中空的Fe 3 O 4 @ DA-SO 3 H:一种高效且可重复使用的异质纳米磁性酸催化剂,用于合成二氢吡啶和二氧杂十二碳hydro啶衍生物
摘要:
摘要在这项工作中,首次涉及高度稳定和高效的超顺磁性催化剂H-Fe 3 O 4 @ DA-SO 3 H,涉及中空形态的Fe 3 O 4采用无水热模板法制备了以多巴胺为核,多巴胺为壳的方法。它已被用作新的可回收催化剂,用于各种一锅多组分有机反应,例如合成1,4-二氢吡啶(1,4-DHP)和1,8-二氧杂脱氧代ac啶衍生物。对该新型磁性催化剂进行了不同的分析,包括X射线粉末衍射(XRD),傅里叶变换红外光谱(FT-IR),场发射扫描电子显微镜(FE-SEM),透射电子显微镜(TEM),能量色散X射线光谱(EDX),振动样品磁力计(VSM)和热重分析(TGA)。此外,制备的空心Fe 3 O 4的ρ 壳计算出的微颗粒仅比固态球状Fe 3 O 4轻。常规地,使用外磁体回收催化剂,并且至少在六个连续的运行中重复使用催化剂,而没有明显损失其活性。 图形概要
Hollow Fe3O4@DA-SO3H: an efficient and reusable heterogeneous nano-magnetic acid catalyst for synthesis of dihydropyridine and dioxodecahydroacridine derivatives
highly stable and efficient super-paramagnetic catalyst, H-Fe3O4@DA-SO3H, involving hollow morphology of Fe3O4 as core and dopamine as shell was prepared through hydrothermal template-free method. It has been used as a new and recoverable catalyst for various one-pot multi-component organic reactions such as synthesis of 1,4-dihydropyridine (1,4-DHP) and 1,8-dioxodecahyroacridine derivatives. The new magnetic
摘要在这项工作中,首次涉及高度稳定和高效的超顺磁性催化剂H-Fe 3 O 4 @ DA-SO 3 H,涉及中空形态的Fe 3 O 4采用无水热模板法制备了以多巴胺为核,多巴胺为壳的方法。它已被用作新的可回收催化剂,用于各种一锅多组分有机反应,例如合成1,4-二氢吡啶(1,4-DHP)和1,8-二氧杂脱氧代ac啶衍生物。对该新型磁性催化剂进行了不同的分析,包括X射线粉末衍射(XRD),傅里叶变换红外光谱(FT-IR),场发射扫描电子显微镜(FE-SEM),透射电子显微镜(TEM),能量色散X射线光谱(EDX),振动样品磁力计(VSM)和热重分析(TGA)。此外,制备的空心Fe 3 O 4的ρ 壳计算出的微颗粒仅比固态球状Fe 3 O 4轻。常规地,使用外磁体回收催化剂,并且至少在六个连续的运行中重复使用催化剂,而没有明显损失其活性。 图形概要
TiO<sub>2</sub>-coated magnetite nanoparticle-supported sulfonic acid as a new, efficient, magnetically separable and reusable heterogeneous solid acid catalyst for multicomponent reactions
作者:Ali Amoozadeh、Sanaz Golian、Salman Rahmani
DOI:10.1039/c5ra06515a
日期:——
TiO2-coated magnetite nanoparticles-supported sulfonic acid (nano-Fe3O4–TiO2–SO3H (n-FTSA)) is synthesized by the immobilization of –SO3H groups on the surface of nano-Fe3O4–TiO2.
Process for preparing positive and negative images using photohardenable electrostatic master
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0315121A2
公开(公告)日:1989-05-10
Process for producing negative or positive images from a photohardenable electrostatic master comprising an electrically conductive substrate bearing a photohardenable layer containing a photoinhibitor and a visible light sensitizer wherein the negative image (1) is prepared by (a) imagewise exposing to visible radiation, (b) charging electrostatically the master, (c) developing the charged image with an electrostatic toner, e.g., liquid electrostatic developer, and (d) transferring the toner image to a surface, e.g., paper. The positive image (2) is prepared by (a) imagewise exposing to ultraviolet radiation, (b) exposing overall to visible radiation followed by steps (b), (c) and (d) above. Multiple images can be prepared from the same master as well as color proofs using different color toners or developers and transferring in register over the original image.
1,4-Dihydropyridine charge control agents for electrostatographic toners and developers
申请人:EASTMAN KODAK COMPANY
公开号:EP1109070A2
公开(公告)日:2001-06-20
A charge control agent is disclosed selected from the group consisting of 1,4-dihydropyridines having the following general structure:
where R1, R2, R3, R4, R5, X, and Z are defined in the specification. These compounds are useful in electrostatographic toners and developers.
本发明公开了一种电荷控制剂,它选自具有以下一般结构的 1,4-二氢吡啶类:
其中 R1、R2、R3、R4、R5、X 和 Z 的定义见说明书。这些化合物适用于电致发光调色剂和显影剂。
Jain, S M; Khajuria, R K; Dhar, K L, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1991, vol. 30, # 11, p. 1037 - 1040
作者:Jain, S M、Khajuria, R K、Dhar, K L、Singh, Surjeet、Bani, S、et al.