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Topic: Diene

Related Topics

Alkene

Unsaturated hydrocarbon

Aromatic ring

Hydrocarbon

Catenation

Saturated hydrocarbon

Cyclopentadiene

Alkyne

Aliphatic

Alkane

Benzene

Organic chemistry

Butadiene

Cycloalkane

Autoignition temperature

	Diene polymers
		Usually when we talk of diene polymers, we're talking about polymers made from small molecules, or monomers, that have two carbon-carbon double bonds in what we call the 1 and 3 positions, that is, in the positions shown in the picture below.
		Diene polymers are similar to vinyl polymers, but vinyl polymers are made from monomers with only one carbon-carbon double bond.
		Because these diene polymers have double bonds in the backbone chains, they can be crosslinked by a process called vulcanization.
	www.pslc.ws /macrog/diene.htm (255 words)

	Diene - Wikipedia, the free encyclopedia
		Dienes are hydrocarbons which contain two double bonds.
		Cumulated dienes have the double bonds sharing a common atom as in a group of compounds called allenes.
		The 1,3 configuration of double bonds found in 1,3-butadiene (conjugated double bonds) make these types of dienes capable of participating in more reaction types than is the case for molecules with either just a single alkene functional group or with multiple, but non-alternating, alkene groups.
	en.wikipedia.org /wiki/Diene (159 words)

	The British Theatre Guide: Interview with Diene Petterle and Christopher Heimann
		Diene's background and training are in film while Christopher is happy to confess that he doesn't really like going to the theatre.
		Diene is an attractive Brazilian in her twenties with dyed blonde hair who possesses one of those dazzling Brazilian smiles that rarely leaves her face.
		Diene is particularly excited about appearing in her hometown as one of the major attractions at the largest theatre festival in Brazil.
	www.britishtheatreguide.info /otherresources/interviews/DienePetterle.htm (1390 words)

	diene (Site not responding. Last check: 2007-10-08)
		Conjugated dienes have the double bonds separated by one single bond.
		Cumulated dienes have the double bonds sharing a common atom.
		A compound in which two double bonds exist but are immediate adjacent to each other is, in contrast, called an allene.
	www.yourencyclopedia.net /Diene.html (189 words)

	Conjugated diene rubber composition for tire use and tire - US Patent 6486258 (Site not responding. Last check: 2007-10-08)
		The conjugated diene rubber composition for tires according to claim 1 wherein the content of units having a cis-bond in the total units derived from the 1,3-butadiene monomer and the conjugated diene monomer is at least 90%.
		The conjugated diene rubber composition for tires according to claim 1, wherein the content of the high-cis conjugated diene polymer (I) is in the range of 10% to 100% by weight based on the total weight of the polymer rubbers.
		The homopolymerization of a conjugated diene monomer, and the copolymerization of a conjugated diene monomer with a copolymerizable monomer are usually carried out in an inert hydrocarbon medium by solution polymerization, slurry polymerization, or bulk polymerization in which a monomer is used as a diluent.
	www.patentstorm.us /patents/6486258.html (6573 words)

	[No title]
		Cyclopentadiene is the diene (end Cs of the diene component are blue) and ethyne is the dienophile (Cs of the dienophile component are green).
		The end Cs of the diene component are blue, the Cs of the dienophile double bond are green, and the O is red.
		The end Cs of the diene component are blue, the Cs of the dienophile double bond are green, the N is gold, and the Os are red.
	www.du.edu /~jhornbac/organic/prob20-14.html (313 words)

