{"id":44617,"date":"2025-06-30T17:54:54","date_gmt":"2025-06-30T17:54:54","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=44617"},"modified":"2025-06-30T17:54:55","modified_gmt":"2025-06-30T17:54:55","slug":"how-many-gauche-butane-interactions-are-present-in-this-chair-conformation","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/how-many-gauche-butane-interactions-are-present-in-this-chair-conformation\/","title":{"rendered":"How many gauche butane interactions are present in this chair conformation"},"content":{"rendered":"\n

How many gauche butane interactions are present in this chair conformation? 01 04 00 03 02<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

The correct answer is 4<\/strong>.<\/p>\n\n\n\n

Here is a step-by-step explanation:<\/p>\n\n\n\n

A gauche butane interaction is a type of steric strain that occurs when two methyl groups (or other non-hydrogen groups) in a butane-like fragment are positioned with a 60\u00b0 dihedral angle. In cyclohexane chair conformations, these interactions are a key factor in determining the stability of different conformers. We count these interactions to estimate the overall steric strain introduced by substituents.<\/p>\n\n\n\n

    \n
  1. Identify the Substituents and Their Positions:<\/strong>
    First, let’s analyze the provided chair conformation. It is a substituted cyclohexane with three methyl groups.\n
      \n
    • One methyl group is in an\u00a0axial<\/strong>\u00a0position (pointing straight up).<\/li>\n\n\n\n
    • A second methyl group is also in an\u00a0axial<\/strong>\u00a0position (pointing straight down).<\/li>\n\n\n\n
    • The third methyl group is in an\u00a0equatorial<\/strong>\u00a0position (pointing out to the side, and slightly down).<\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • Apply the Rules for Counting Gauche Butane Interactions:<\/strong>
      The standard method for counting these interactions in a substituted cyclohexane is as follows:\n
        \n
      • Axial Substituents:<\/strong>\u00a0Each axial substituent (like a methyl group) creates two gauche butane interactions with the carbon-carbon bonds of the ring. This is because the axial substituent is gauche to the ring bonds located two carbons away (at the C-3 and C-5 positions relative to the substituent).<\/li>\n\n\n\n
      • Equatorial Substituents:<\/strong>\u00a0An equatorial substituent is in an anti conformation relative to these same ring bonds. An anti conformation has a 180\u00b0 dihedral angle and introduces no steric strain. Therefore, an equatorial substituent contributes zero gauche butane interactions with the ring.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
      • Calculate the Total Interactions for This Molecule:<\/strong>
        Using the rules above, we can count the interactions for each substituent in the given molecule:
        • First axial methyl group:<\/strong>\u00a0Contributes 2 gauche butane interactions.<\/li>
        • Second axial methyl group:<\/strong>\u00a0Contributes 2 gauche butane interactions.<\/li>
        • Equatorial methyl group:<\/strong>\u00a0Contributes 0 gauche butane interactions.<\/li><\/ul>The total number of gauche butane interactions is the sum of the contributions from each substituent:
          Total = 2 + 2 + 0 = 4<\/li>\n<\/ol>\n\n\n\n

          Therefore, there are a total of 4<\/strong> gauche butane interactions present in this chair conformation. It is important to note that the very severe steric clash between the two axial methyl groups (a 1,3-diaxial interaction) is a different and more significant type of strain, not typically counted under the “gauche butane” label in this context.<\/p>\n\n\n\n

          \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

          How many gauche butane interactions are present in this chair conformation? 01 04 00 03 02 The Correct Answer and Explanation is: The correct answer is 4. Here is a step-by-step explanation: A gauche butane interaction is a type of steric strain that occurs when two methyl groups (or other non-hydrogen groups) in a butane-like fragment […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44617","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/44617","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=44617"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/44617\/revisions"}],"predecessor-version":[{"id":44626,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/44617\/revisions\/44626"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=44617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=44617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=44617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}