700-13-0Relevant academic research and scientific papers
Kinetics of highly selective catalytic hydrogenation of 2,3,5-trimethylbenzoquinone on Raney nickel catalyst
Mukhopadhyay, Sudip,Chandnani, Kavita H.,Chandalia, Sampatraj B.
, p. 254 - 258 (2000)
This work focuses on the catalytic hydrogenation of 2,3,5-trimethylbenzoquinone (TMBQ) to 2,3,5-trimethylhydroquinone (TMHQ). Kinetic interpretation has been made by studying the important process parameters using Raney nickel as the catalyst. Thus, at 100% TMBQ conversion level, as high as 100% selectivity to TMHQ was accomplished. Experimentation was performed to acquire the most suitable process conditions from the viewpoint of process research and development.
Pd/UiO-66(Hf): A highly efficient heterogeneous catalyst for the hydrogenation of 2,3,5-trimethylbenzoquinone
Cai, Xiaoxiong,Pan, Jianping,Tu, Gaomei,Fu, Yanghe,Zhang, Fumin,Zhu, Weidong
, p. 23 - 26 (2018)
The conversion of 2,3,5-trimethylbenzoquinone (TMBQ) to 2,3,5-trimethylhydroquinone is regarded as one of the most important reactions for the production of vitamin E. Here, we report on a Hf-based metal–organic framework (MOF), UiO-66(Hf), with supported palladium nanoparticles as a highly active, selective, and recyclable catalyst for the direct hydrogenation of TMBQ with H2 under mild reaction conditions. The developed Pd/UiO-66(Hf) catalyst exhibited a marked increase in activity compared with its Pd/UiO-66(Zr) counterpart and conventional Pd/C catalysts. Its excellent catalytic performance is ascribed to the large number of acid sites in the UiO-66(Hf) framework, which promote hydrogenation.
Metal–organic framework derived Pd/ZrO2@CN as a stable catalyst for the catalytic hydrogenation of 2,3,5-trimethylbenzoquinone
Li, Shasha,Pan, Jianping,Wu, Xiaoxue,Fu, Yanghe,Xiao, Qiang,Zhang, Fumin,Zhu, Weidong
, (2019)
Metal–organic frameworks (MOFs) have recently been identified as versatile sacrificing templates to construct functional nanomaterials for heterogeneous catalysis. Herein, we report a thermal transformation strategy to directly fabricate metal Pd nanoclusters inlaid within a ZrO2@nitrogen-doped porous carbon (Pd/ZrO2@CN) composite using Pd@NH2-UiO-66(Zr) as a precursor that was pre-synthesized by a one-pot hydrothermal method. The developed Pd/ZrO2@CN as a robust catalyst delivered remarkable stability and activity to the catalytic hydrogenation of 2,3,5-trimethylbenzoquinone (TMBQ) to 2,3,5-trimethylhydroquinone (TMHQ), a key reaction involved in vitamin E production. The hydrogenation was carried out at 110?°C with 1.0?MPa H2, and it resulted in 98% TMHQ yield as the sole product over five consecutive cycles, outperforming the analogue Pd/ZrO2@C without nitrogen doping templated from Pd@UiO-66(Zr). The excellent catalytic properties of Pd/ZrO2@CN likely originated from the highly stable ultrafine Pd nanoclusters inlaid within ZrO2@CN matrix on account of the strong interaction between N and Pd, as well as on the Lewis acidity of ZrO2, which was beneficial to the hydrogenation.
FORMATION OF ALPHA TOCOPHEROL FROM 2,3,6-TRIMETHYLPHENOL
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, (2021/06/26)
The present invention relates to the formation of α-tocopherol from 2,3,6- tri?methyl?phenol comprising the steps a) the oxidation of 2,3,6-trimethylphenol to 2,3,5-trimethylquinone. b) the reduction of 2,3,5-trimethylquinone to 2,3,5-trimethylhydroquinone c) the condensation of 2,3,5-trimethylhydroquinone and isophytol or a phytol derivative in such a manner that all reaction steps a), b) and c) are performed in cyclic alkylene carbonate solvent.
