Strategies for the Generation of Molecularly Imprinted Polymeric Nitroxide Catalysts
摘要:
[GRAPHICS]Two strategies for preparing catalytically active molecularly imprinted nitroxide-containing polymers are outlined. Both strategies rely upon the thermal rearrangement chemistry of tertiary amine N-oxides. To this end, several polymers were prepared and the polymeric nitroxides were revealed by oxidation with m-CPBA. All of the resulting polymeric catalysts proved to be competent mediators of the oxidation of alcohols.
Enantioselective Hydroformylation of 1-Alkenes with Commercial Ph-BPE Ligand
摘要:
A rhodium complex, in conjunction with commercially available Ph-BPE ligand, catalyzes the branch-selective asymmetric hydroformylation of 1-alkenes and rapidly generates alpha-chiral aldehydes. A wide range of terminal olefins Including 1-dodecene were examined, and all delivered high enantioselectivity (up to 98:2 er) as well as good branch:linear ratios (up to 15:1).
<i>C</i>-Methylation of Alcohols, Ketones, and Indoles with Methanol Using Heterogeneous Platinum Catalysts
作者:S. M. A. Hakim Siddiki、Abeda S. Touchy、Md. A. R. Jamil、Takashi Toyao、Ken-ichi Shimizu
DOI:10.1021/acscatal.7b04442
日期:2018.4.6
heterogeneous catalytic method for the methylation of C–H bonds in alcohols, ketones, and indoles with methanol under oxidant-free conditions using a Pt-loaded carbon (Pt/C) catalyst in the presence of NaOH is reported. This catalytic system is effective for various methylation reactions: (1) the β-methylation of primary alcohols, including aryl, aliphatic, and heterocyclic alcohols, (2) the α-methylation
From Olefins to Alcohols: Efficient and Regioselective Ruthenium-Catalyzed Domino Hydroformylation/Reduction Sequence
作者:Ivana Fleischer、Katrin Marie Dyballa、Reiko Jennerjahn、Ralf Jackstell、Robert Franke、Anke Spannenberg、Matthias Beller
DOI:10.1002/anie.201207133
日期:2013.3.4
Exploring the alternatives: Ruthenium imidazoyl phosphine complexes catalyze the dominohydroformylation/reduction of alkenes to alcohols in good yields and with good selectivities (see scheme). Linear aliphatic alcohols are synthesized under reaction conditions typically used in industrial hydroformylations.
Carbon monoxide and hydrogen (syngas) as a C1-building block for selective catalytic methylation
作者:Akash Kaithal、Markus Hölscher、Walter Leitner
DOI:10.1039/d0sc05404f
日期:——
catalytic reaction using syngas (CO/H2) as feedstock for the selective β-methylation of alcohols was developed whereby carbon monoxide acts as a C1 source and hydrogen gas as a reducing agent. The overall transformation occurs through an intricate network of metal-catalyzed and base-mediated reactions. The molecular complex [Mn(CO)2Br[HN(C2H4PiPr2)2]] 1 comprising earth-abundant manganese acts as the
开发了使用合成气 (CO/H 2 ) 作为原料对醇进行选择性 β-甲基化的催化反应,其中一氧化碳作为 C1 源,氢气作为还原剂。整体转化通过金属催化和碱介导反应的复杂网络发生。含有丰富的锰的分子络合物 [Mn(CO) 2 Br[HN(C 2 H 4 P i Pr 2 ) 2 ]] 1作为催化系统中的金属组分,能够在合成气中从合成气中生成甲醛。有用的反应。这种新的合成气转化开辟了在 sp 3处安装甲基分支的途径碳中心利用可再生原料和能源合成生物活性化合物、精细化学品和先进的生物燃料。
Iridium‐Catalyzed Domino Hydroformylation/Hydrogenation of Olefins to Alcohols: Synergy of Two Ligands
chance to develop new catalytic systems before empirical studies were undertaken. Then the iridium-catalyzed domino hydroformylation/reduction of olefins to alcohols under water–gas shift reaction conditions was studied as an example. Two different ligands (L1 and L10) applied at the same time improved alcohol yields and verified the computational model.
Formic Acid: A Promising Bio-Renewable Feedstock for Fine Chemicals
作者:Manuel G. Mura、Lidia De Luca、Giampaolo Giacomelli、Andrea Porcheddu
DOI:10.1002/adsc.201200748
日期:2012.11.26
petroleum-based raw materials, carbon dioxide (CO2) is becoming increasing attractive as organic carbon source. In this perspective, formicacid (HCOOH) might be an interesting bio-renewable solution to store, transport, and activate carbon dioxide for the synthesis of value-added chemicals. Herein, HCOOH has been successfully used as C1 building block for the synthesis of a library of alcohols via a catalysed