558-21-4Relevant academic research and scientific papers
Ester Cleavage in Superacid Media Involving Diprotonated Gitonic Carboxonium Dications
Olah, George A.,Hartz, Nikolai,Rasul, Golam,Burrichter, Arwed,Prakash, G. K. Surya
, p. 6421 - 6427 (2011/05/18)
The reactivity of protonated and methylated methyl ester in superacidic media was investigated by experiment and theory.Protonated methyl acetate was found to undergo slow acyl oxygen cleavage at -78 deg C in FSO3H/SbF5/SO2 solution to give acetyl cation and methyloxonium ion. 1,1-Dimethoxyethyl cation (methylated methyl acetate) was found to undergo slow methyl exchange in CD3SO3F/SbF5 solution.The reaction of 1,1-dimethoxyethyl cation with toluene in the presence of trifluoromethanesulfonic acid at -78 deg C gave acylation in 4percent yield.Theoretical calculations at the MP4(SDTQ)/6-31G*//MP2/6-31G* level of theory were performed to find stationary points on the potential energy surface of the mono- and diactivated ester system.Based on the available evidence a new mechanism for the acid-catalyzed ester cleavage in superacidic media is proposed.
A Photoelectron Spectroscopic Study of the Ground States of CH2F+ and CD2F+
Andrews, Lester,Dyke, John M.,Jonathan, Neville,Keddar, Noureddine,Morris, Alan,Ridha, Abed
, p. 2364 - 2368 (2007/10/02)
The fluorine atom/methyl fluoride reaction has been studied by photoelectron spectroscopy.A new product band with vibrational components at 9.04 +/- 0.01 eV adiabatic and 9.22 +/- 0.01 eV vertical ionization energies is assigned to the CH2F free radical.The ν'= 0-1 vibronic separation measured as 1450 +/- 30 cm-1 is due to the C-F stretching fundamental of the ground state of CH2F+; this vibronic interval was 1530 +/- 30 cm-1 for CD2F+.The positive deuterium shift for CH2F+ is due to interaction with the H-C-H bending mode, which shifts below the C-F stretching mode on deuteration.The substantial increase in the C-F stretching modes for CH2F+ and CD2F+, as compared to 1163- and 1193-cm-1 values for the CH2F and CD2F free radicals in solid argon, respectively, is due to increased net C-F bonding in the cations.
