- published: 03 Nov 2013
- views: 7664
In organic chemistry, an alkene is an unsaturated hydrocarbon that contains at least one carbon–carbon double bond. Alkene, olefin, and olefine are used often interchangeably (see nomenclature section below). Acyclic alkenes, with only one double bond and no other functional groups, known as mono-enes, form a homologous series of hydrocarbons with the general formula CnH2n. Alkenes have two hydrogen atoms less than the corresponding alkane (with the same number of carbon atoms). The simplest alkene, ethylene (C2H4), which has the International Union of Pure and Applied Chemistry (IUPAC) name ethene is the organic compound produced on the largest scale industrially.Aromatic compounds are often drawn as cyclic alkenes, but their structure and properties are different and they are not considered to be alkenes.
Like a single covalent bond, double bonds can be described in terms of overlapping atomic orbitals, except that, unlike a single bond (which consists of a single sigma bond), a carbon–carbon double bond consists of one sigma bond and one pi bond. This double bond is stronger than a single covalent bond (611 kJ/mol for C=C vs. 347 kJ/mol for C–C) and also shorter with an average bond length of 1.33 Angstroms (133 pm).
Olefin metathesis is an organic reaction that entails the redistribution of fragments of alkenes (olefins) by the scission and regeneration of carbon-carbon double bonds. Catalysts for this reaction have evolved rapidly for the past few decades. Because of the relative simplicity of olefin metathesis, it often creates fewer undesired by-products and hazardous wastes than alternative organic reactions. For their elucidation of the reaction mechanism and their discovery of a variety of highly efficient and selective catalysts, Yves Chauvin, Robert H. Grubbs, and Richard R. Schrock were collectively awarded the 2005 Nobel Prize in Chemistry.
The reaction is catalyzed by metal complexes. Traditional catalysts are prepared by a reaction of the metal halides with alkylation agents, for example WCl6–EtOH–EtAlCl2. The traditional, industrial catalysts are ill-defined and used mainly for Petroleum products. Modern catalysts are well-defined organometallic compounds that come in two main categories, commonly known as Schrock catalysts and Grubbs' catalysts. Schrock catalysts are molybdenum(IV)- and tungsten(IV)-based, and are examples of Schrock alkylidenes.
Video shows what olefin means. Any of a class of unsaturated open-chain hydrocarbons such as ethylene; an alkene with only one carbon-carbon double bond.. olefin pronunciation. How to pronounce, definition by Wiktionary dictionary. olefin meaning. Powered by MaryTTS
This video describes the carpet fibers, Polyester and Olefin. It explains the carpet properties and the pros & cons of each type. We discuss what areas and rooms of the home that would be appropriate for each type of carpet fiber.
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http://www.chriscoltran.com Have you ever wanted to know the difference between olefin fiber and nylon fiber? In this one minute training video, I explain how some manufacturers are using olefin in place of nylon for certain styles and constructions of carpeting. Nylon has always been the most durable fiber in terms of wear and performance. Nylon staining has always been a problem and continues to be an issue for retailers and consumers. Olefin however, is almost stain-proof. Most manufacturers, Shaw, Mohawk, Beaulieu, Stanton, Kane, Dixie to just name a few manufacture with both fibers, including a third fiber, polyester. Olefin naturally stain-resistant or stain-proof. It is a solution-dyed fiber and the color is locked into the fiber when it is extruded and before it is made int...
Customers shares their experiences using the UOP Oleflex™ Process. Learn more at http://www.honeywellnow.com/ Subscribe on YouTube: http://hwll.co/YouTubeSubscribe Follow us on Twitter: https://twitter.com/honeywellnow Like Honeywell on Facebook: https://www.facebook.com/HoneywellNow Find out about careers at Honeywell: http://hwll.co/LinkedInCareers Honeywell offers a broad range of technology and equipment for the oil and gas industries – helping customers around the world operate safe, reliable, efficient, sustainable and more profitable facilities. Honeywell’s UOP is a leading technology and equipment supplier for the refining, petrochemicals and gas processing industries. Honeywell Process Solutions pioneered process automation control with leading technologies from the pl...
Olefin fiber is a synthetic fiber made from a polyolefin, such as polypropylene or polyethylene.It is used in wallpaper, carpeting, ropes, and vehicle interiors.Olefin's advantages are its strength, colourfastness and comfort, its resistance to staining, mildew, abrasion, sunlight and its good bulk and cover. This channel is dedicated to make Wikipedia, one of the biggest knowledge databases in the world available to people with limited vision. Article available under a Creative Commons license Image source in video
It dawned on me
That basically
They have put a price on everything.
In a world of greed
And exploiting needs
Some are cashing in, while others bleed.
If I sung out of tune would it sell now?
If I sung out of tune would it sell?
The relevance of the question's unclear now
The big picture's as scary as hell.
It's do or die to survive
In this day and age to stay alive.
When the top boys fight
One's left one's right
The streets become a stage
Actor am I?
If I sung out of tune would it sell now?
If I sung out of tune would it sell?
Focus on the small things and then you fail
To see that we're not doing so well.
Am I alone here
Or am I the only one who sees in different tones?
Somehow we've all adhered
To believe in everything that we are shown.
One mans views today makes
Front page news tomorrow
Injecting doubt to talk about.
It'd be no surprise
If this world was designed