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相关概念视频

Physical Properties of Ethers02:17

Physical Properties of Ethers

8.3K
Overview
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
8.3K
¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

1.6K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
1.6K
Conformations of Ethane and Propane02:18

Conformations of Ethane and Propane

16.7K
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
16.7K
Solvating Effects02:12

Solvating Effects

8.4K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
8.4K
Physical Properties of Alcohols and Phenols02:32

Physical Properties of Alcohols and Phenols

16.5K
Alcohols are organic compounds in which a hydroxy group is attached to a saturated carbon. Phenols are a class of alcohols containing a hydroxy group attached to an aromatic ring. The physical properties of the alcohols and phenols are influenced by hydrogen bonding due to the oxygen–hydrogen dipole in the hydroxy functional group and dispersion forces between alkyl or aryl regions of alcohol and phenol molecules.
Alcohols possess a higher boiling point than aliphatic hydrocarbons of similar...
16.5K
Protection of Alcohols02:31

Protection of Alcohols

7.9K
This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
7.9K

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相关实验视频

Updated: Jan 7, 2026

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
08:23

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry

Published on: June 14, 2018

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太空飞船中1-醇的最大允许度

Valerie E Ryder, Dianne A Yap

    Aerospace medicine and human performance
    |December 29, 2025
    PubMed
    概括
    此摘要是机器生成的。

    为了保护宇航员免受中枢神经系统的抑郁,并保持男性生育能力,为1-propanol建立了新的航天器最大允许度 (SMAC). 这些新的1-propanol暴露限值是2-propanol暴露限值的一半.

    关键词:
    1-烯醇的使用方法在SMAC中,SMAC是SMAC.吸入性毒性 吸入性毒性这是一种n-propanol.

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    Microdialysis of Ethanol During Operant Ethanol Self-administration and Ethanol Determination by Gas Chromatography
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    Extraction and Analysis of Taiwanese Green Propolis
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    Last Updated: Jan 7, 2026

    Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
    08:23

    Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry

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    Microdialysis of Ethanol During Operant Ethanol Self-administration and Ethanol Determination by Gas Chromatography
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    Extraction and Analysis of Taiwanese Green Propolis
    06:50

    Extraction and Analysis of Taiwanese Green Propolis

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    科学领域:

    • 航空航天医学 航空航天医学
    • 毒理学 毒理学 毒理学
    • 环境健康 环境健康

    背景情况:

    • 1-醇是一种在航天器中发现的挥发性有机化合物.
    • 现有的安全限值存在于2-propanol,但不是1-propanol.
    • 这项研究解决了对1-醇暴露限值的需求.

    研究的目的:

    • 为了推导出急性和长期航天器最大允许度 (SMAC) 的1-propanol.
    • 为了确保宇航员在正常和非标称空间飞行条件下安全.
    • 根据吸入毒性数据,确定暴露限值.

    主要方法:

    • 进行了对1-propanol吸入毒性研究的文献搜索.
    • 使用的关键词包括"1-propanol"",n-propanol"和"吸入毒性".
    • 对急性和慢性暴露效应的动物模型数据进行了审查.

    主要成果:

    • 对3250ppm的急性暴露导致小鼠中枢神经系统的抑郁.
    • 在动物中,在120小时的1600ppm下没有观察到任何不良影响.
    • 在7000ppm下,男性生育能力下降,持续294小时.

    结论:

    • 确定的1小时和24小时SMAC分别为205ppm和100ppm,以防止中枢神经系统的抑郁.
    • 在没有观察到不良影响的基础上,设置7天的SMAC为60ppm.
    • 建议的SMAC为35ppm,持续30,180和1000天,以保持男性生育能力.