Org Steriochem Flashcards
1
Q
Enantiomer
A
- differ at each stereocenter, non superimposable mirror images
2
Q
Diastereomer
A
Non mirror image non identical
- 2 or more stereoisomers have different configurations at one more more equivalent stereocenters
3
Q
Constitutional isomer
A
Molecule has same number of atoms of each element, logically distinct bonds between them
- same formula, different connectivity
4
Q
Epimer
A
- differ at one of mult chiral centers, not all chiral centers
5
Q
Meso compound
A
- mult chiral centers but create plane of symmetry
6
Q
How does d/l system work?
A
Polarimeter
- d: dexto R +
- l: Levo L -
7
Q
R/S categorization
A
- by prioritization from atomic number
8
Q
D/L projection for carbs
A
- D: right
- L: left
- look at highest number chiral carbon, usually C5
9
Q
What’s needed for a compound to be considered aromatic?
A
Conjugated, planar, cyclic
- huckel’s rule: 4n+2
- lone pair = 2 pi electrons
10
Q
Fisher projection and absolute configuration
A
- horizontal items off of central atom are denoted as wedges, coming out of page towards you
- thus, if lowest substituent is one of these items, reverse end abs configuration
