A Green Recyclable Poly(4-Vinylpyridine)-Supported Copper Iodide Nanoparticle Catalyst for the Chemoselective Synthesis of Pentaerythritol Diacetals from Aromatic Aldehydes
Poly(4-vinylpyridine)-supported copper(I) iodide nanoparticles have been used as an efficient, green recyclable catalyst for the chemoselective synthesis of pentaerythritol diacetals from aromatic aldehydes and pentaerythritol under solvent-free conditions. This catalyst was reused six times without any loss of its activity.
Acetalization of Carbonyl Compounds as Pentaerythritol Diacetals and Diketals in the Presence of Cellulose Sulfuric Acid as an Efficient, Biodegradable and Reusable Catalyst
作者:Hamid Reza Shaterian、Fatemeh Rigi
DOI:10.1002/cjoc.201280002
日期:2012.3
This paper reports a practical and green method for the acetalization of carbonylcompounds as pentaerythritoldiacetals and diketals derivatives using cellulosesulfuricacid as a biodegradable and reusable solid acidcatalyst under thermal solvent‐free conditions.
Crystal X-ray diffraction guided NMR analysis of 3,9-diaryl-2,4,8,10-tetraoxaspiro[5.5]undecanes under differently shielding effect of terminal aromatic rings
作者:Xiaoqiang Sun、Shu-Ling Yu、Zheng-Yi Li、Yang Yang
DOI:10.1016/j.molstruc.2010.03.062
日期:2010.6
5]undecanes were elucidated via high-resolution 1D and 2D NMR techniques including 1 H NMR, 13CNMR, DEPT, 1 H- 1 H COSY, HSQC, and HMBC. Complete and accurate assignment of 1 H and 13C spectral data, especially the discrimination of hydrogens and carbons in four methylenes under differently shielding effect of aromatic rings were achieved by NMR analysis guided by crystal X-ray diffraction.
摘要 3,9-二(邻-、间-和对-氯苯基)-2,4,8,10-四氧杂螺[5.5]十一烷的立体结构通过高分辨率一维和二维核磁共振技术(包括 1 H NMR)阐明、 13 C NMR、DEPT、 1 H-1 H COSY、HSQC 和 HMBC。通过晶体X射线衍射引导的NMR分析,实现了1 H和13 C光谱数据的完整准确归属,尤其是在芳环不同屏蔽作用下对四种亚甲基中氢和碳的区分。
SO3H-functionalized ionic liquids as efficient and recyclable catalysts for the synthesis of pentaerythritol diacetals and diketals
作者:Yuanyuan Wang、Xinxin Gong、Zhizhong Wang、Liyi Dai
DOI:10.1016/j.molcata.2010.01.011
日期:2010.5.1
The efficient, simple and environmentally friendly synthesis of pentaerythritol diacetals and diketals using SO3H-functionalized ionic liquids (ILs) as catalysts was reported. The ILs showed high catalytic activities and reusabilities with good to excellent yields of the desired products. H-0 (Hammett function) values and the minimum-energy geometries of SO3H-functionalized ILs were determined and the results revealed that the acidities and catalytic activities of ILs in acetalization were related to their structures. The IL [PSPy][OTf] with the shortest H-O bond distance had the strongest acidity and the highest catalytic activity in the synthesis of pentaerythritol diacetals and diketals. (C) 2010 Elsevier BM. All rights reserved.