β-Hydrogen Elimination of Ionic Butylzinc Complexes
摘要:
Gas-phase experiments on deuterium-labeled BuZn-(TMEDA)(+) (TMEDA = N,N,N',N'-tetramethylethylenediamine) prove that the loss of butene from this species corresponds to a beta-H elimination. Quantum-chemical calculations corroborate this finding and furthermore predict that the fragmentations of related cationic butylzinc complexes as well as of Bu3Zn- follow similar mechanisms.
Volatile alkylmercury hydrides are obtained by reduction of the corresponding mercury chlorides and purified by trap-to-trap distillation. The chemical reactivity of these compounds, obtained in pure form, has been studied towards various substrates sensitive to reducing agents.
Aqueous organometallic chemistry: the mechanism of catalytic hydrogenations with chlorotris(1,3,5-triaza-7-phosphaadamantane) rhodium(I)
作者:Ferenc Joó、Levente Nádasdi、Attila Cs. Bényei、Donald J. Darensbourg
DOI:10.1016/0022-328x(95)05946-m
日期:1996.4
The water-soluble phosphine complex of Rh(I), RhCl(PTA)3 (1) was shown to be an active catalyst for the hydrogenation of various olefinic and oxo-acids, as well as of allyl alcohol and 4-sulfostyrene in aqueous solution under mild conditions. Detailed kinetic investigations were carried out with crotonic acid and allyl alcohol as substrates. The rate of hydrogenation of both compounds showed a sharp
DMITREVSKAYA, L. I.;KURKOVSKAYA, L. N.;PONOMARENKO, N. K.;USOROV, M. I.;S+, ZH. ORGAN. XIMII, 1983, 19, N 11, 2278-2281
作者:DMITREVSKAYA, L. I.、KURKOVSKAYA, L. N.、PONOMARENKO, N. K.、USOROV, M. I.、S+
DOI:——
日期:——
Parallel behavior in kinetic and NMR effects: secondary deuterium isotope effects on the alkaline hydrolysis of esters
作者:Michael S. Matta、Dale E. Broadway、Michele K. Stroot
DOI:10.1021/ja00250a026
日期:1987.8
948 +/- 0.004. The activation energies of the esterolyses of the isotopically light esters follow a similar pattern, as do the /sup 13/C NMR nuclear shieldings in CDCl/sub 3/ of the isotopically light parent carboxylic acids (20.9, 27.4, 35.9, and 33.8 (ppm)) and /sup 13/C NMR one-bond isotope shifts produced by disubstitution of deuterium for hydrogen at the ..cap alpha..-carbons of the acids (0.45,
β-Hydrogen Elimination of Ionic Butylzinc Complexes
作者:Konrad Koszinowski、Christina Müller、Harald Brand、Julia E. Fleckenstein
DOI:10.1021/om300698b
日期:2012.10.22
Gas-phase experiments on deuterium-labeled BuZn-(TMEDA)(+) (TMEDA = N,N,N',N'-tetramethylethylenediamine) prove that the loss of butene from this species corresponds to a beta-H elimination. Quantum-chemical calculations corroborate this finding and furthermore predict that the fragmentations of related cationic butylzinc complexes as well as of Bu3Zn- follow similar mechanisms.