Stereochemistry Stereochemistry Any chemistry which involves orientation in

Stereochemistry

Stereochemistry • Any chemistry which involves orientation in space

Symmetry • Referring to anything that can be divided on some plane into identical parts

Symmetry • In molecules, planes of symmetry can be determined along any bond axis

Symmetric Compounds • Compounds with at least one plane of symmetry

Name the Following C C C-C-C-C C-C

Asymmetric Compounds • Compounds with no plane of symmetry

Symmetric Compounds • The mirror images of symmetric compounds are identical

Symmetric Compounds • All completely symmetric compounds are non -polar

Asymmetric Compounds • The mirror images of asymmetric compounds are not identical. They are isomers

Asymmetric Compounds • Asymmetric compounds can be polar if the bonds are polar

Polarity of Hydrocarbons • Hydrocarbons are non-polar

Optical Isomers • Mirror images of asymmetric compounds are optical isomers or stereoisomers

Stereoisomerism of C • A carbon center must be bound to 4 different things to be asymmetric

Stereoisomerism of C • Any carbon center bound to 3 or less things has at least one plane of symmetry

Stereoisomerism of C • Use modeling

Stereoisomerism of Carbon Chains • The constituents on two adjacent carbons spend more time in the staggered position

Stereoisomerism of Carbon Chains • Use modeling to show aligned & staggered positions

Diffusion • Movement down an energy gradient

Thermochemistry • Compounds will eventually move to the lowest possible energy state (the most stable state)

Thermochemistry of Organic Compounds • Stability is sometimes determined by how the compound interferes with its surroundings

Thermochemistry of Organic Compounds • To increase stability, organic compounds tend to curl up

Thermochemistry of Organic Compounds • Organic compounds ring structures are more stable than their corresponding straight chain structures

Draw an optical isomer of: H 3 C-CH 2 H 3 C-C-CH 2 -CH 3 H

Draw & Name at least 5 isomers of C 6 H 14