音说不末精天手 Organic Chemistry,6th Edition L.G.Wade,Jr. Chapter 4 Structure and Stereochemistry of Alkanes By Junru Wang Email:wangjr07@163.com
CONTENT Classification of Hydrocarbons ■Physical properties Reactions Mechanisms of Alkanes Structure Conformation of Alkanes Conformation of Cycloalkanes
Key Notes ■Mechanisms ■Conformation ■Ring strain ■Conformers ■Cis-trans isomers
Classification Review Compound Type Functional Group Example alkanes none(no double or triple bonds) CH3-CH2-CH3,propane alkenes C=C double bond CH2=CH-CH3,propene alkynes -C=C-triple bond CH2CH aromatics benzene ring ethylbenzene
Sec 1 Physical Properties Solubility:hydrophobic Density:less than 1 g/mL Boiling points increase with increasing carbons (little less for branched chains). Melting points increase with increasing carbons(less for odd-number of carbons)