Chemistry 1027A/B Lecture Notes - Stereochemistry, Chart Attack, Racemic Mixture
29 Oct 2012
School
Department
Course
Professor
Document Summary
Friday lecture will be like a mass tutorial. Pi bonds exists in many things wherever they occur they do the reactions we have studied. Halogens on molecules act like hydrogen"s and have a valence of 1. General formula: cnh2n +1x: count x as an h for units of unsaturation calculation. C3h4br2 = 2 bromines 1 unit of unsaturation. 2-chlorobutane or sec-butyl chloride common name been in use for so long that they are accepted as well. Physical properties: and sp3 c-x bond is polar- want a good dipole. Sp2 c-x bonds are much less polar. Sp c-x bonds are the least polar: nature does not like halogens. Preparation of haloalkanes: prepare halides by addition reactions to pi binds. Substitution reactions: nucleophilic substitution in which the halogen atom is replaced by a nucleophilic group. If replace hydrogen with halogen- halogen wants the electrons. Because of the dipole the saturated carbon does not react.
