15650-80-3Relevant academic research and scientific papers
Structures of Product Ions C6H7(+) and C6H9(+) of Ion-Molecule Reactions with Allyl Bromide
Zhu, Zhiqing,Gaeumann, Tino
, p. 1111 - 1118 (2007/10/02)
The ion-molecule reactions of allyl bromide with the molecular ion of allyl bromide and with its major fragment, the allyl ion, yield the C6H7(+) and C6H9(+) ions.The structure of these product ions was explored by means of photofragmentation with laser light in the 10 μm region and by proton transfer reaction to selected reagents.These product ions were also formed by other reactions and their reactivities compared.In both cases the presence of at least two populations is demonstrated.For C6H9(+) these two populations are initially present, whereas for C6H7(+) an isomer is formed by the infrared light before the loss of H2.When this ion is produced by photofragmentation of C6H9(+), at least one third, stable isomer is formed.Two isomers of C6H5(+) are formed in the photofragmentation of C6H7(+), but only one form photofragments further by loss of C2H2.The use of non-linear least-squares fitting does not allow definite conclusions to be drawn concerning the kinetics of the consecutive photofragmentations.
Reactions of Some Cyclic Ethers in Superacids
Baig, Mirza Azam,Banthorpe, Derek V.,Carr, Graham,Whittaker, David
, p. 1981 - 1986 (2007/10/02)
The reactions of some epoxides and tetrahydrofuran derivatives in superacidic media have been studied.The tetrahydrofurans decompose only at 0 deg C or above, yielding, in some cases, unsaturated carbocations which react to give carbocyclic products, though many yield only tar.Cyclohexene oxides decompose more readily; unsubstituted, they slowly form an allylic ion; with one carbon at the epoxide link substituted they yield the ketone, and with both carbons substituted they give the ring-contracted aldehyde.Limonene 1,2-oxide behaves in a similar manner, though yielding small amounts of the ring-contracted protonated aldehyde (10).Reaction of geraniol 2,3-oxide is initially similar but the intermediate is intercepted intramolecularly to yield the hydroxy-iridoid ethers, 3,3,6β-trimethyl-cis-perhydrocyclopentafuran and 3,3,6α-trimethyl-cis-perhydrocyclopentafuran.Protonation of cyclohexene oxide or norbornene oxide yields onium salts, stable at -70 deg C, which show the addition to be either unsymmetrical (i.e. edge protonation) or to take place in two different positions.
Ring-Inversion Barriers for the 3- and 4-Cyclohexenyl Radicals in Solution
Berson, J. A.,Griller, D.,Owens, K.,Wayner, D. D. M.
, p. 3316 - 3319 (2007/10/02)
Ring-inversion barriers for the 3- and 4-cyclohexenyl radicals were investigated by an electron paramagnetic resonance (EPR) method and were found to be 7.0 +/- 0.9 and 2.4 +/- 0.5 kcal mol-1 in fluid solution.The inversion motions and the magn
Degenerate Cyclopropylcarbinyl Cation Rearrangement in 2-Bicycloalkyl Cations
Olah, George A.,Prakash, G.K.Surya,Rawdah, Tarik N.
, p. 965 - 969 (2007/10/02)
The ionization of bicycloalkan-2-ols in superacids (SbF5, FSO3H, FSO3H-SbF5) to the corresponding carbocations has been investigated by 13C NMR spectroscopy over the temperature range of 0 to -140 deg C.The bicyclic system, n = 4, gave a degenerate
