设计,合成和表征一种持久的非衍生物
Irvinder Kaur1, Mikael Jazdzyk, Nathan N Stein
1Department of Chemistry and Materials Science Program, University of New Hampshire, Durham, New Hampshire 03824-3598, USA.
Journal of the American Chemical Society
|January 9, 2010
概括
研究人员已经合成了第一个稳定的非衍生物,克服了氧化降解的挑战. 在大型烯化学领域的这一突破为先进的有机半导体材料打开了大门.
科学领域:
- 有机化学 有机化学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 大型乙烯对于有机电子来说至关重要,但由于氧化降解,很难合成.
- 开发持久和可溶性大乙烯对于推进薄膜有机半导体应用至关重要.
研究的目的:
- 为了克服在制备大型酸盐时容易氧化降解的技术障碍.
- 设计,合成,分离和描述第一个持久的非衍生物.
主要方法:
- 利用了分子设计的实验和理论替代物效应的组合.
- 在非骨架的末端环上使用了基或基替代剂.
- 描述了由此产生的非衍生物,以确认其稳定性和结构.
主要成果:
- 成功地突破了大型酸盐容易氧化降解的技术障碍.
- 合成和表征了第一个持久的非衍生物.
- 证明了基/基替代剂将开单基转化为封闭系统,增强稳定性.
结论:
- 开发的分子设计策略有效地防止了大型乙烯的氧化降解.
- 合成的持久非衍生物是有机半导体应用的重大进步.
- 替代物效应适用于为先进材料制造其他稳定,可溶性,大衍生物.
相关概念视频
00:53Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
02:39Nomenclature of Alkynes
Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
01:28Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
01:28Stability of Conjugated Dienes
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
02:27Preparation of Alkynes: Alkylation Reaction
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
01:16Structure of Conjugated Dienes
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...