{"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\/pt\/commonly-used-reagents-ethyl-vinyl-ether\/","title":{"rendered":"Reagentes comumente usados - \u00e9ter vin\u00edlico et\u00edlico"},"content":{"rendered":"<!-- lc-qa-start -->\n<p><strong>Resposta r\u00e1pida:<\/strong> For paint and coating topics, formulators usually compare flow, substrate fit, surface quality, and durability together because the same adjustment can improve one property while weakening another.<\/p>\n<!-- lc-qa-end -->\n\n\n<p>\u3010Nome em ingl\u00eas\u3011Ethyl Vinyl Ether<\/p>\n\n\n\n<p>\u3010F\u00f3rmula molecular\u3011 C4H8O<\/p>\n\n\n\n<p>\u3010Peso molecular\u301172,11<\/p>\n\n\n\n<p>\u3010N\u00famero de registro no CAS\u3011[109-92-2]<\/p>\n\n\n\n<p>\u3010F\u00f3rmula estrutural\u3011CH3CH2OCH=CH2<\/p>\n\n\n\n<p>[Propriedades f\u00edsicas] bp 33 oC, d 0,753 g\/cm3. \u00c9 sol\u00favel na maioria dos solventes org\u00e2nicos e pode ser usado em uma variedade de solventes org\u00e2nicos.<\/p>\n\n\n\n<p>[Prepara\u00e7\u00e3o e commodity] Esse reagente \u00e9 vendido em empresas de reagentes qu\u00edmicos no pa\u00eds e no exterior.<\/p>\n\n\n\n<p>[Precau\u00e7\u00f5es] Este reagente \u00e9 um produto qu\u00edmico altamente vol\u00e1til e inflam\u00e1vel. Recomenda-se armazen\u00e1-lo em um local seco e de baixa temperatura e us\u00e1-lo em uma capela de exaust\u00e3o.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>O \u00e9ter etilvin\u00edlico \u00e9 usado principalmente como grupo protetor do grupo hidroxila, reagente de transfer\u00eancia de vinil e participa da rea\u00e7\u00e3o de adi\u00e7\u00e3o de cicliza\u00e7\u00e3o na s\u00edntese org\u00e2nica.<\/p>\n\n\n\n<p>Entre os muitos grupos de prote\u00e7\u00e3o para grupos hidroxila, o \u00e9ter et\u00edlico \u03b1-etoxi (EE) formado por \u00e9ter et\u00edlico vin\u00edlico e hidroxila \u00e9 um dos grupos de prote\u00e7\u00e3o mais comumente usados e convenientes. A rea\u00e7\u00e3o geralmente requer um catalisador \u00e1cido forte, TFA e TsOH podem ser usados para essa finalidade, sendo que o mais comumente usado \u00e9 o PPTS. A rea\u00e7\u00e3o geralmente \u00e9 conclu\u00edda com agita\u00e7\u00e3o por v\u00e1rias horas em temperatura ambiente. Na maioria dos casos, o rendimento do produto \u00e9 superior a 95% (F\u00f3rmula 1) [1,2]. O grupo protetor EE pode facilmente concluir a rea\u00e7\u00e3o de desprote\u00e7\u00e3o em condi\u00e7\u00f5es \u00e1cidas. PPTS-EtOH e aq. HCl-MeOH s\u00e3o m\u00e9todos recomendados (Equa\u00e7\u00e3o 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>Sob a a\u00e7\u00e3o do catalisador derivado de acetato de merc\u00fario, o etil vinil \u00e9ter e a hidroxila passam por uma rea\u00e7\u00e3o de transfer\u00eancia de vinil para gerar o produto de vinil \u00e9ter correspondente (F\u00f3rmula 3) [5]. Se um catalisador de pal\u00e1dio met\u00e1lico for usado, ele pode efetivamente evitar o uso de um catalisador de merc\u00fario met\u00e1lico (Equa\u00e7\u00e3o 4) [6]. Essa rea\u00e7\u00e3o \u00e9 mais significativa porque o produto pode passar por outras rea\u00e7\u00f5es de condensa\u00e7\u00e3o ou metatese de olefinas [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>O etil vinil \u00e9ter e o alil hidroxila passam por uma rea\u00e7\u00e3o de transfer\u00eancia de vinil para gerar o produto de vinil \u00e9ter correspondente. A rea\u00e7\u00e3o geralmente \u00e9 conclu\u00edda sob a cat\u00e1lise de acetato de merc\u00fario. O aquecimento do produto em tolueno ou xileno pode induzir o rearranjo de Claisen correspondente, tornando a rea\u00e7\u00e3o de importante valor sint\u00e9tico. Em circunst\u00e2ncias normais, o processo de rea\u00e7\u00e3o em duas etapas pode ser conclu\u00eddo sob as condi\u00e7\u00f5es de \"cozimento em uma \u00fanica panela\" (Equa\u00e7\u00e3o 5, Equa\u00e7\u00e3o 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>Na presen\u00e7a de catalisadores de \u00e1cido de Lewis, o etil vinil \u00e9ter tamb\u00e9m pode sofrer a rea\u00e7\u00e3o de cicliza\u00e7\u00e3o correspondente [12,13].<\/p>\n\n\n<!-- lc-commercial-start -->\n<h2>A practical checklist for coating formulation decisions<\/h2>\n<p>In conventional coating work, technical buyers usually move fastest when they define the film-performance target first and then review rheology, substrate compatibility, additives, and long-term durability as one system instead of isolated tweaks.<\/p>\n<ul>\n<li><strong>Start from the application scenario:<\/strong> furniture, powder coating, industrial paint, and waterborne systems often reward different formulation priorities.<\/li>\n<li><strong>Check surface quality and process stability together:<\/strong> leveling, wetting, foam control, and drying often interact strongly.<\/li>\n<li><strong>Review the film after full cure or drying:<\/strong> adhesion, hardness, weatherability, and color stability usually decide the commercial result.<\/li>\n<li><strong>Use targeted additive screening:<\/strong> wetting, leveling, defoaming, and wear-resistance additives work best when the defect is clearly defined.<\/li>\n<\/ul>\n<h3>Refer\u00eancias de produtos recomendadas<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiaf-094\/\">CHLUMIAF 094<\/a>:<\/strong> Um antiespumante balanceado de refer\u00eancia para revestimentos \u00e0 base de \u00e1gua e muitas telas de controle de espuma de uso geral.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiaf-3062\/\">CHLUMIAF 3062<\/a>:<\/strong> Useful when printing-ink and UV-ink compatibility matter in the defoaming screen.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiaf-3037\/\">CHLUMIAF 3037<\/a>:<\/strong> Uma op\u00e7\u00e3o antiespumante mais forte para espumas persistentes que sobrevivem a condi\u00e7\u00f5es mais severas.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiwe-3280\/\">CHLUMIWE 3280<\/a>:<\/strong> Um referente forte de agente molhante para tintas, revestimentos e molhagem de substratos dif\u00edceis.<\/li>\n<\/ul>\n<h3>FAQ para compradores e formuladores<\/h3>\n<p><strong>Why can a coating with good initial appearance still fail later?<\/strong><br \/>Because many failures show up only after full cure, storage, or service exposure, when adhesion, flexibility, or weatherability becomes the limiting factor.<\/p>\n<p><strong>Should coating additives be chosen one by one outside the full formula?<\/strong><br \/>It is usually safer to screen them inside the real formula because resin choice, pigments, and the rest of the additive package can change the result.<\/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\/pt\/commonly-used-reagents-ethyl-vinyl-ether\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Commonly used reagents-ethyl vinyl ether - 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