4729-01-5Relevant academic research and scientific papers
DIRECT IR-SPECTROSCOPIC OBSERVATION OF (1+2)-CYCLOADDITION OF CYCLOPENTADIENYLIDENE TO ETHYLENE IN ARGON MATRIX
Nefedov, Oleg M.,Zuev, Petr S.,Maltsev, Andrey K.,Tomilov, Yuri V.
, p. 763 - 764 (1989)
Cyclopentadienylidene was generated in argon matrix doped with 2percent C2H4 and the direct reaction of the carbene with C2H4 in matrix, when it was annealing from 12 to 40-45 K, was observed.
Study of the Formation of the First Aromatic Rings in the Pyrolysis of Cyclopentene
Herbinet, Olivier,Rodriguez, Anne,Husson, Benoit,Battin-Leclerc, Frédérique,Wang, Zhandong,Cheng, Zhanjun,Qi, Fei
, p. 668 - 682 (2016/02/23)
The thermal decomposition of cyclopentene was studied in a jet-stirred reactor operated at constant pressure and temperature to provide new experimental information about the formation of the first aromatic rings from cyclic C5 species. Experim
Photochemistry of matrix-isolated cyclopentadienylidene revisited
Maier,Endres
, p. 179 - 187 (2007/10/03)
Irradiation of diazocyclopentadiene (1) in a matrix at 10 K with the wavelength λ = 366 nm leads - as already known - to rapid loss of nitrogen and the formation of cyclopentadienylidene (T-2). Upon photoexcitation of cyclopentadienylidene (2) with light of the wavelength λ = 313 nm the (s-E)-(E)-conformer of 2-penten-4-yn-1-ylidene (T-7a) can be detected, which is effectively converted into 3-ethynylcyclopropene (6) by using light with a wavelength of λ = 436 nm. The structural elucidation of T-7a and 6 is based on the comparison of the experimental and calculated IR spectra. Irradiation of cyclopentadienylidene (2), isolated together with the eliminated nitrogen in the same matrix cage, with light of wavelengths longer than 570 nm initiates a partial back-reaction to the starting material, diazocyclopentadiene (1) by recapturing the evolved nitrogen molecule.
The Photo-isomerization of Cyclopentadienone O-Oxide Isolated in Low Temperature Matrices
Dunkin, Ian R.,Shields, Charles J.
, p. 154 - 156 (2007/10/02)
Discrepancies in recent reports from different laboratories on the i.r. spectrum of matrix-isolated cyclopentadienone O-oxide have now been reconciled by showing that two distinct isomers may be formed from cyclopentadienylidene and O2, and that one, a carbonyl oxide, may be converted photolytically into the other, a dioxirane.
Cyclopentadienylidene. A Matrix Isolation Study Exploiting Photolysis with Unpolarized and Plane-Polarized Light
Baird, Mark S.,Dunkin, Ian R.,Hacker, Nigel,Poliakoff, Martyn,Turner, James J.
, p. 5190 - 5195 (2007/10/02)
Diazocyclopentadiene (1) was photolyzed in N2, CO, and other low-temperature matrices.The resulting carbene, cyclopentadienylidene (2), was characterized by its UV and IR spectra, and its thermal dimerization and reaction with CO were observed.Photolysis of 1 with plane-polarized light gave matrices exhibiting linear dichroism.Comparison of dichroic IR and UV spectra revealed that the photolysis proceeds via an excited A1 state of the diazo compound.Plane-polarized irradiation of the corresponding ketene (4) in CO matrices resulted in photoreorientation of the molecules of 4 without significant loss.