	Process for production of hydrogenated conjugated diene polymers - Patent 4384081 (Site not responding. Last check: 2007-10-08)
		A process for producing a hydrogenated conjugated diene polymer, which comprises hydrogenating the carbon-carbon double bonds of a conjugated diene polymer in a solvent using a supported catalyst composed of a hydrogenating catalyst supported on a carbon carrier having an average particle diameter of 5 m.mu.
		The conjugated diene polymer used in this invention is prepared by polymerizing 10 to 100% by weight of a conjugated diene monomer and 90 to 0% by weight of an ethylenically unsaturated monomer by solution polymerization, emulsion polymerization, etc. Examples of the conjugated diene monomer are 1,3-butadiene, 2,3-dimethylbutadiene, isoprene, and 1,3-pentadiene.
		Typical examples of the conjugated diene polymer are polybutadiene, polyisoprene, a butadiene/styrene random or block copolymer, and an acrylonitrile/butadiene random or block copolymer.
	www.freepatentsonline.com /4384081.html (3098 words)

	DIEN (Site not responding. Last check: 2007-10-08)
		Die Diene bilden eine Stoffgruppe von Kohlenwasserstoffen, deren Moleküle mindestens zwei Doppelbindungen zwischen den Kohlenstoffatomen aufweisen.
		Die Diene sind von den Alkenen zu unterscheiden, diese weisen nur eine Kohlenstoffdoppelbindung auf.
		Manchmal werden Diene nur als Kohlenwasserstoffe mit zwei Doppelbindungen bezeichnet, ebenso ergeben sich Triene (drei Doppelbindungen), allgemein werden die Diene nur als Alkene mit mehreren Doppelbindungen bezeichnet.
	www.toonorama.com /encyclopedia/D/Dien (179 words)

	Conjugated diene series rubber compositions - Patent 4835216 (Site not responding. Last check: 2007-10-08)
		A conjugated diene series rubber composition comprises, as a rubber component, (a) 20.about.100% by weight of a particular conjugated diene polymer and (b) a diene polymer rubber except for the polymer (a) and is excellent in the processability at unvulcanized state and the rebound resilience, strengths at rupture and wear resistance at vulcanized state.
		Particularly, copolymers of aromatic vinyl compound-conjugated diene compound having a content of aromatic vinyl compound of not less than 3% by weight, preferably not less than 5% by weight are favorable because they are excellent in the processability at unvulcanized state and the rebound resilience, strengths at rupture and wear resistance at vulcanized state.
		In the conjugated diene series rubber composition according to the invention, it is preferable to blend the conjugated diene polymer (a) with natural rubber.
	www.freepatentsonline.com /4835216.html (3992 words)

	Journal of the Chemical Society C: Organic articles
		Diels—Alder reactions of hexafluorobicyclo[2,2,0]hexa-2,5-diene : pyrrole as a diene
		Reaction times vary from a few hours with the most reactive dienes, 1,3-diphenylisobenzofuran and cyclopentadiene, to several months with the least reactive ones, butadiene and cyclohexadiene.
		It is argued, on the basis of spectroscopic data, that reaction occurs by exo-addition to the bicyclo[2,2,0]hexa-2,5-diene, and by exo-addition to the cyclic dienes.
	www.rsc.org /Publishing/Journals/J3/article.asp?doi=J39710000090 (149 words)

	Nobel Prize in Chemistry 1950 - Presentation Speech (Site not responding. Last check: 2007-10-08)
		In diene synthesis the two chains attach themselves to four or two carbon atoms to form a ring, which thus contains six atoms; this number is particularly favourable to cyclization.
		Diene synthesis is a special case, where, owing to certain geometrical and arithmetical relations, growth of the atom chain by attachment of new molecules ceases.
		In the past years the synthesis of dienes has, to be sure, achieved more than you could either foresee or predict when you wrote your paper.
	nobelprize.org /chemistry/laureates/1950/press.html (1327 words)

	Encyclopedia: Diene (Site not responding. Last check: 2007-10-08)
		A chemically conjugated system, is a system of atoms covalently bonded with alternating single and double bonds (e.
		In ecology functional groups are collections of organisms based on morphological, physiological, behavioral, biochemical, or environmental responses or on trophic criteria.
		The Diels-Alder reaction is an organic chemical reaction (specifically, a cycloaddition) between a conjugated diene and a substituted alkene, commonly termed the dienophile to form a substituted cyclohexene system.
	www.nationmaster.com /encyclopedia/Diene (598 words)

