Thermochemical aspects of the formation of solvated anions from ethers under ion cyclotron resonance conditions
摘要:
AbstractThe reactions of [NH2]−, [OH]− and [F]− with diethyl ether, vinyl ethyl ether and vinyl acetate have been investigated, and the relative yields of solvated and unsolvated product ions have been discussed in terms of the thermochemistry of these reactions and the effect this has on the lifetime of the reaction complex.
Synthesis of 3-trifluoromethylfurans from β,β-bis(trifluoromethyl)α,β-unsaturated ketones and tin(<scp>II</scp>) chloride
作者:Klaus Burger、Brigitte Helmreich
DOI:10.1039/c39920000348
日期:——
A new building block strategy for the synthesis of 3-trifluoromethyl-substituted furans 9 and 10 is described from β,β-bis(trifluoromethyl)α,β-unsaturated ketones 2via reductive fluoride elimination and 1,5-electrocyclization with elimination.
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.
3-dichlorobistrifluoromethyl- (I) and 1,3-dichlorobistrifluoromethyl-cyclopropene (II). The 3,3-dichloro-compound (I) is isomerised to (II) by heat, light, or chemical catalysis, but high yields of either pure cyclopropene may be obtained by modification of the reaction conditions. The cyclopropenium ion (III) is formed when either (I) or (II) is treated with antimonypentafluoride.
A mechanistic change in the alkaline hydrolysis of esters of fluorene-9-carboxylic acid
作者:Manoochehr Alborz、Kenneth T. Douglas
DOI:10.1039/c39800000728
日期:——
The Brønsted leaving group (β1g) plot for the alkalinehydrolysis of fluorene-9-carboxylate esters in the pH region corresponding to the existence of the ester anion shows a minimum flanked by a region of high negative β1g(-1·01), corresponding to an E1cb pathway and, for esters of pK1g > 9·5, a region of positive β1g(+0·11).