University:
York University
Course:
CHEM 1000 | Chemical Structure
Academic year:

2021
Views:

478

Pages:

3
Author:

Niklas

Lecture 7 (02/02/21) RECALL: Constitutional Isomer: Same formula, different connectivity Example: C4H8 2-Butene Same connectivity 1 is a constitutional isomer to 2 and 3 2 and 3 have the same connectivity but different arrangements of atoms in space → "Stereoisomers" CIS/TRANS Descriptions of Stereochemistry Applies only to Rings/Alkenes with identical substituents Alkenes: Trans: Substituents on opposite sides Cis: Substituents on the same side Chirality: Property of an object: An object is chiral when its mirror image is non-superimposable on the object (ex: your hands). Structural Features: Object w/ low symmetry can (but not always) be chiral. Chiral molecules cannot have a plane of symmetry or inversion center. How many stereoisomers can this molecule have? Max # Stereoisomers = 2^3 = 8 Can only be a chiral center if the substituents are different from each other!