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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
71.9K
Organic Compounds03:02

Organic Compounds

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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
58.4K
Entropy and Solvation02:05

Entropy and Solvation

8.7K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
8.7K
Radical Substitution: Halogenation of Alkanes and Alkyl Substituents01:27

Radical Substitution: Halogenation of Alkanes and Alkyl Substituents

10.4K
In the presence of heat or light, alkanes react with molecular halogens to form alkyl halides by a substitution reaction called radical halogenation. This reaction has three steps: initiation, propagation, and termination, as seen in the radical chlorination of methane to produce methyl chloride.
In the initiation step of the reaction, the chlorine molecule undergoes homolytic cleavage in the presence of light or heat, forming two highly reactive chlorine radicals. Propagation occurs in two...
10.4K
Preparation of Alcohols via Substitution Reactions01:38

Preparation of Alcohols via Substitution Reactions

7.6K
Overview
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group.  The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2,  depending on the nature of carbon attached to the halide.
Primary alcohols are synthesized from primary alkyl halides, and the...
7.6K
Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

1.5K
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
1.5K

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Updated: Mar 13, 2026

Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol
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Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol

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传统基溶剂的替代品

Mary L Harrell1, Thomas Malinski1, Coralys Torres-López1

  • 1Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States.

Journal of the American Chemical Society
|October 19, 2016
PubMed
概括
此摘要是机器生成的。

碳化合物寡合物,如多-烯酸,在溶剂混合物中提供安全的,不易挥发的替代品. 这些寡合溶剂表现出很好的性能,匹配赫.

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科学领域:

  • 绿色化学
  • 溶剂科学
  • 聚合物化学

背景情况:

  • 传统的低分子量溶剂,如赫,带来了环境和安全问题.
  • 在化学过程中需要可持续,无毒和可回收的溶剂替代品.

研究的目的:

  • 评估碳化合物寡合物,特别是聚-烯 (PAO),作为对赫的可行的替代品.
  • 评估PAO在热态和双相溶剂系统中的性能.
  • 调查PAO与赫相比的液,可溶性和催化性能.

主要方法:

  • 使用紫外线可见光谱来比较PAO和heptane的溶解性质.
  • 在与极性溶剂 (甲醇,水性乙醇,DMF) 的热态混合物和与乙二相混合物中研究的PAO.
  • 在PAO和肝溶剂中研究了亚染料异构化动力学,有或没有碳酸催化剂.

主要成果:

  • PAO 呈现较低的极相液,类似于赫.
  • 对于特定的染料,PAO的溶解度与赫相美.
  • 在溶剂混合物中,PAO作为有效的防剂.
  • 在PAO和heptane中,染剂的异构化速率是相当的,无论是热的还是碳酸催化剂的.

结论:

  • 像PAO这样的碳化合物寡合物是有效的,无毒的,不易挥发的,可回收的赫替代品.
  • 酸盐保持了低分子量的理想溶剂特性.
  • 这些寡合溶剂为各种化学应用提供了可持续的替代品,减少了对常规溶剂的依赖.