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Unformatted text preview: 2. Number the atoms in the chain 3. Identify and number the substituents 3.5 Properties of Alkanes Sheet1 Page 2 not very reactive- need extreme conditions (free radicals): heat, peroxides, or UV radiation 3.6 Conformations of Ethane/ 3.7 Conformations of Other Alkanes torsional strain: associated with eclipsing interactions steric strain: two electron clouds too close together Anti Conformation: staggered to give least steric strain, 180 degrees Gauche Conformation: local energy minima, 60 degrees Stereoisomers: no change in connectivity Confomational Isomers: different energy due to bond rotation Angle strain: expansion or compression of the angle away from the ideal (rings) chair conformation of cyclohexane eliminates angle strain, torsional strain, and steric strain 1,3-diaxial interactions: sterics ring flips: a functional group switches from axial to equatorial or vice-versa...
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