	Diene -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-08)
		Dienes are (An organic compound containing only carbon and hydrogen) hydrocarbons which contain two (A covalent bond in which two pairs of electrons are shared between two atoms) double bonds.
		One possible reaction for such dienes is the (Click link for more info and facts about Diels-Alder reaction) Diels-Alder reaction.
		A compound in which two double bonds exist but are immediate adjacent to each other is, in contrast, called an (Click link for more info and facts about allene) allene.
	www.absoluteastronomy.com /encyclopedia/d/di/diene.htm (155 words)

	Corpus Christi Caller Times Caller.com - Former Isles player Diene going ’trotting (Site not responding. Last check: 2007-10-08)
		Diene, the former Texas A&M-Corpus Christi men's basketball player, also will get a lesson in acting, comedy and trickery after signing a contract this week with the Harlem Globetrotters.
		Diene was out of town Thursday visiting family and could not be reached for comment.
		Diene, a native of Senegal, began his collegiate career at the University of Texas-El Paso, where he was a walk-on for the Miners basketball program.
	www.caller.com /2001/july/13/today/localspo/5155.html (430 words)

	Japan discrimination deemed a problem - Boston.com - Asia - News (Site not responding. Last check: 2007-10-08)
		Doudou Diene said he was encouraged by the support the government gave him during his nine-day stay, but said he found officials often failed to understand or recognize the seriousness of racism and discrimination here, especially against the ancestors of Japan's ethnic Koreans.
		Diene, who has made similar visits to about a dozen nations, said he will submit his final report to the U.N. General Assembly in March next year.
		Diene said his final report will likely recommend that Japan enact a national law condemning discrimination, legislation which it now lacks, and increased consultation between officials and minority groups to identify and ease discrimination problems.
	www.boston.com /news/world/asia/articles/2005/07/11/japan_discrimination_deemed_a_problem (413 words)

	Unsaturated propylene/.alpha., .omega.-diene copolymers - Patent 5504171
		Thus, useful classes of dienes for introduction of unsaturation into ethylene-propylene terpolymers are straight-chain and branched-chain acyclic dienes, single ring alicyclic dienes, and multi-ring alicyclic and bridged ring dienes, wherein one of the double bonds will copolymerize while the second is inert to the catalyst.
		Second, the other end of the diene comonomer may react with additional monomer to provide long side chain branches greater in length than the.alpha.,.omega.-diene, in a fashion analogous to the branching in low density polyethylene (LDPE) which is also sometimes referred to as branched polyethylene or high pressure polyethylene.
		wherein Y.sub.unsat is the unsaturated diene mole percentage of the sample, A is the integral of the spectrum from 5 to 6 ppm (olefinic region) and B is the integral of the spectrum from 0 to 2 ppm (aliphatic region).
	www.freepatentsonline.com /5504171.html (4691 words)

	Diene (Site not responding. Last check: 2007-10-08)
		The simplest conjugated diene is 1 3- butadiene :
		The 1 3 configuration of double found in 1 3-butadiene (conjugated double bonds) these types of dienes capable of participating more reaction types than is the case molecules with either just a single alkene functional group or with multiple but non-alternating alkene One possible reaction for such dienes is Diels-Alder reaction.
		A compound in which two double bonds but are immediate adjacent to each other in contrast called an allene.
	www.freeglossary.com /Diene (265 words)

	Diels-Alder Mechanism
		In solution, the carbon-carbon single bond in the diene that connects the two alkenes is constantly rotating, so at equilibrium there is usually some mixture of dienes in the s-trans conformation and some in the s-cis conformation.
		Because of the Diels-Alder's requirement for having the diene in a s-cis conformation, dienes in rings react particularly rapidly because they are "locked" in the s-cis conformation.
		Unlike dienes in open chains in which there is usually some proportion of the diene in the unreactive s-trans conformation, dienes in rings are held in the reactive conformation at all times by the constraints of the ring, making them react faster.
	www.chemhelper.com /dielsalder.html (520 words)

