149550-23-2Relevant articles and documents
Visible-Light Photoredox-Catalyzed α-Regioselective Conjugate Addition of Allyl Groups to Activated Alkenes
Gontala, Arjun,Woo, Sang Kook
, p. 3223 - 3228 (2020)
The α-regioselective conjugate addition of allyl groups to activated alkenes is a poorly explored area of research. Herein, we report an α-adduct and (E)-isomer selective conjugate addition of allylsilanes to activated alkenes by visible-light photoredox catalysis. The reaction involves allylic radicals that can be generated from allylsilanes through a photoinduced single-electron transfer mechanism. (Figure presented.).
An efficient and recyclable acid-base bifunctional core-shell nano-catalyst for the one-pot deacetalization-Knoevenagel tandem reaction
Wang, Zitao,Yuan, Xiaofeng,Cheng, Qi'An,Zhang, Tichun,Luo, Jun
, p. 11610 - 11615 (2018)
A novel magnetic nanoparticle supported acid-base bifunctional catalyst was synthesized by anchoring [3-(2-aminoethyl)aminopropyl]triethoxysilane and sulfonic acid successively onto the surface of silica-coated Fe3O4 nanoparticles. The as-prepared nanoparticle catalyst was used as a quasi-homogeneous and recyclable catalyst for the one-pot deacetalization-Knoevenagel tandem reaction of benzaldehyde dimethylacetals and malononitrile. It showed high catalytic activity because the reaction proceeded smoothly and afforded benzylidenemalononitriles in excellent yields. Besides, it showed synergistic effect and facilitated the mass transfer process during the tandem reaction because the two catalytic moieties were connected together on the same MNP. Moreover, the catalyst can be readily recovered under an external magnetic field and reused without any significant loss of the catalytic activity after six runs.
Synthesis of Fe3O4@P4VP@ZIF-8 core-shell microspheres and their application in a Knoevenagel condensation reaction
Miao, Zongcheng,Yang, Fengxia,Luan, Yi,Shu, Xin,Ramella, Daniele
, p. 27 - 32 (2017)
In this work, a core-shell magnetic composite Fe3O4@P4VP@ZIF-8 microspheres were successfully designed and synthesized. A polymerization approach on the surface of pre-made Fe3O4 microspheres was employed for th
Nickel?alkyne?functionalized metal?organic frameworks: An efficient and reusable catalyst
Chen, Huixin,Cheng, Hua,Li, Jilin,Li, Wei,Liao, Shengyun,Liu, Xin,Ning, Liangmin,Shao, Liming,Tang, Siyuan
, (2021/06/15)
Electron-donating groups in the robust MOF motif are able to provide an excellent catalytic platform, therefore obtaining site-isolated metal sites. In this study, the terminal alkyne is firstly introduced into UiO-66-type metal-organic frameworks (UiO-66-alkyne). Herein, to further study the application potential of this material, a covalently bonded nickel catalyst based on the alkynyl-tagged UiO-66-alkyne has been prepared and afforded us unprecedented highly dispersed and highly efficient catalytic active species. Meanwhile, this nickel-contained catalyst method for joining metals provided an alternative pathway regarding catalyst designing. With UiO-66-alkyne-Ni, the heterogeneous transformation of homogeneous catalysts is realized. Using benzaldehyde and malononitrile as starting materials, we were able to catalyze the Knoevenagel condensation within 45 min under room temperature with yield (> 99 %). Moreover, the recovery rate of the UiO-66-alkyne-Ni also outperformed previous MOFs in both small-scale and gram-level reactions, which shows UiO-66-alkyne-Ni is a potential contributor to the subsequent industrialization.
Preparation of O-Protected Cyanohydrins by Aerobic Oxidation of α-Substituted Malononitriles in the Presence of Diarylphosphine Oxides
Zhang, Dapeng,Lian, Mingming,Liu, Jia,Tang, Shukun,Liu, Guangzhi,Ma, Cunfei,Meng, Qingwei,Peng, Haisheng,Zhu, Daling
supporting information, p. 2597 - 2601 (2019/04/17)
A mild, reagent-cyanide-free, and efficient synthesis of O-phosphinoyl-protected cyanohydrins from readily available α-substituted malononitriles was realized using diarylphosphine oxides in the presence of O2. Mechanistic studies indicated that in addition to the initial aerobic oxidation of the malononitrile derivative notable features of this process include the formation of a tetrahedral intermediate and a subsequent intramolecular rearrangement. The phosphinoyl-protecting group can be removed by alcoholysis or by reduction with DIBAL-H.
