{"id":4937,"date":"2021-12-27T13:30:08","date_gmt":"2021-12-27T13:30:08","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=4937"},"modified":"2026-04-28T10:41:54","modified_gmt":"2026-04-28T10:41:54","slug":"commonly-used-reagents-ethyl-vinyl-ether","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/commonly-used-reagents-ethyl-vinyl-ether\/","title":{"rendered":"R\u00e9actifs couramment utilis\u00e9s - \u00e9ther \u00e9thylvinylique"},"content":{"rendered":"<!-- lc-qa-start -->\n<p><strong>R\u00e9ponse rapide :<\/strong> Pour les sujets de peinture et de rev\u00eatement, les formulateurs comparent g\u00e9n\u00e9ralement le pouvoir mouillant, l'adh\u00e9rence, la qualit\u00e9 de surface et la durabilit\u00e9 ensemble car le m\u00eame ajustement peut am\u00e9liorer une propri\u00e9t\u00e9 tout en en affaiblissant une autre.<\/p>\n<!-- lc-qa-end -->\n\n\n<p>\u3010Nom anglais\u3011Ethyl Vinyl Ether<\/p>\n\n\n\n<p>\u3010Formule mol\u00e9culaire\u3011 C4H8O<\/p>\n\n\n\n<p>\u3010Molecular Weight\u301172.11<\/p>\n\n\n\n<p>\u3010CAS Registration Number\u3011 [109-92-2]<\/p>\n\n\n\n<p>\u3010Formule structurelle\u3011CH3CH2OCH=CH2<\/p>\n\n\n\n<p>[Propri\u00e9t\u00e9s physiques] bp 33 oC, d 0,753 g\/cm3. Il est soluble dans la plupart des solvants organiques et peut \u00eatre utilis\u00e9 dans une vari\u00e9t\u00e9 de solvants organiques.<\/p>\n\n\n\n<p>[Ce r\u00e9actif est vendu dans les entreprises de r\u00e9actifs chimiques du pays et de l'\u00e9tranger.<\/p>\n\n\n\n<p>[Pr\u00e9cautions] Ce r\u00e9actif est un produit chimique hautement volatil et inflammable. Il est recommand\u00e9 de le stocker dans un endroit sec et \u00e0 basse temp\u00e9rature et de l'utiliser sous une hotte.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>L'\u00e9ther \u00e9thylvinylique est principalement utilis\u00e9 comme groupe protecteur du groupe hydroxyle, comme r\u00e9actif de transfert de vinyle et participe \u00e0 la r\u00e9action d'addition par cyclisation dans la synth\u00e8se organique.<\/p>\n\n\n\n<p>Parmi les nombreux groupes protecteurs des groupes hydroxy, l'\u03b1-\u00e9thoxy-\u00e9ther \u00e9thylique (EE) form\u00e9 par l'\u00e9thyl-\u00e9ther vinylique et l'hydroxy est l'un des groupes protecteurs les plus couramment utilis\u00e9s et les plus pratiques. La r\u00e9action n\u00e9cessite g\u00e9n\u00e9ralement un catalyseur acide fort, le TFA et le TsOH peuvent \u00eatre utilis\u00e9s \u00e0 cette fin, le plus couramment utilis\u00e9 \u00e9tant le PPTS. La r\u00e9action est g\u00e9n\u00e9ralement compl\u00e9t\u00e9e par une agitation de plusieurs heures \u00e0 temp\u00e9rature ambiante. Dans la plupart des cas, le rendement du produit est sup\u00e9rieur \u00e0 95% (formule 1) [1,2]. Le groupe protecteur EE peut facilement compl\u00e9ter la r\u00e9action de d\u00e9protection dans des conditions acides. PPTS-EtOH et HCl-MeOH aq. sont les m\u00e9thodes recommand\u00e9es (\u00e9quation 2).<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.biochemsafebuy.com\/static\/kindeditor-4.1.10\/attached\/image\/20191127\/20191127095147_88752.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Sous l'action du catalyseur d\u00e9riv\u00e9 de l'ac\u00e9tate mercurique, l'\u00e9ther \u00e9thylvinylique et l'hydroxyle subissent une r\u00e9action de transfert de vinyle pour g\u00e9n\u00e9rer le produit d'\u00e9ther vinylique correspondant (formule 3) [5]. L'utilisation d'un catalyseur \u00e0 base de palladium m\u00e9tallique permet d'\u00e9viter l'utilisation d'un catalyseur \u00e0 base de mercure m\u00e9tallique (\u00e9quation 4) [6]. Cette r\u00e9action est plus significative car le produit peut subir d'autres r\u00e9actions de condensation ou de m\u00e9tath\u00e8se des ol\u00e9fines [7,8].<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.biochemsafebuy.com\/static\/kindeditor-4.1.10\/attached\/image\/20191127\/20191127095200_82254.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>L'\u00e9ther \u00e9thylvinylique et l'hydroxyle allylique subissent une r\u00e9action de transfert de vinyle pour g\u00e9n\u00e9rer le produit \u00e9ther vinylique correspondant. La r\u00e9action est g\u00e9n\u00e9ralement achev\u00e9e sous la catalyse de l'ac\u00e9tate de mercure. Le chauffage du produit dans le tolu\u00e8ne ou le xyl\u00e8ne peut induire le r\u00e9arrangement de Claisen correspondant, ce qui conf\u00e8re \u00e0 la r\u00e9action une valeur synth\u00e9tique importante. Dans des circonstances normales, le processus de r\u00e9action en deux \u00e9tapes peut \u00eatre achev\u00e9 dans les conditions de la \"cuisson en une seule casserole\" (\u00e9quation 5, \u00e9quation 6) [9~11].<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.biochemsafebuy.com\/static\/kindeditor-4.1.10\/attached\/image\/20191127\/20191127095310_54634.