酒精直接转化为乙和H(2) 催化由一个基于阿克里丁的鲁丁具复合体
Chidambaram Gunanathan1, Linda J W Shimon, David Milstein
1Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel.
Journal of the American Chemical Society
|February 17, 2009
概括
这项研究展示了一种复合物,可以有效地将初级酒精转化为乙和. 催化剂在中性和基本条件下促进这些转换,分别释放气.
科学领域:
- 有机金属化学 有机金属化学
- 催化剂是一种催化剂.
- 有机合成 有机合成
背景情况:
- 复合物是有机转换中的多功能催化剂.
- 基于阿克里丁的配体为催化提供独特的固体和电子特性.
- 在有机化学中,从酒精中有效合成乙和 Ester 是至关重要的.
研究的目的:
- 为了研究一种新型的复合物的催化活性,该复合物含有非平面的阿克里丁部分.
- 探索该综合体在不同条件下催化酒精转化的能力.
- 为了阐明乙形成的机制.
主要方法:
- 复合体RuHCl ((A- ((i) Pr-PNP) ((CO)) 的晶体学表征.
- 在中性和基本介质中涉及初级酒精的催化反应.
- 反应产品和副产品的分析,包括H(2) 释放.
主要成果:
- 复合物有效地催化中性介质中的初级酒精形成乙,释放H(2).
- 在基的存在下,该复合物促进了酒精的脱性合以产生.
- 乙的形成可能是通过半乙脱水和随后的添加酒精进行的.
结论:
- 描述的复合体是酒精功能化的有效催化剂.
- 催化剂的活性可以根据反应条件 (中性或基本) 调节.
- 这些发现提供了对催化乙形成机制的见解.
相关概念视频
Aldehydes and Ketones with Alcohols: Hemiacetal Formation
Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Conversion of Alcohols to Alkyl Halides
This lesson delves into the conversion of alcohols to corresponding alkyl halides and the mechanism of action for different reagents. Typically, the hydroxyl group is first protonated to convert it to a stable leaving group. Consequently, based on the starting alcohol, the mechanism undergoes either of the nucleophilic substitution routes, SN1 or SN2. Tertiary alkyl halides are made using the two-step SN1 mechanism that occurs via a carbocation intermediate, which is stabilized by...
Acid Halides to Esters: Alcoholysis
Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
Preparation of Alcohols via Addition Reactions
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
Preparation of Aldehydes and Ketones from Alcohols, Alkenes, and Alkynes
Aldehydes and ketones are prepared from alcohols, alkenes, and alkynes via different reaction pathways. Alcohols are the most commonly used substrates for synthesizing aldehydes and ketones. The conversion of alcohol to aldehyde, which involves the oxidation process, depends on the class of the alcohol used and the strength of the oxidizing agent. For instance, primary alcohol will form an aldehyde when treated with a weak oxidizing agent; however, it gets over-oxidized to a carboxylic acid in...


