CHAPTER4_2015.pdf - Cycloalkanes(CH2)n not CnH2n 2 Abundant in nature rigid scaffolding Names Cycloalkanes Cyclopropane etc Substituents Cycloalkyl

CHAPTER4_2015.pdf - Cycloalkanes(CH2)n not CnH2n 2 Abundant...

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Cycloalkanes Abundant in nature: rigid scaffolding . Names: Cyclo alkanes Cyclopropane, , , etc. Substituents: Cycloalkyl . Substituted cycloalkanes: single substituent is automatically at C1 . Ethylcyclobutane (no # needed) Alkylcycloalkane or cycloalkylalkane? Larger stem controls: 1 2 3 4 5 1- Cyclopropyl - pentane (CH 2 ) n not C n H 2 n +2
Cycloalkanes have two sides: up , down . With two or more substituents, new type of isomerism: Same side: cis Opposite sides: trans Stereoisomers CH 3 CH 3 Cis -1,2-dimethyl- cyclopropane Br F Trans -1-bromo-3- fluorocyclohexane Stereoisomers
Note: This definition includes all rotamers (anti, gauche, etc.). Operational (practical) definition:

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