A flame-retardant compound, a process for forming a flame-retardant compound, and an article of manufacture. The flame-retardant compound includes a tetrazine moiety and at least one ligand comprising a brominated moiety. The process includes providing starting materials, which include a nitrile compound, a bromine source, and hydrazine. The process also includes reacting the starting materials to form a tetrazine flame retardant. The article of manufacture includes a polymer and a flame-retardant compound having a tetrazine moiety and at least one ligand comprising a brominated moiety.
作者:V. N. Shishkin、I. V. Esina、K. K. Lapin、K. P. Butin
DOI:10.1023/a:1016382008923
日期:——
Polybromobenzenes C6Br5X (X = Br, F, CN, NO2) react with primary amines (methylamine and cyclohexylamine) to give nucleophilic substitution products; reactions of the same substrates with secondary amines (dimethylamine, diethylamine, piperidine, and morpholine) are accompanied by hydrodebromination processes.
Regioselectivity of methoxydebromination of substituted pentabromobenzenes C6Br5X in pyridine
作者:V. N. Shishkin、K. K. Lapin、S. A. Shabarina、K. P. Butin
DOI:10.1007/bf01151297
日期:1995.9
The kinetics and regioselectivity of methoxydebromination of some substituted pentabromobenzenes C(6)Br(5)X (X = NO2, CN, NH2, MeNH, and MeO) were studied in pyridine at 115 degrees C. The partial rate factors (k(f)) were calculated for different positions of the polybrominated ring in these compounds. The effect of substituents X on methoxydebromination at the meta- and para-positions is satisfactorily described only by the Hammett substituent constants (rho = 2.22, r = 0.96). This allows one to conclude that direct polar conjugation of the substituents contributes only slightly to the transition state of the reaction. The ortho-bromine atoms have a significant steric effect.