{"id":860,"date":"2011-01-24T16:49:00","date_gmt":"2011-01-24T16:49:00","guid":{"rendered":"https:\/\/psiconautica.org\/wordpress\/?p=860"},"modified":"2022-02-01T19:34:14","modified_gmt":"2022-02-01T19:34:14","slug":"25-dimethoxypropenylbenzene-from-s-asarone","status":"publish","type":"post","link":"https:\/\/psiconautica.org\/wordpress\/quimica-avanzada\/25-dimethoxypropenylbenzene-from-s-asarone\/","title":{"rendered":"2,5-Dimethoxypropenylbenzene from \u00df-Asarone"},"content":{"rendered":"<h2>2,5-Dimethoxypropenylbenzene from \u00df-Asarone<\/h2>\n<p>&nbsp;<\/p>\n<p><b>Cis-beta-asarone to trans-alpha-asarone<\/b><\/p>\n<p>A mixture of cis-beta-asarone (70 g) alcohol (100 ml) and selenium dioxide (10 g) was heated on the water-bath for 30 min. The filtered solution was poured into water, the oil dissolved in ether, and the dried etheral extract evaporated; the residue partly crystallized, and distillation gave trans-alpha-asarone (60g).<\/p>\n<p><b>Cis-beta-asarone to 2,5-dimethoxypropenylbenzene<\/b><\/p>\n<p>A mixture of \u00df-asarone (20g), alcohol (50 ml) and selenium dioxide (5 g) was boiled for 5 hours. The product isloated by ether in the usual manner gave an oil, which on distillation under 8 mmHg gave two fractions: (i) bp 140-145\u00ba, d30\u00ba\/30\u00ba 1.052, n20\u00ba\/d 1.5451; (ii) bp 145-150\u00ba.<\/p>\n<p>From the former, a picrate was prepared, crystallizing from alcohol in orange-red feathery leaflets, mp 87\u00ba. Decomposition of the picrate with alkali gave 2,5-dimethoxypropenylbenzene, bp 128-129\u00ba\/4 mm., d30\u00ba\/30\u00ba 1.041, n30\u00ba\/d 1.5548. The 2,5-dimethoxypropenylbenzene pseudonitrosite, mp 118\u00ba, was a pale yellow powder.<\/p>\n<p>&nbsp;<\/p>\n<h3>References<\/h3>\n<p><b>[1]<\/b> Rao &amp; Subramaniam, Journal of the Chemical Society 1338 (1937)<\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>2,5-Dimethoxypropenylbenzene from \u00df-Asarone &nbsp; Cis-beta-asarone to trans-alpha-asarone A mixture of cis-beta-asarone (70 g) alcohol (100 ml) and selenium dioxide (10 g) was heated on the water-bath for 30 min. The filtered solution was poured into water, the oil dissolved in ether, and the dried etheral extract evaporated; the residue partly crystallized, and distillation gave trans-alpha-asarone [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1644,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-860","post","type-post","status-publish","format-standard","has-post-thumbnail","category-quimica-avanzada"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2,5-Dimethoxypropenylbenzene from \u00df-Asarone - Psicon\u00e1utica<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2,5-Dimethoxypropenylbenzene from \u00df-Asarone - Psicon\u00e1utica\" \/>\n<meta property=\"og:description\" content=\"2,5-Dimethoxypropenylbenzene from \u00df-Asarone &nbsp; Cis-beta-asarone to trans-alpha-asarone A mixture of cis-beta-asarone (70 g) alcohol (100 ml) and selenium dioxide (10 g) was heated on the water-bath for 30 min. 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