| 1. |
- Bartholomeyzik, Teresa, et al.
(författare)
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Palladium-Catalyzed Oxidative Arylating Carbocyclization of Allenynes : Control of Selectivity and Role of H2O
- 2014
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Ingår i: Angewandte Chemie International Edition. - Weinheim : Wiley-VCH Verlag GmbH & Co. KGaA. - 1433-7851 .- 1521-3773. ; 53:33, s. 8696-8699
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Tidskriftsartikel (refereegranskat)abstract
- Highly selective protocols for the carbocyclization/arylation of allenynes using arylboronic acids are reported. Arylated vinylallenes are obtained with the use of BF3 center dot Et2O as an additive, whereas addition of water leads to arylated trienes. These conditions provide the respective products with excellent selectivities (generally > 97:3) for a range of boronic acids and different allenynes. It has been revealed that water plays a crucial role for the product distribution.
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| 2. |
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| 3. |
- Chen, Hong, et al.
(författare)
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3D Open-Framework Vanadoborate as a Highly Effective Heterogeneous Pre-catalyst for the Oxidation of Alkylbenzenes
- 2013
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Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 25:24, s. 5031-5036
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Tidskriftsartikel (refereegranskat)abstract
- Three three-dimensional (3D) open-framework vanadoborates, denoted as SUT-6-Zn, SUT-6-Mn, and SUT-6-Ni, were synthesized using diethylenetriamine as a template. SUT-6-Zn, SUT-6-Mn, and SUT-6-Ni are isostructural and built from (VO)(12)O-6 B18O36(OH)(6) clusters bridged by ZnO5, MnO6, and NiO6 polyhedra, respectively, to form the 3D frameworks. SUT-6 is the first vanadoborate with a 3D framework. The framework follows a semiregular hxg net topology with a 2-fold interpenetrated diamond-like channel system. The amount of template used in the synthesis played an important role in the dimensionality of the resulting vanadoborate structures. A small amount of diethylenetriamine led to the formation of this first 3D vanadoborate framework, while an increased amount of diethylenetriamine resulted in vanadoborates with zero-dimensional (0D) and one-dimensional (1D) structures. SUT-6-Zn was proved to be an efficient heterogeneous precatalyst for the oxidation of alkylbenzenes.
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| 4. |
- Deng, Youqian, et al.
(författare)
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Control of Selectivity in Palladium-Catalyzed Oxidative Carbocyclization/Borylation of Allenynes
- 2013
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Ingår i: Angewandte Chemie International Edition. - : Wiley. - 1433-7851 .- 1521-3773. ; 52:24, s. 6283-6287
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Tidskriftsartikel (refereegranskat)abstract
- In control: A highly selective carbocyclization/borylation of allenynes with bis(pinacolato)diboron (B2pin2) under palladium catalysis and with p-benzoquinone (BQ) as the oxidant was developed. The use of either LiOAc⋅2 H2O with 1,2-dichloroethane (DCE) as the solvent or BF3⋅Et2O together with THF is crucial for the selective formation of borylated trienes and vinylallenes, respectively.
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| 5. |
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| 6. |
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| 7. |
- Deng, Youqian, et al.
(författare)
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Palladium-Catalyzed Oxidative Carbocyclizations
- 2012
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Ingår i: Chemistry - A European Journal. - : Wiley. - 0947-6539 .- 1521-3765. ; 18:37, s. 11498-11523
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Forskningsöversikt (refereegranskat)abstract
- Palladium-catalyzed oxidative carboncarbon bond-forming annulations, that is, carbocyclization reactions, have recently emerged as efficient and atom-economical routes to carbo- and heterocycles, whereby less functionalized substrates and fewer synthetic steps are needed to obtain a target molecule compared with traditional non-oxidative carboncarbon bond-forming reactions. In this review, the synthetic efforts in palladium-catalyzed oxidative carbocyclization reactions are summarized.
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| 8. |
- Liu, Leifeng, et al.
(författare)
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Disorder in Extra-Large Pore Zeolite ITQ-33 Revealed by Single Crystal XRD
- 2013
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Ingår i: Crystal Growth & Design. - : American Chemical Society (ACS). - 1528-7483 .- 1528-7505. ; 13:10, s. 4168-4171
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Tidskriftsartikel (refereegranskat)abstract
- The single crystal of the extra-large pore zeolite, ITQ-33, was obtained and used to explore its crystal structure details. The ITQ-33 structure was found to be disordered with the columnar periodic building unit, explaining the morphology changes upon the different Si/Ge ratio, and the formation of the hierarchical structure from assembling of ITQ-33 nanofibers.
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