{"id":208634,"date":"2025-04-27T20:30:24","date_gmt":"2025-04-27T20:30:24","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=208634"},"modified":"2025-04-27T20:30:26","modified_gmt":"2025-04-27T20:30:26","slug":"draw-a-six-carbon-alkyne-that-can-exist-as-diastereomers-4","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/04\/27\/draw-a-six-carbon-alkyne-that-can-exist-as-diastereomers-4\/","title":{"rendered":"Draw a six-carbon alkyne that can exist as diastereomers"},"content":{"rendered":"\n<p>Draw a six-carbon alkyne that can exist as diastereomers. You do not need to specify wedge or dashed bonds<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>Alright, here\u2019s the direct answer first:<\/p>\n\n\n\n<p>A <strong>six-carbon alkyne<\/strong> that can exist as <strong>diastereomers<\/strong> is:<br><strong>3-Hexyne-2,4-diol<\/strong>, or drawn structurally:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CH\u2261C-CH(OH)-CH(OH)-CH\u2082-CH\u2083<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation (about 300 words):<\/h3>\n\n\n\n<p>To find a six-carbon alkyne that can have <strong>diastereomers<\/strong>, we must first know what diastereomers are: <strong>Diastereomers are stereoisomers that are not mirror images<\/strong> of each other and have different configurations at one or more (but not all) of their stereocenters. For a molecule to have diastereomers, it must have <strong>at least two stereocenters<\/strong> (chiral centers).<\/p>\n\n\n\n<p>An <strong>alkyne<\/strong> has a <strong>triple bond<\/strong>, which is linear (180\u00b0) and cannot itself be chiral. So, chirality must come from <strong>other parts<\/strong> of the molecule\u2014specifically from attached groups that create tetrahedral carbons (sp\u00b3 hybridized carbons) with four different substituents.<\/p>\n\n\n\n<p>Starting with <strong>hex-3-yne (CH\u2083-C\u2261C-CH\u2082-CH\u2082-CH\u2083)<\/strong>, we notice there\u2019s a triple bond between carbons 2 and 3, but no stereocenters.<\/p>\n\n\n\n<p>To introduce stereocenters, we <strong>add substituents<\/strong> such as hydroxyl (-OH) groups onto sp\u00b3 carbons adjacent to the triple bond. For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Add OH groups to <strong>C-2<\/strong> and <strong>C-4<\/strong>.<\/li>\n\n\n\n<li>Now C-2 and C-4 each have four different groups: H, OH, an alkyl group toward the triple bond, and another carbon chain.<\/li>\n<\/ul>\n\n\n\n<p>Thus, <strong>3-hexyne-2,4-diol<\/strong> (CH\u2261C-CH(OH)-CH(OH)-CH\u2082-CH\u2083) has <strong>two chiral centers<\/strong> and can have <strong>diastereomers<\/strong>. Specifically:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>(2R,4R) and (2S,4S) forms are enantiomers (mirror images).<\/li>\n\n\n\n<li>(2R,4S) and (2S,4R) forms are diastereomers to the enantiomers.<\/li>\n<\/ul>\n\n\n\n<p>Thus, this molecule can exist as a set of <strong>diastereomers<\/strong>.<\/p>\n\n\n\n<p>In summary, adding functional groups like OH near the alkyne enables the creation of chiral centers, allowing diastereomeric forms in a six-carbon chain.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>Draw a six-carbon alkyne that can exist as diastereomers. You do not need to specify wedge or dashed bonds The correct answer and explanation is : Alright, here\u2019s the direct answer first: A six-carbon alkyne that can exist as diastereomers is:3-Hexyne-2,4-diol, or drawn structurally: Explanation (about 300 words): To find a six-carbon alkyne that can [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-208634","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/208634","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=208634"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/208634\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=208634"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=208634"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=208634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}