CHEM 2565 : Exam 2 Material
Document Summary
Ring strain increase in energy due to geometric constraints: cyclohexane in its chair conformation there is very little strain, chair conformation. = all bond angles are 111 and c- c bonds. H: positions, axial (are in reference to the ring) : = straight up and down: perpendicular to plane this position is where quashed interactions occur. Most substituents do not want to be here: equitovial straight out to side, bonds lie parallel, ring flip to plane of the ring. = conformational flip that converts equilibrial and axial carbons. Occurs in multiple steps if equal in energy / stability theyrapidly intwconvertat room temp. (cid:15482)t as substituents get larger , the ring flip will no longer occur this is due to : size increase with # of atoms increases with atomic radii. Once bond length is long enough , the chair conformation is more stable. I: mono substituted a chair forms are not equivalent increases as 0 bonds increase, disubstituted.
