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相关概念视频

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

2.2K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
2.2K
Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

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Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
2.9K
Acid Halides to Ketones: Gilman Reagent01:14

Acid Halides to Ketones: Gilman Reagent

3.0K
Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen...
3.0K
Methods of reducing fever01:22

Methods of reducing fever

695
The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:
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Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction01:09

Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction

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Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a methylene group. The method was independently discovered by N. Kishner in 1911 and L. Wolff in 1912. The reduction is carried out in high-boiling solvents such as ethylene glycol and diethylene glycol because heat is required to deprotonate the N–H proton in one of the reaction steps.                                       ...
4.6K
Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

10.5K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
10.5K

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减少下巴变得更加简单

Qutaiba N M Shah Mardan1, Shahd Almonaie2, Abdullah A Al Qurashi3,4

  • 1From the Plastic and Reconstructive Surgery Department, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar.

Plastic and reconstructive surgery. Global open
|September 11, 2023
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的手术技术,用于减少下巴,使用5毫米的切割,避免骨折. 这种方法旨在获得最佳的结果,安全性,以及更简单,更快的下巴增大手术.

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科学领域:

  • 整形外科 整形外科 整形外科
  • 整形外科美容手术 整形外科美容手术
  • 面部美学 面部美学

背景情况:

  • 部形,如巨型形和微型形,可以显著影响面部美学和和.
  • 对于下巴异常的现有手术方法是可用的,但可能涉及复杂的程序.
  • 需要更简单,更安全,更快速的下巴缩小技术.

研究的目的:

  • 介绍一种用于下巴缩小的新手术方法.
  • 为了实现最佳的审美效果,提高安全性和降低并发症风险.
  • 为下巴缩小提供一种简单有效的手术选择.

主要方法:

  • 提出了一种用于下巴缩小的新手术技术.
  • 该程序使用5毫米的切割来减少骨.
  • 这种方法特别避免了骨切除术 (骨切割) 的需要.

主要成果:

  • 拟议的技术提供了一种方法来减少下巴,而不是骨折.
  • 该方法旨在产生最佳结果.
  • 它旨在最大限度地提高安全性,并最大限度地降低并发症的风险.

结论:

  • 描述的手术方法为下巴缩小提供了一个简单快速的选择.
  • 这种技术解决了对少入侵的下巴增大手术的需求.
  • 进一步的评估可能会证实它在改善面部和和患者满意度方面的有效性.