65144-74-3Relevant academic research and scientific papers
Gas-phase identification of (Z)-1,2-ethenediol, a key prebiotic intermediate in the formose reaction
Alessandrini, Silvia,Barone, Vincenzo,Bizzocchi, Luca,Dore, Luca,Gazzeh, Houda,Guillemin, Jean-Claude,Melosso, Mattia,Puzzarini, Cristina,Rivilla, Víctor M.,Tonolo, Francesca
supporting information, p. 2750 - 2753 (2022/03/07)
Prebiotic sugars are thought to be formed on primitive Earth by the formose reaction. However, their formation is not fully understood and it is plausible that key intermediates could have formed in extraterrestrial environments and subsequently delivered
Comparative studies of the photocatalytic and microwave -assisted degradation of alizarin red using ZnO/poly(1- naphthylamine) nanohybrids
Riaz, Ufana,Ashraf,Budhiraja, Vaibhav,Aleem, Sadaf,Kashyap, Jyoti
, p. 259 - 267 (2016/01/20)
Semiconductors such as ZnO and TiO2 have been extensively utilized in the photocatalytic degradation of dyes. However till date, no study has been reported to compare the catalytic efficiency of such organic-inorganic hybrids under UV light and microwave irradiation separately. The present work reports the synthesis of poly(1-naphthylamine)/ZnO nanohybrids. The structure and morphology of the synthesized nanocomposites were characterized using FT-IR, UV, XRD, TEM and Cyclic voltammetry analyses. The dye degradation studies were done separately in a photochemical reactor and in laboratory microwave oven and the fragments were identified using LC-MS technique. Results showed that under microwave irradiation, the efficiency of ZnO/PNA as catalyst was higher as compared to UV irradiation. Higher extent of ?OH radical generation was confirmed in microwave as compared to UV irradiation which was found to be responsible for the high rate of degradation of dye solution. A plausible degradation pathway was proposed.
Investigation of the mechanism of dissociation of glycolaldehyde dimer (2,5-dihydroxy-1,4-dioxane) by FTIR spectroscopy
Yaylayan, Varoujan A.,Harty-Majors, Susan,Ismail, Ashraf A.
, p. 31 - 38 (2007/10/03)
Glycolaldehyde represents the simplest α-hydroxycarbonyl moiety - a common structural feature of reducing sugars. It exists in solid state, only in crystalline dimeric form as 2,5-dihydroxy-1,4-dioxane. However, in solution phase or during heating, it dissociates into different dimeric and monomeric forms. FTIR spectroscopy was used to study the effect of temperature, pH and solvent on the dissociation and chemical transformations of glycolaldehyde. The infrared spectra were recorded in different solvents as a function of time and temperature (both during heating and cooling cycles) between 30 and 85°C. During heating, glycolaldehyde cyclic dimer generated two bands in the carbonyl region, one at 1744 cm-1 and the other at 1728 cm-1. These bands increased during the heating cycle and decreased during the cooling cycle. The data indicated that the glycolaldehyde cyclic dimer (2,5-dihydroxy-1,4-dioxane) undergoes a ring opening to form the acyclic dimer (1728 cm-1) that can recyclize into the 2-hydroxymethyl-4-hydroxy-1,3-dioxolane structure. The acyclic dimer can also dissociate into monomeric glycoladehyde (1744 cm-1) in equilibrium with the enediol form (1703 cm-1). There is evidence to indicate oxidation of glycolaldehyde into glycolic acid during heating, in either neutral or basic aqueous solutions.
Energy Barriers to the Diels-Alder Cycloadditions and Cycloreversions of Cation-radicals in the Gas Phase
Turecek, Frantisek,Havlas, Zdenek
, p. 1011 - 1014 (2007/10/02)
The mechanism of the retro-Diels-Alder reaction of substituted bicyclohept-2-ene cation-radicals can be related to the energetics of the fragmentation.Concerted synchronous or asynchronous mechanisms are operative in reactions which occur at their thermochemical thresholds.The reverse process, the Diels-Alder reaction of a cation-radical with a molecule, has a negligible activation energy for symmetrical and slightly unsymmetrical systems, +* + cyclopentadiene, +* + vinyl alcohol, +* + cyclopentadiene, and +* + cyclopentadiene.The retro-Diels-Alder decomposition of the highly unsymmetrical 2-vinylbicyclohept-5-en-2-ol cation-radical proceeds in two steps and overcomes a barrier of 58-67 kJ mol-1 above the thermochemical threshold.The effect of bond-dissociation energies on the reaction mechanism is discussed.
REACTIONS RETRODIENIQUES XIII - THERMOLYSE ECLAIR DES (Z) ET (E) DIHYDROXY-11,12 ETHANO-9,10 ANTHRACENES : SYNTHESE DES (Z) ET (E) ETHENEDIOLS-1,2.
Lasne, Marie-Claire,Ripoll, Jean-Louis
, p. 1587 - 1588 (2007/10/02)
The flash vacuum thermolysis of diols 3 and 4 affords, via a retro-Diels-Alder cleavage, the simplest enediols 1 and 2 for which the NMR and IR spectra as well as their thermal evolution are reported.
