Cobalt-Catalyzed Diastereoselective Cross-Couplings between Alkynylzinc Pivalates and Functionalized Cyclic Iodides or Bromides
摘要:
Various 1,2-, 1,3-, and 1,4-substituted cyclic iodides or bromides undergo highly diastereoselective cross-couplings (diastereoselectivity (dr) up to 99:1) with a range of alkynylzinc pivalates, using CoCl2 (20 mol %) and trans-N,N,N',N'-tetramethylcyclohexane-1,2-diamine as a catalytic system.
BIODEGRADABLE ORGANIC RADICAL-FUNCTIONALIZED POLYCARBONATES FOR MEDICAL APPLICATIONS
申请人:International Business Machines Corporation
公开号:US20160220705A1
公开(公告)日:2016-08-04
Paramagnetic, amphiphilic, biocompatible polymers were prepared comprising a carbonate repeat unit bearing a paramagnetic organic radical, more specifically a nitroxyl radical. The radical polymers can be produced in one step from a precursor polymer bearing an active ester side chain by treating the precursor polymer with a radical-bearing nucleophile. The precursor polymer can be prepared by organocatalyzed catalyzed ring opening polymerization (ROP) of a cyclic carbonate monomer bearing an active ester side chain. The radical polymers can be non-toxic and partially biodegradable. The radical polymers have utility as contrast enhancing agents in a medical imaging application and/or as therapeutic agents for treating a medical condition. The radical polymers can also serve as carriers for therapeutic agents (e.g., drugs) and/or medical image enhancing agents (e.g., NIRF dyes).
CYCLIC CARBONYL COMPOUNDS WITH PENDANT CARBONATE GROUPS, PREPARATIONS THEREOF, AND POLYMERS THEREFROM
申请人:Fujiwara Masaki
公开号:US20110269917A1
公开(公告)日:2011-11-03
A one pot method of preparing cyclic carbonyl compounds comprising an active pendant pentafluorophenyl carbonate group is disclosed. The cyclic carbonyl compounds can be polymerized by ring opening methods to form ROP polymers comprising repeat units comprising a side chain pentafluorophenyl carbonate group. Using a suitable nucleophile, the pendant pentafluorophenyl carbonate group can be selectively transformed into a variety of other functional groups before or after the ring opening polymerization.
Tale of a Twist: Magnetic and Optical Switching in Copper(II) Semiquinone Complexes
作者:Pratik Verma、John Weir、Liviu Mirica、T. Daniel P. Stack
DOI:10.1021/ic200958g
日期:2011.10.17
that is observed in both phenol hydroxylation and catechol oxidation with the side-on peroxide species [Cu2O2(DBED)2]2+ (DBED = N1,N2-di-tert-butylethane-1,2-diamine) is identified as a copper(II) semiquinone species ([1]+) through independent synthesis and characterization. The reaction of the redox-active 3,5-di-tert-butylquinone ligand with [(DBED)CuI(MeCN)]+ yields a copper(II) semiquinone [1]+ complex
中间体(ç了在两个苯酚羟基化和儿茶酚氧化观察到与侧面上的过氧化种类)[铜2 ö 2(DBED)2 ] 2+(DBED = Ñ 1,Ñ 2 -二叔-butylethane-1 ,2-二胺)通过独立的合成和表征被鉴定为铜 (II) 半醌物种 ([ 1 ] + )。具有氧化还原活性的 3,5-二叔丁基醌配体与 [(DBED)Cu I (MeCN)] +反应生成铜 (II) 半醌 [ 1 ] +具有单线基态和强烈紫色发色团的复合物 (ε 580 ∼ 3500 M –1 cm –1 )。迄今为止表征的所有其他铜 (II) 半醌配合物都是顺磁性的且颜色较弱 (ε 800 ∼ 500 M –1 cm –1 )。Cu II中心与 [ 1 ] + 中半醌自由基之间的反铁磁耦合的特征在于顺磁性1H NMR 和 SQUID 磁力计。比较 X 射线晶体结构以及密度泛函理论计算将铜 (II) 半醌配合物的几何结构与其磁性和光学性质相关联。[
ANTIMICROBIAL CATIONIC POLYCARBONATES
申请人:INTERNATIONAL BUSINESS MACHINES CORPORATION
公开号:US20140301967A1
公开(公告)日:2014-10-09
Antimicrobial cationic polymers having one or two cationic polycarbonate chains were prepared by organocatalyzed ring opening polymerization. One antimicrobial cationic polymer has a polymer chain consisting essentially of cationic carbonate repeat units linked to one or two end groups. The end groups can comprise a covalently bound form of biologically active compound such as cholesterol. Other antimicrobial cationic polymers have a random copolycarbonate chain comprising a minor mole fraction of hydrophobic repeat units bearing a covalently bound form of a vitamin E and/or vitamin D2. The cationic polymers exhibit high activity and selectivity against Gram-negative and Gram-positive microbes and fungi.
POLYMERS BEARING PENDANT PENTAFLUOROPHENYL ESTER GROUPS, AND METHODS OF SYNTHESIS AND FUNCTIONALIZATION THEREOF
申请人:Fujiwara Masaki
公开号:US20100305281A1
公开(公告)日:2010-12-02
A one pot method of preparing cyclic carbonyl compounds comprising an active pendant pentafluorophenyl ester group is disclosed. The cyclic carbonyl compounds can be polymerized by ring opening methods to form ROP polymers comprising repeat units comprising a side chain pentafluorophenyl ester group. Using a suitable nucleophile, the pendant pentafluorophenyl ester group can be selectively transformed into a variety of other functional groups before or after the ring opening polymerization.