Unimolecular rearrangements of carbanions in the gas phase. 2. Cyclopropyl anions
作者:Phillip K. Chou、Gregg D. Dahlke、Steven R. Kass
DOI:10.1021/ja00054a045
日期:1993.1
examined the gas-phase unimolecularrearrangements of a series of substituted cyclopropyl anions (CHXCH 2 CY - ; X=H, Y=Ph, CHO, and CN; X=Y=CO 2 CH 3 ) with a variable temperature flowing afterglow device. The ring-opening barriers range from 19 to ≥36 kcal mol -1 and are well reproduced by ab initio molecular orbital calculations.An analysis of eight monosubstituted cyclopropyl anions reveals that the
The basicity of dipolar aprotic solvent–water–HO– systems with amides and ureas as the organic component has been studied kinetically because previous information is not available, excluding some H– values measured for aqueous dimethylformamide (DMF) and tetramethylurea (TMU). It was found that the increase in basicity with the mole fraction of organic component is at least of the same magnitude as
Reactions of 1,3-Dihaloadamantanes with Carbanions in DMSO: Ring-Opening Reactions to Bicyclo[3.3.1]nonane Derivatives by the S<sub>RN</sub>1 Mechanism
作者:Andrés E. Lukach、Ana N. Santiago、Roberto A. Rossi
DOI:10.1021/jo9620728
日期:1997.6.1
The reactions of 1,3-dihaloadamantanes with various carbanionic nucleophiles were studied. Potassium enolates of acetophenone (2) and pinacolone (10b) and the anion of nitromethane (10a) reacted with 1,3-diiodoadamantane (1a) in DMSO under photostimulation by a free radical chain process to form a 1-iodo monosubstitution product as an intermediate, which undergoes concerted fragmentation to form derivatives
Persistent Room‐Temperature Radicals from Anionic Naphthalimides: Spin Pairing and Supramolecular Chemistry
作者:Wenhuan Huang、Biao Chen、Guoqing Zhang
DOI:10.1002/chem.201902882
日期:2019.9.25
when the N-substitution is a sufficiently strong donor and mediates an intramolecular charge-transfer (ICT) state upon photo-excitation. This work shows that, when the electron-donating ability of the N-substitution is further increased in the presence of a carbanion or phenoxide, spontaneous electron transfer (ET) occurs and results in radicalanions, verified with electron-paramagnetic resonance (EPR)
X-ray structure and electrophilic reactivity of a cationic, chiral tungsten(II) methylene complex
作者:Aase S. Jepsen、Neil J. Vogeley、Peter S. White、Joseph L. Templeton
DOI:10.1016/s0022-328x(00)00708-7
日期:2001.1
The structure of a tungsten(II) methylene complex, [Tp′(CO)(PhCCMe)WCH2][BAr′4] (2a), was obtained by taking advantage of the stabilizing, weakly coordinating counterion, BAr′4−, to form X-ray quality single crystals. The electrophilic reactivity of [Tp′(CO)(PhCCMe)WCH2][PF6] (2b) was surveyed with both neutral nucleophiles (triphenylphosphine and pyridine) and anionic nucleophiles (formed by deprotonation