Kinetics and Mechanism of Unimolecular Heterolysis of Framework Compounds: XVII. Solvation Effects in Dehydrobromination of tert-Butyl Bromide, 1-Bromo-1-Methylcyclohexane, and 2-Bromo-2-methyladamantane in Dipolar Aprotic Solvents
作者:A. I. Vasil'kevich、E. A. Ponomareva、G. F. Dvorko
DOI:10.1007/s11178-006-0003-2
日期:2005.11
Dehydrobromination rate of tert-butyl bromide, 1-bromo-1-methylcyclohexane, and 2-bromo-2-methyladamantane grows with increasing polarity and dipole moment of solvents. No correlation was found between rate constants of the process and electrophilicity or ionizing power of the solvents. The observed solvation effects are due mainly to dispersion interactions.
Structure and long-range hyperfine interaction in 2-adamantyl, 5,7-dimethyl-2-adamantyl, and the various 2-substituted radicals (substituent = CHsub 3}, CHsub 2}SiMesub 3}, OSiMesub 3}, SSiMesub 3}, CHsub 2}GeMesub 3}, etc.) were studied by ESR. The origin of the long-range hyperfine interaction is discussed on the basis of the comparison between experimental and theoretical hfs values. The
Kinetics and mechanism of unimolecular heterolysis of framework compounds: XX. Solvation and steric effects in heterolysis of 2-halo-2-alkyladamantanes in sulfolane and butanol
作者:G. F. Dvorko、A. I. Vasil’kevich、K. V. Mikhal’chuk、I. V. Koshchii
DOI:10.1134/s1070428007020066
日期:2007.2
Hetrolysis rate of 2-halo-2-phenyladamantanes in BuOH is 1000 times higher than the heterolysis rate C of 2-halo-2-methyladamantanes. The heterolysis rate in sulfolane does not depend on the substituent, but the phenyl group exhibits a negative steric effect.
Ponomareva, E. A.; Vasil'kevich, A. I.; Tarasenko, P. V., Journal of Organic Chemistry USSR (English Translation), 1988, vol. 24, # 3, p. 490 - 497
作者:Ponomareva, E. A.、Vasil'kevich, A. I.、Tarasenko, P. V.、Dvorko, G. F.
DOI:——
日期:——
Vasil'kevich, A. I.; Ponomareva, E. A.; Dvorko, G. F., Journal of Organic Chemistry USSR (English Translation), 1990, vol. 26, # 11, p. 1956 - 1967
作者:Vasil'kevich, A. I.、Ponomareva, E. A.、Dvorko, G. F.