4229-91-8Relevant articles and documents
Photochemistry of the 1,4-Aliphatic Diketones
Lissi, E. A.,Encinas, M. V.,Castaneda, F.,Olea, F. A.
, p. 251 - 255 (1980)
The photochemistry of ketones with general formula RC(=O)CH2CH2C(=O)R', where R and R' represent the methyl, propyl, n-butyl, and isoamyl groups was investigated.The results obtained provide evidence of fast energy migration between the chromophores both in the singlet and triplet excited states.The rate energy migration can be estimated as 2e8 and 3e8 s-1 for the singlet and triplet states, respectively.
Ex situ catalytic upgrading of lignocellulosic biomass components over vanadium contained H-MCM-41 catalysts
Kim, Beom-Sik,Jeong, Chang Seok,Kim, Ji Man,Park, Su Bin,Park, Sung Hoon,Jeon, Jong-Ki,Jung, Sang-Chul,Kim, Sang Chai,Park, Young-Kwon
, p. 184 - 191 (2016/03/08)
H-V-MCM-41 catalysts containing 5, 10, and 30 wt% of vanadium were synthesized and applied to the ex situ catalytic pyrolysis (CP) of three polymeric components of lignocellulosic biomass for the first time. Characterization of the catalysts was performed using N2 adsorption-desorption, XRD, FT-IR, and NH3-TPD. The results of XRD analysis showed that 5 wt% and 10 wt% H-V-MCM-41 catalysts maintained the mesoporous structure, whereas the mesoporous structure was destroyed in 30 wt% H-V-MCM-41 with considerable amount of small V2O5 crystalline outside the framework. NH3-TPD showed that H-V-MCM-41 has mostly weak acid sites and that 10 wt% H-V-MCM-41 had the largest quantity of acid sites due to framework vanadium. In the case of CP of cellulose using Py-GC/MS, 10 wt% H-V-MCM-41 showed the highest catalytic activity for the production of valuable furanic compounds such as furfural because of the enhanced deoxygenation over the acid sites formed on framework vanadium. In the case of CP of xylan as well, 10 wt% H-V-MCM-41 led to the largest yield of mono-aromatics. The production of acetic acid was also promoted by H-V-MCM-41 catalysts. The CP of lignin over H-V-MCM-41 catalysts promoted substantially the production of important feedstock chemicals for the petrochemical industry: phenolics and mono-aromatics.
Laccase-catalyzed stereoselective oxidative ring opening of 2,5-dialkylfurans into 2-ene-1,4-diones using air as an oxidant
Asta, Chimene,Conrad, Juergen,Mika, Sabine,Beifuss, Uwe
supporting information; experimental part, p. 3066 - 3069 (2011/12/21)
The laccase-catalyzed ring opening of 2,5-dimethylfuran using air as an oxidant stereoselectively yields (Z)- or (E)-3-hexene-2,5-dione depending on the mediator employed: with TEMPO the (Z)-3-hexene-2,5-dione is formed, while a combination of TEMPO and violuric acid gives (E)-3-hexene-2,5-dione. The (Z)-selective ring cleavage was extended to a variety of symmetrical and unsymmetrical 2,5-dialkylfurans. The Royal Society of Chemistry.
