University:
Augusta University
Course:
CHEM 1441 | General Chemistry
Academic year:

2022
Views:

420

Pages:

1
Author:

elcopihuesn

Isomerism Stereoisomers – Same constitution (connectivity in space) but differ in spatial arrangement of atoms Constitutional Isomers – Different constitution Tautomers – isomers which differ only in the position of the protons and electrons and thus readily interconvert Diastereoisomers – Nonsuperimposable nonmirror images Enantiomers – Superimposable mirror images Geometric Isomers Rotamers / Conformers – Interconversion by rotation about single bond Epimers –differ in ABSOLUTE CONFIGURATION at only 1 stereogenic centre Diastereoisomers with > 1 stereogenic centre Meso Compounds – SUPERIMPOSABLE mirror images (ACHIRAL) Atropisomers – Arise due to hindered rotation about a single bond, where energy differences due to steric strain or other contributors create a barrier to rotation that is high enough to allow for isolation of individual conformers Anomers – cyclic monosaccharides differing only in C-1 configuration Chiral molecules – no planes or centres of symmetry Conformation – Spatial arrangement of atoms that distinguishes stereoisomers which can be interconverted via single bond rotation Prochiral – Atom capable of becoming a stereogenic centre via a single reaction step Configuration – Spatial arrangement of atoms that distinguishes stereoisomers, when differences in isomerism is NOT due to differences in CONFORMATION Axial – results from nonplaner arrangement of 4 groups in pairs about a CHIRAL axis Relative Absolute

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