126-39-6Relevant articles and documents
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Nayanov et al.
, (1975)
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Bauduin,Pietrasanta
, p. 4225,4230 (1973)
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Synthesis of 1-bromo-3-buten-2-one
Westerlund, Andreas,Carlson, Rolf
, p. 4035 - 4042 (1999)
A synthetic method for 1-bromo-3-buten-2-one is given. The compound is prepared through the following sequence: 2-butanone to 2-methyl-2-ethyl-1,3- dioxolane to 2-(1-bromoethyl)-2-bromomethyl-1,3-dioxolane to 2-bromomethyl-2- vinyl-1,3-dioxolane to the final product. Full experimental details including spectral data are given.
Solvothermal synthesis, structure and catalytic activity of a mixed-valence CuI/CuII complex with 1-D chain structure
Han, Zhi-Ping,Li, Yahong
, p. 73 - 76 (2012)
A complex of composition [CuI4CuII(mtpo) 4(H2O)2Cl2]n (1) was synthesized from reaction of Hmtpo (Hmtpo = 5-methyl-[l,2,4]-triazolo-[l,5-a]- pyrimidin-7-o1) with one equivalent of CuCl2·2H2O in water at 100 °C under autogenous pressure. Complex 1 was fully characterized by X-ray single crystal diffraction, elemental analysis and IR spectroscopy. X-ray analysis reveals that complex 1 is a mixed-valence coordination polymer and displays 1-D chain structure. Compound 1 was able to heterogeneously catalyze the ketalization reaction of 2-butanone and ethylene glycol to afford 2-ethyl-2-methyl-[1,3]-dioxolane in excellent yield under mild conditions.
First Example of a Nonanuclear Silver Sulfate Hybrid Cluster: Green Approach for Synthesis of Lewis Acid Catalyst
Paul, Avijit Kumar,Naveen, Kumari,Kumar, Nikhil,Kanagaraj, Rajendiran,Vidya,Rom, Tanmay
, p. 6411 - 6416 (2018)
Finding a high nuclearity hybrid framework with novel structure and properties by an environmentally benign approach is a really challenging task. Herein, a green strategy for synthesis of a new inorganic-organic hybrid framework solid has been described. The framework contains silver sulfate clusters with nine different silver ions with shortest silver-silver connectivity. The present compound is the first example of nonanuclear silver sulfate hybrid framework with a new topology. The hybrid solid compound shows a highly active Lewis acidic nature for the various heterogeneous catalytic reactions such as cyanosilylation, ketalization, and esterification with quantitative transformation and recyclability.
Facile preparation of ionic liquid functionalized magnetic nano-solid acid catalysts for acetalization reaction
Wang, Ping,Kong, Aiguo,Wang, Wenjuan,Zhu, Haiyan,Shan, Yongkui
, p. 159 - 164 (2010)
The facile two-step preparation procedure of a novel magnetic nano-solid acid catalyst is described, which includes grafting an ionic liquid onto Fe 3O4 nanoparticles, followed by the sulfonation of phenyl groups in the ionic liquid. The catalytic performance of this novel material has been systematically studied in the acetal formation of benzaldehyde and ethylene glycol. The experimental results testify this catalyst possesses high catalytic activity with a yield of 97% under mild reaction conditions. Furthermore, the catalyst is readily separated using a permanent magnet and it is reusable without any significant decrease in catalytic activity.
One-pot synthesis of ordered mesoporous zirconium oxophosphate with high thermostability and acidic properties
Miao, Zhichao,Xu, Leilei,Song, Huanling,Zhao, Huahua,Chou, Lingjun
, p. 1942 - 1954 (2013)
A series of mesoporous zirconium oxophosphate (M-ZrPO) with different P/Zr molar ratios (0-1.25) has been prepared via a facile one-pot evaporation-induced self-assembly (EISA) strategy. After removing the structure-directing agents, the M-ZrPO with large specific surface area (160 m2 g-1), big pore volume (0.26 cm3 g-1) and narrow pore size distribution (5.64 nm) has been obtained. Small-angle X-ray diffraction (SXRD) and transmission electron microscopy (TEM) results showed that these materials had ordered mesoporous structure. With the increase of P/Zr, the textural properties of M-ZrPO could be improved. Moreover, the ordered mesostructure could be maintained even when treated at 800°C, indicating the M-ZrPO had attractive thermal stability. NH3-TPD and pyridine-IR analyses showed the presence of abundant Broensted and Lewis acid sites in the material. The M-ZrPO has been used successfully as solid acid catalyst and showed excellent performance in the ketalization reaction.
