[0078] de 2 乙叉非对映异构体 (S Fe SC )- et (R Fe SC )-Cp(CO)(PPh 2 R*) Fe=CHCH 3 + (R*=(S)-methyl-2 丁基) 异类沉淀物的制备Leur 构型 sur Fe et transfert du groupe Ethidene de ces complexes a du 苯乙烯浇注 donner des cis- et trans-methyl-1 phenyl-2 cyclopropanes avec de grands exces d'enantiomeres
Reactivity of the 5-hexenyl radical toward the anion of 2-nitropropane and borohydride anion
作者:Glen A. Russell、Deliang Guo
DOI:10.1016/s0040-4039(01)81573-2
日期:——
The 5-hexenyl radical adds to the anion of 2-nitropropane with a rate constant of ≈ × 106 L/mol-s at 40°. Hydrogen atom abstraction from BH4− occurs more slowly than abstraction from CH3O− and with a rate constant less than 1 × 104 L/mol-s at 30°. The reaction of Δ5- hexenylmercury chloride with sodium borohydride in MeOH/NaOH proceeds via hydrogen abstraction by the hexenyl radical from RHgH and not
5-己烯基在40°时以≈×10 6 L / mol-s的速率常数加到2-硝基丙烷的阴离子上。从BH氢原子抽象4 -比抽象发生更缓慢地从CH 3 ö -并用速率常数小于1×10 4 L /摩尔-S在30℃。的Δ反应5 - hexenylmercury酰氯与硼氢化钠在MeOH / NaOH调节通过夺氢由己烯从生长激素自由基,而不是从前进的NaBH 4。
Trimethylphosphine: anion–molecule reactions and acidity in the gas phase
作者:Joseph J. Grabowski、Paul D. Roy、Robert Leone
DOI:10.1039/p29880001627
日期:——
that trimethylphosphine is more acidic than water. Quantitative measurements are reported for the reaction of trimethylphosphine with atomic oxygen anion and methoxide. These latter two anions exhibit multiple reaction pathways, one of which is proton transfer. From measurements of the rate coefficients of these two reactions and the relative product yields, it is concluded that the gas-phase acidity
An unusual case of proton removal from an oxacarbenium ion
作者:Shmaryahu Hoz、Doron Aurbach
DOI:10.1039/c39840000364
日期:——
Proton loss from an oxocarbenium moiety of ionic bicyclobutane is found to compete appreciably with the capture of the oxocarbenium by alcohol molecules.
发现离子双环丁烷的氧碳鎓部分的质子损失与醇分子捕获氧碳鎓明显竞争。
Gas-phase SN2 and E2 reactions of alkyl halides
作者:Charles H. DePuy、Scott Gronert、Amy Mullin、Veronica M. Bierbaum
DOI:10.1021/ja00180a003
日期:1990.11
nucleophile and for methyl bromide with HS − as the nucleophile; in both cases the overall reaction exothermicity is about 30 kcal mol −1 . Earlier conclusions that these halides react slowly with stronger bases are shown to be in error. In the region where the rates are slow oxygen anions react with the alkyl chlorides and bromides by elimination while sulfur anions of the same basicity react by substitution
已测量甲基、乙基、正丙基、异丙基、叔丁基和新戊基氯化物和溴化物与以下亲核试剂的气相反应的速率系数,按碱度递减的顺序列出:HO - 、CH 3 O - 、F - 、HO - (H 2 O)、CF 3 CH 2 O - 、H 2 NS - 、C 2 F 5 CH 2 O - 、HS - 和Cl - 。对于氯甲烷,反应效率首先显着低于 1,以 HO - (H 2 O) 作为亲核试剂,而对于甲基溴,以 HS - 作为亲核试剂;在这两种情况下,总反应放热度约为 30 kcal mol -1 。这些卤化物与强碱反应缓慢的早期结论被证明是错误的。在速率较慢的区域,氧阴离子通过消除与烷基氯化物和溴化物反应,而相同碱度的硫阴离子通过取代反应。这种差异是由于硫碱的消除速度减慢;与相同碱度的氧阴离子相比,硫阴离子没有增加亲核性
Gas-phase nucleophilic reactions in SO2F2: experiment and theory
作者:Nelson H. Morgon、Harrald V. Linnert、Luiz A.G. de Souza、JoséM. Riveros
DOI:10.1016/s0009-2614(97)00782-3
日期:1997.9
The gas-phase ion-molecule reactions of simple anions (HO−, CH3O−, NH2−) with SO2F2 proceed with rate constants close to the collision limit. The energy surface for the OH−/SO2F2 reaction has been characterized by ab initio calculations using basis functions adapted for a pseudopotential and corrected for anionic systems by the generator coordinate method (GCM) at the QCISD(T)/(ECP/TZV/GCM) level.