PROCESS FOR THE PREPARATON OF HYDROQUINONES
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Page/Page column 10, (2021/06/26)
The present invention relates to a process for the manufacturing the hydroquinones from the respective quinones in a cyclic alkyl carbonate using a reducing agent.
FORMATION OF 2,3,5-TRIMETHYLHYDROQUINONE FROM 2,3,6-TRIMETHYLPHENOL
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Page/Page column 12; 13, (2021/06/26)
The present invention relates to the formation of 2,3,5-trimethylhydro- quinone from 2,3,6-tri?methyl?phenol comprising the steps a) the oxidation of 2,3,6-trimethylphenol to 2,3,5-trimethylquinone. b) the reduction of 2,3,5-trimethylquinone to 2,3,5-trimethylhydroquinone in such a manner that both steps a) and b) are performed in cyclic alkylene carbonate solvent.
SYNTHESIS OF CHROMANOL AND 2-METHYL-1,4-NAPHTHOQUINONE DERIVATIVES
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Page/Page column 49-51; 61, (2020/03/05)
The present invention relates to a process for the production of chromanol and 2-methyl-1,4-naphthoquinone derivatives, more specifically to a process for preparing a compound of the general formula (I) or (II) wherein the variables are as defined in the claims and the description.
SYNTHESIS OF CHROMANOL DERIVATIVES
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Page/Page column 40, (2020/03/05)
The present invention relates to a process for the production of chromanol derivatives, more specifically to a process for preparing a compound of the general formula I wherein R1, R2 and R3 independently of each other are selected from hydrogen and methyl, R4 is selected from C-1-C6-alkyl, and X is selected from C1-C20-alkyl and C2-C20-alkenyl.
SYNTHESIS OF CHROMANOL DERIVATIVES
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Page/Page column 41, (2020/03/05)
The present invention relates to a process for the production of chromanol derivatives, more specifically to a process for preparing a compound of the general formula (I) wherein R1, R2 and R3 independently of each other are selected from hydrogen and methyl, R4 is selected from hydrogen and C1-C6-alkanoyl, and X is selected from C1-C20-alkyl and C2-C20-alkenyl.
Selective synthesis of benzoquinones over Cu(ii)-containing propylsalicylaldimine functionalized mesoporous solid catalysts
Selvaraj, Manickam,Assiri, Mohammed A.
, p. 3291 - 3299 (2019/03/13)
The major product, 2,3,5-trimethyl-1,4-benzophenone (TMBO), was synthesised by an eco-friendly liquid-phase oxidation of 2,3,6-trimethylphenol (TMP-OH) over Cu(ii)-containing propylsalicylaldimine (CSA) functionalized mesoporous solid catalysts, namely, CSASBA-15(0.2), CSASBA-15(0.1) and CSAMCM-41(0.2), synthesized using various amounts of copper in a simple post-grafting method using different mesoporous silica materials, e.g., thick-silica walled SBA-15 and thin-silica walled MCM-41. The benzoquinones, i.e., 2,6-disubstituted p-benzoquinones (DSBQs), were also synthesised by the slurry-phase oxidation of di/tri-substituted phenols using the prepared catalysts. A promising chemical treatment was used for the removal of extra-framework copper species from the active surface of CSASBA-15(0.2), and the catalytic activity of the recovered catalyst, i.e. green mesoporous CSASBA-15(0.2) or W-CSASBA-15(0.2), was evaluated. Various reaction parameters, oxidants and solvents were used in this catalytic oxidation. To confirm the catalytic stability, recyclability and hot-catalytic filtration experiments were performed. On the basis of all catalytic results, it is worth noting that the mesoporous CSASBA-15(0.2) is an outstanding and a promising heterogeneous catalyst for the selective synthesis of TMBO and DSBQs, and produces 98% TMBO selectivity with 100% TMP-OH conversion at 353 K for 40 min and 97-99% DSBQ selectivity with 98-100% di/tri-substituted phenols conversion at 330 K for 1-3 h. The green mesoporous catalyst has unprecedented catalytic activity compared with that of other CSA functionalized mesoporous solid catalysts.
