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.
Heller, Chemische Berichte, 1923, vol. 56, p. 1873
作者:Heller
DOI:——
日期:——
SHISHKIN, V. N.;TANASEJCHUK, B. S.;LAPIN, K. K.;IVKINA, A. A.;BUTIN, K. P+, ZH. ORGAN. XIMII, 1984, 20, N 12, 2588-2599
作者:SHISHKIN, V. N.、TANASEJCHUK, B. S.、LAPIN, K. K.、IVKINA, A. A.、BUTIN, K. P+
DOI:——
日期:——
Shishkin, V. N.; Tanaseichuk, B. S.; Lapin, K. K., Journal of Organic Chemistry USSR (English Translation), 1984, vol. 20, p. 2357 - 2366
作者:Shishkin, V. N.、Tanaseichuk, B. S.、Lapin, K. K.、Ivkina, A. A.、Butin, K. P.