CHEM 281 Study Guide - Final Guide: Stereoisomerism, Deprotonation, Alkane
29 Oct 2020
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Nucleophile lewis base (has negative charge or lone pair pulls other compound) Increasing s character makes hydrogen more acidic. Amines are weak bases and hcn is a weak acid. Set of enantiomers have identical physical properties: same boiling point, melting point, colour, solubility, density, except they rotate plane of polarized light in opposite directions. Set of enantiomers have identical chemical properties: reactivity, except when they react with other enantiomers compounds. There are several ways to distinguish enantiomers: r,s, d,l. A polarimeter is used on optically active substances. If r is -ve, s is the same but +ve. Stereoisomers that aren"t mirror images of each other. Cis and trans alkene isomers are diastereomers (geometric isomers) Cis and trans cycloalkanes isomers are diastereomers. Total number of stereoisomers = 2n (n = # of chiral centres) An achiral molecule that contains chiral centres and has an internal plane of symmetry. A 50:50 mixture of enantiomers: optically inactive.
