在温和的反应条件下,简单的卤代酚与α,β-不饱和烯烃成功实现了脱芳构化/螺环化过程。这种转化解决了 SE Ar工艺引起的苯酚支架(6π-电子)脱芳构化转化中的化学选择性问题,从而能够以高产率构建含有连续四元全碳中心的通用环己二烯酮框架。进一步的研究为该过程提供了有价值的见解,揭示了脱溴/螺环化是通过 S RN 1 途径发生的。
Two amino functionalized Metal–Organic Frameworks (MOFs), [Zn(Py2TTz)(2-NH2-BDC)]·(DMF)}n (1) and [Cd(Py2TTz)(2-NH2-BDC)]·(DMF)·0.5(H2O)}n (2) (where Py2TTz = 2,5-bis(4-pyridyl)thiazolo[5,4-d]thiazole, 2-NH2-BDC = 2-amino-1,4-benzenedicarboxylate, and DMF = N,N-dimethylformamide), were synthesized and characterized using the primary ligand 2-amino-1,4-benzenedicarboxylic acid (2-NH2-H2BDC) and the
Tris(hydroxymethyl)aminomethane as an efficient organobase catalyst for the synthesis of β-phosphonomalonates
作者:Reddi Mohan Naidu Kalla、Il Kim
DOI:10.1016/j.tetlet.2016.12.035
日期:2017.2
Tris(hydroxymethyl)aminomethane (THAM) is a highly efficient and recyclable organobasecatalyst for the nucleophilic phosphonylation of benzylidene malononitrile under solvent-free conditions. This new catalytic methodology is applicable without a solvent, eco-friendly, economically viable, avoids conventional isolation procedures, and has a facile work-up procedure and wide scope. THAM is an inexpensive
Introduction of Functionalized Mesopores to Metal–Organic Frameworks via Metal–Ligand–Fragment Coassembly
作者:Jinhee Park、Zhiyong U. Wang、Lin-Bing Sun、Ying-Pin Chen、Hong-Cai Zhou
DOI:10.1021/ja3085884
日期:2012.12.12
Introduction of functionalized mesopores into microporous metal-organic frameworks (MOFs) can endow them with suitable properties for applications in gas storage, separation, catalysis, and drug delivery. However, common methods for functionalization (including pre- and post-synthetic modifications) of the internal surface of a MOF reduce the pore size of the MOF because the additional functional groups fill up the pores. We present a metal-ligand-fragment coassembly strategy for the introduction of (meso)pores functionalized with various substituent groups on the ligand fragments. Astonishingly, this new functionalization strategy increases the pore volume of a MOF instead of reducing it. Since the ligand fragments are often readily available or easily prepared, the new procedure for synthesis of the modified MOFs becomes much easier and more applicable than existing approaches. Remarkably, mesopores can be generated conveniently and controllably by the coassembly of a ligand and its fragment containing the desired functional groups. The fragment/ligand ratio has been optimized to preserve the parent structure and to promote maximum mesopore introduction, which has led to a systematic evaluation of the effectiveness of a series of functional groups for the adsorption of guest molecules.