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>En pr\u00e9sence de catalyseurs de type acide de Lewis, l'\u00e9ther \u00e9thylvinylique peut \u00e9galement subir la r\u00e9action de cyclisation correspondante [12,13].<\/p>\n\n\n<!-- lc-commercial-start -->\n<h2>Une liste de contr\u00f4le pratique pour les d\u00e9cisions de formulation de rev\u00eatements<\/h2>\n<p>Dans les travaux de rev\u00eatement conventionnels, les acheteurs techniques progressent g\u00e9n\u00e9ralement le plus rapidement lorsqu'ils d\u00e9finissent d'abord l'objectif de performance du film, puis examinent la rh\u00e9ologie, la compatibilit\u00e9 du substrat, les additifs et la durabilit\u00e9 \u00e0 long terme comme un syst\u00e8me unique, plut\u00f4t que comme des ajustements isol\u00e9s.<\/p>\n<ul>\n<li><strong>Commencez \u00e0 partir du sc\u00e9nario d'application :<\/strong> Le mobilier, le rev\u00eatement en poudre, la peinture industrielle et les syst\u00e8mes \u00e0 base d'eau r\u00e9compensent souvent des priorit\u00e9s de formulation diff\u00e9rentes.<\/li>\n<li><strong>V\u00e9rifier la qualit\u00e9 de surface et la stabilit\u00e9 du proc\u00e9d\u00e9 ensemble :<\/strong> Le nivellement, le mouillage, le contr\u00f4le de la mousse et le s\u00e9chage interagissent souvent fortement.<\/li>\n<li><strong>Revoir le film apr\u00e8s gu\u00e9rison ou s\u00e9chage complet :<\/strong> L'adh\u00e9sion, la duret\u00e9, la r\u00e9sistance aux intemp\u00e9ries et la stabilit\u00e9 de la couleur d\u00e9cident g\u00e9n\u00e9ralement du r\u00e9sultat commercial.<\/li>\n<li><strong>Utiliser un d\u00e9pistage additif cibl\u00e9 :<\/strong> les additifs mouillants, dispersants, antimousses et anti-usure fonctionnent mieux lorsque le d\u00e9faut est clairement d\u00e9fini.<\/li>\n<\/ul>\n<h3>R\u00e9f\u00e9rences de produits recommand\u00e9es<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiaf-094\/\">CHLUMIAF 094<\/a>:<\/strong> Un r\u00e9f\u00e9rence anti-mousse \u00e9quilibr\u00e9 pour les rev\u00eatements \u00e0 base d'eau et de nombreux \u00e9crans de contr\u00f4le de mousse g\u00e9n\u00e9raux.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiaf-3062\/\">CHLUMIAF 3062<\/a>:<\/strong> Utile lorsque la compatibilit\u00e9 de l'encre d'impression et de l'encre UV est importante dans le tamis anti-mousse.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiaf-3037\/\">CHLUMIAF 3037<\/a>:<\/strong> Une option de d\u00e9sa\u00e9ration de processus plus puissante lorsque la mousse persistante survit \u00e0 des conditions plus difficiles.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiwe-3280\/\">CHLUMIWE 3280<\/a>:<\/strong> Un agent mouillant de r\u00e9f\u00e9rence puissant pour les encres, les rev\u00eatements et le mouillage des substrats difficiles.<\/li>\n<\/ul>\n<h3>FAQ pour les acheteurs et les formulateurs<\/h3>\n<p><strong>Pourquoi un rev\u00eatement qui a un bon aspect initial peut-il quand m\u00eame s'user plus tard ?<\/strong><br \/>Parce que de nombreux d\u00e9fauts n'apparaissent qu'apr\u00e8s le durcissement complet, le stockage ou l'exposition en service, lorsque l'adh\u00e9rence, la flexibilit\u00e9 ou la r\u00e9sistance aux intemp\u00e9ries deviennent le facteur limitant.<\/p>\n<p><strong>Les additifs de rev\u00eatement doivent-ils \u00eatre choisis un par un en dehors de la formule compl\u00e8te ?<\/strong><br \/>Il est g\u00e9n\u00e9ralement plus s\u00fbr de les tester dans la formule r\u00e9elle car le choix de la r\u00e9sine, les pigments et le reste du syst\u00e8me d'additifs peuvent modifier le r\u00e9sultat.<\/p>\n<!-- lc-commercial-end -->","protected":false},"excerpt":{"rendered":"<p>\u3010English name\u3011Ethyl Vinyl Ether \u3010Molecular formula\u3011 C4H8O \u3010Molecular Weight\u301172.11 \u3010CAS Registration Number\u3011[109-92-2] \u3010Structural formula\u3011CH3CH2OCH=CH2 [Physical properties] bp 33 oC, d 0.753 g\/cm3. It is soluble in most organic solvents and<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-4937","post","type-post","status-publish","format-standard","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Commonly used reagents-ethyl vinyl ether - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"\u3010English name\u3011Ethyl Vinyl Ether \u3010Molecular formula\u3011 C4H8O \u3010Molecular Weight\u301172.11 \u3010CAS Registration Number\u3011[109-92-2] \u3010Structural formula\u3011CH3CH2OCH=CH2...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangchemical.com\/fr\/commonly-used-reagents-ethyl-vinyl-ether\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Commonly used reagents-ethyl vinyl ether - 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