{"id":307,"date":"2013-08-29T02:12:00","date_gmt":"2013-08-29T02:12:00","guid":{"rendered":"http:\/\/www.studyorgo.com\/blog\/?p=307"},"modified":"2014-02-21T03:22:01","modified_gmt":"2014-02-21T03:22:01","slug":"free-radical-halogenation-module-part-1-the-mechanism","status":"publish","type":"post","link":"https:\/\/www.studyorgo.com\/blog\/free-radical-halogenation-module-part-1-the-mechanism\/","title":{"rendered":"Free Radical Halogenation Module: Part 1: The Mechanism"},"content":{"rendered":"<p>This is the first part of a multi-part module on Free Radical Halogenation.<\/p>\n<p>&nbsp;<\/p>\n<p>There are THREE critical steps to free radical reactions &#8211; Memorize!<\/p>\n<p><b>1) Initiation<\/b>: The Br2 single bond is broken by high energy ligh (hv) to form radicals placing one electron on each atom.<\/p>\n<p><a href=\"http:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-308\" alt=\"Free Radical Halogenation Module Pic 1\" src=\"http:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-1.png\" width=\"227\" height=\"39\" \/><\/a><\/p>\n<p><b>2) Propagation:<\/b> (Hint: One radical reacts with a sigle bond to form another radical, thus propigating the radical species to drive the reaction forward.<\/p>\n<p>a) Radical Br abstracts one hydrogen from a C-H bond in propane to form radical propane and HBr.<\/p>\n<p><a href=\"http:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-309\" alt=\"Free Radical Halogenation Module Pic 2\" src=\"http:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-2.png\" width=\"270\" height=\"48\" \/><\/a><\/p>\n<p>b) Radical propane asbracts one Br from Br2 to form the bromoalkane and radical Br, thus restoring the reactants for another round as shown in step 2a.<\/p>\n<p><a href=\"http:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-310\" alt=\"Free Radical Halogenation Module Pic 3\" src=\"http:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-3-300x51.png\" width=\"300\" height=\"51\" srcset=\"https:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-3-300x51.png 300w, https:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-3.png 352w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><b>3) Termination:<\/b> Any two radicals combine to form a single bond.\u00a0 These species will be in low abundance. Hint: Radicals are destroyed by combining two radicals to form a single bond.\u00a0 This eliminates the radical necessary for radical alkane formation (green boxes) as shown in step 2a and ends the reaction.<\/p>\n<p><a href=\"http:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-4.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-311\" alt=\"Free Radical Halogenation Module Pic 4\" src=\"http:\/\/www.studyorgo.com\/blog\/wp-content\/uploads\/2013\/08\/Free-Radical-Halogenation-Module-Pic-4.png\" width=\"197\" height=\"186\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>There are multiple examples of this reaction to review in the <a href=\"http:\/\/www.studyorgo.com\/browse-reactions.php?show=all\">StudyOrgo.com Study Mode<\/a>. When ready, test your knowledge in the<a href=\"http:\/\/www.studyorgo.com\/quiz.php\"> StudyOrgo.com Quiz Mode<\/a>.<\/p>\n<p>Not a member yet? <a href=\"https:\/\/www.studyorgo.com\/signup.php\">Sign-Up today!<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is the first part of a multi-part module on Free Radical Halogenation. &nbsp; There are THREE critical steps to free radical reactions &#8211; Memorize! 1) Initiation: The Br2 single bond is broken by high energy ligh (hv) to form radicals placing one electron on each atom. 2) Propagation: (Hint: One radical reacts with a [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-307","post","type-post","status-publish","format-standard","hentry","category-organic-chemistry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/posts\/307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/comments?post=307"}],"version-history":[{"count":7,"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/posts\/307\/revisions"}],"predecessor-version":[{"id":352,"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/posts\/307\/revisions\/352"}],"wp:attachment":[{"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/media?parent=307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/categories?post=307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.studyorgo.com\/blog\/wp-json\/wp\/v2\/tags?post=307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}