	Process for hydrogenating conjugated diene polymers - Patent 4452951 (Site not responding. Last check: 2007-10-08)
		In a process for hydrogenating a conjugated diene polymer which comprises hydrogenating the carbon-carbon double bonds of the conjugated diene polymer using a hydrogenation catalyst supported on a carrier, the improvement wherein the carrier is porous silica having an average pore diameter of from 80 to 1,200.ANG.
		The conjugated diene polymer used in this invention is a polymer or copolymer derived from 10 to 100% by weight of a conjugated diene monomer and 90 to 0% by weight of an ethylenically unsaturated monomer.
		Typical examples of the conjugated diene polymer are polybutadiene, polyisoprene, butadiene/styrene (random or block) copolymer, acrylonitrile/butadiene (random or alternating) copolymer, The acrylonitrile/butadiene copolymer is especially suitable for use in this invention.
	www.freepatentsonline.com /4452951.html (2989 words)

	Alder, Kurt (Site not responding. Last check: 2007-10-08)
		June 20, 1958, Cologne, W. Ger.), German chemist who was the corecipient, with Otto Diels, of the Nobel Prize for Chemistry in 1950 for their development of the Diels-Alder reaction, or diene synthesis, a widely used method of synthesizing cyclic organic compounds.
		The diene synthesis consists essentially of the linking of a diene, which is a substance containing two alternate double bonds, to a dienophile, which is a compound containing a pair of doubly or triply bonded carbon atoms.
		In 1943 he discovered the ene reaction, which is similar to the diene synthesis, and which also found widespread use in chemical synthesis.
	www.britannica.com /nobel/micro/13_48.html (300 words)

	Japan Times: U.N. expert on racism to visit Japan (Site not responding. Last check: 2007-10-08)
		Diene said Wednesday he has asked the government to allow him to study the perception and interaction of foreigners and minorities in Japanese society, and to see how the country's strong national identity is coping with the challenges of multiculturalism in a globalized world.
		Diene said he has specifically requested a meeting with Tokyo Gov. Shintaro Ishihara or a senior representative from his office.
		Diene will focus on minorities of Korean and Chinese descent, while also looking into the situation that migrants from the rest of Asia, the Arab world and Africa find themselves in as they settle in Japan.
	www.japantimes.co.jp /cgi-bin/makeprfy.pl5?nn20050701a2.htm (287 words)

	United States Patent Application: 0040092644
		The present invention relates to a cross-linkable or cross-linked rubber composition which is usable to constitute a tread of a tire, to such a tread having in particular improved wear resistance, and to a tire having improved endurance by incorporating this tread.
		A composition according to the invention is based on one or more diene elastomers, said composition comprising at least one hydrocarbon plasticizing resin in a quantity of from 5 phr to 35 phr which is miscible in said diene elastomer(s), having a glass transition temperature Tg of between 10.degree.
		The rubber composition according to claim 6, wherein said majority diene elastomer is a solution-prepared styrene-butadiene copolymer and said minority diene elastomer is a polybutadiene having a cis-1,4 linkage content greater than 90%.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040092644".PGNR.&OS=DN/20040092644&RS=DN/20040092644 (6676 words)

	Regulation of Natural Resistance of Avocado Fruit for the Control of Postharvest Disease
		The antifungal diene in ripening fruit is metabolized by the enzyme lipoxygenase.
		The antifungal diene was extracted from avocado peel and quantified as described by Prusky et al.
		The antifungal activity of this compound in similar extracts shown by the striated bars, decreases from 55% to 6% inhibition of hyphal elongation during the same period, indicating a close correlation between the concentration of the antifungal compound and the inhibition of activity of the crude extract.
	www.avocadosource.com /wac2/wac2_p479.htm (1543 words)

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