Interpenetrated and Catenated Zinc Thiosulfates Frameworks with dia and qtz Nets: Synthesis, Structure, and Properties
Karthik, Rajendran,Natarajan, Srinivasan
, p. 2239 - 2248 (2016)
Reactions between Zn(NO3)2·6H2O, Na2S2O3, 4,4′-bipyridine (bpy), 1,2-bis(4-pyridyl)ethene (bpe), 1,2-bis(4-pyridyl)ethane (bpa), and 1,3-bis(4-pyridyl)propane (bpp) under solvothermal conditions resulted in four new zinc thiosulfate hybrid compounds. Compound I has four-membered zinc thiosulfate rings connected by the ligand, 1,3-bis(4-pyridyl)propane (bpp) forming a two-dimensional structure. Compounds II-IV have one-dimensional zinc thiosulfate chains connected by the ligands, bpy (II), bpe (III), and bpa (IV) giving rise to three-dimensional structures. All the four-structures exhibit 3-fold interpenetration. Proton conductivity studies indicate reasonable proton mobility at 34 °C and at 98% relative humidity. The compounds also exhibit Lewis acid character and good photocatalytic activity for the decomposition of cationic dyes.
Preparation of a novel solid acid catalyst with Lewis and Bronsted acid sites and its application in acetalization
Du, Yijun,Shao, Linjun,Luo, Lingyan,Shi, Si,Qi, Chenze
, p. 157 - 163 (2014)
A novel melamine-formaldehyde resin (MFR) supported solid acid with Lewis and Bronsted acid sites was synthesized through the immobilization of acidic ionic liquid and cuprous ion on MFR. The scanning electron microscopy (SEM) characterization showed that addition of PEG-2000 in the synthesis of MFR could promote the formation of regular particles with diameters around 3.7 μm. The XRD pattern demonstrated that some cuprous ions were aggregated. The catalytic performance of this acid catalyst was evaluated by acetalization. The results showed that the catalytic activity of MFR with Bronsted acid could be improved by addition of Lewis acid. The solid acid was very efficient for the acetalization of carbonyl compounds and diols with moderate to excellent yields and there was no loss of catalytic activity even after being recycled for 6 runs. TUeBITAK.
An efficient procedure for protection of carbonyls in Br?nsted acidic ionic liquid [Hmim]BF4
Wu, Hai-Hong,Yang, Fan,Cui, Peng,Tang, Jie,He, Ming-Yuan
, p. 4963 - 4965 (2004)
Protection of carbonyls as acetals or ketals using Br?nsted acidic ionic liquid [Hmim]BF4 as catalyst as well as solvent was investigated. Satisfactory results were obtained for the protection of carbonyls as cycloacetals or ketals with diols. The product can be separated conveniently from the reaction system, and the ionic liquid can be reused after removal of water.
Robust acidic pseudo-ionic liquid catalyst with self-separation ability for esterification and acetalization
Shi, Yingxia,Liang, Xuezheng
, p. 1413 - 1421 (2019/05/04)
The novel acidic pseudo-ionic liquid catalyst with self-separation ability has been synthesized through the quaternization of triphenylphosphine and the acidification with silicotungstic acid. The pseudo-IL showed high activities for the esterification with average conversions over 90%. The pseudo-IL showed even higher activities for acetalization than traditional sulfuric acid. The homogeneous catalytic process benefited the mass transfer efficiency. The pseudo-IL separated from the reaction mixture automatically after reactions, which was superior to other IL catalysts. The high catalytic activities, easy reusability and high stability were the key properties of the novel catalyst, which hold great potential for green chemical processes.