A theoretical study on gas-phase reactions of CF3CH=CF2 with …
网页2023年8月1日 · Results reveal that the OH-addition/elimination reaction of P1 (CF 2 O + CF 3 CH 2) and P7 (CHF 2 + CF 3 CHO) are the dominant reaction pathways. Other pathways on the potential energy surface (PES) are less competitive from the thermodynamic and kinetic consideration.
Difluorocarbene - Wikipedia
网页Thermal decomposition of sodium chlorodifluoroacetate in the presence of triphenylphosphine and an aldehyde allows for a Wittig-like reactions [5] In this case, (C 6 H 5) 3 P=CF 2 is proposed as an intermediate. Alternatively, dehydrohalogenation of chlorodifluoromethane or bromodifluoromethane using alkoxides or …
Difluorocarbene Generation from TMSCF3: Kinetics and …
网页The mechanism of CF 2 transfer from TMSCF 3 ( 1 ), mediated by TBAT (2–12 mol %) or by NaI (5–20 mol %), has been investigated by in situ/stopped-flow 19 F NMR spectroscopic analysis of the kinetics of alkene difluorocyclopropanation and competing TFE/ c- C 3 F 6 /homologous perfluoroanion generation, 13 C/ 2 H KIEs, LFERs, CF 2 transfer ...
Gas-Phase Reaction between CF2O and CF3C (O)OH: …
网页2019年5月3日 · The reaction proceeds homogeneously in the gas phase through the formation of a reaction intermediate, here characterized as CF 3 C(O)OC(O)F (detected for the first time in this work), the major final products being CF 3 C(O)F, HF, and CO 2. We demonstrate that the reaction is first-order with respect to …
Rate constants for the reactions of OH radicals with CF
网页2018年3月20日 · In this paper, we firstly evaluate the reaction rates of the five CF 3 CX=CYZ type halogenated alkenes with OH radicals and the infrared absorption spectra, and consequently estimate the atmospheric lifetime with respect to the reaction with OH radicals, GWP, ODP, and POCP.
Thermal Decomposition of CF3 and the Reaction of CF2 + OH …
网页Abstract. The reflected shock tube technique with multipass absorption spectrometric detection (at a total path length of ∼1.75 m) of OH-radicals at 308 nm has been used to study the dissociation of CF 3 -radicals [CF 3 + Kr → CF 2 + F + Kr (a)] between 1803 and 2204 K at three pressures between ∼230 and 680 Torr.
Theoretical studies on the reaction mechanism of CF3CFCF2 with …
网页2013年6月1日 · The reaction mechanisms of OH radicals with CF 3 CF CF 2 in the absence and presence of O 2 /NO have been investigated theoretically by a detailed PES calculation at the M06-2X/aug-cc-pVDZ and MCG3 (single-point) levels. The CF 3 CF CF 2 + OH reaction proceeds via addition to form two different intermediates IM1 CF 3 CFCF 2 (OH) and IM2 CF 3 CF ...
Dialkylation of CF2 unit enabled by cobalt electron-shuttle
网页2024年9月10日 · In this context, we herein report a metal electron-shuttle catalyzed, modular synthetic methodology for difluoroalkylated compounds by assembling two C(sp3) fragments across CF2 unit in a single...
The Wolff-Kishner Reaction - Chemistry LibreTexts
网页Reaction with a Base and Heat Converts a Hydrazone to an Alkane. Hydrazones can be further converted to the corresponding alkane by reaction with a base, usually KOH, and heat. Typically a high boiling point solvent, such as ethylene glycol, is used to provide the high temperatures needed for this reaction to occur.
High-Accuracy Measurements of OH Reaction Rate Constants and …
网页2010年4月29日 · Rate constants for the gas phase reactions of OH radicals with two isomers of tetrafluoropropene, CH 2 ═CF−CF 3 ( k1) and trans -CHF═CH−CF 3 ( k2 ); were measured using a flash photolysis resonance-fluorescence technique over the temperature range 220 to 370 K. The Arrhenius plots were found to exhibit a noticeable curvature.
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