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7th configurational isomers - CM1012 Engineer Chemistry...

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1 CM1012 – Engineer Chemistry Chapter 9 in Burrow, Halman, Parsons, Pilling, Price ‘E/Z Isomerism’ Dr Hai Deng Room 034 Meston Building Email: [email protected]
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2 Conformations of butane
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3 Conformations of cyclopropane head2right sp 3 carbons in cyclic molecules are often forced to deviate from the ideal tetrahedral angle (109.5 ° ), resulting in angle strain head2right eclipsing interactions with neighbouring atoms create torsional strain , which is the reason that most cyclic hydrocarbons are not planar * * of course, cyclopropane is planar - three points define a plane!
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4 H H H H H H H H pucker the ring slightly increases angle strain, but considerably reduces torsional strain molecular model of cyclobutane torsional strain H H H H H H H H torsional strain planar conformation C-C-C bond angle = 90° butterfly conformation C-C-C bond angle = 88° Conformations of cyclobutane head2right sp 3 carbons in cyclic molecules are often forced to deviate from the ideal tetrahedral angle (109.5 ° ), resulting in angle strain head2right eclipsing interactions with neighbouring atoms create torsional strain , which is the reason that most cyclic hydrocarbons are not planar
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5 Conformations of cyclopentane head2right sp 3 carbons in cyclic molecules are often forced to deviate from the ideal tetrahedral angle (109.5 ° ), resulting in angle strain head2right eclipsing interactions with neighbouring atoms create torsional strain , which is the reason that most cyclic hydrocarbons are not planar
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6 Conformations of cyclohexane head2right sp 3 carbons in cyclic molecules are often forced to deviate from the ideal tetrahedral angle (109.5 ° ), resulting in angle strain head2right eclipsing interactions with neighbouring atoms create torsional strain , which is the reason that most cyclic hydrocarbons are not planar
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7 Conformations of cyclohexane
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8 Axial and equatorial C-H bonds in cyclohexane
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9 H H H H H H H H H H H H H H H H H H H H H
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