and purification is reacted with benzaldehyde derivatives to give the corresponding 1,1-dicyanomethylenebutadiene derivative. , Climent el al .…”

“…Particularly, 1,1-dicyanomethylenebutadiene derivatives are used as disperse dyes with interesting nonlinear optical properties. , The conventional synthesis of 1,1-dicyanomethylenebutadiene derivatives involves two reaction steps. The first one is the Knoevenagel condensation between acetophenone derivatives and malononitrile in refluxing benzene and using a mixture of ammonium acetate and glacial acetic acid as a catalyst giving the corresponding α-methylbenzylidenemalonolnitrile which after subsequent separation and purification is reacted with benzaldehyde derivatives to give the corresponding 1,1-dicyanomethylenebutadiene derivative. , Climent el al . reported the two-step synthesis of this type of compound using heterogeneous base catalysts in the absence of solvent and at moderate temperature (Scheme ).…”

Single‐Crystal Organic Microtubes with a Rectangular Cross Section

“…In ICT compounds electron‐donor (D) and electron‐acceptor (A) groups are connected through π conjugation 11. 12 Our approach utilizes the strong D–A dipole–dipole interaction between adjacent DAPMP molecules as the main driving force to direct the growth of DAPMP microtubes in aqueous solution. The process is simple and can be performed at room temperature without any templates or catalysts.…”