Why are the last two compounds called meso diastereomers? I understand the meso part, but aren't diastereomers compounds that are neither mirror images or superimposable? It's clear the two Fischer projections are mirror images to me.

Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
Chapter6: Alkanes & Alkenes
Section: Chapter Questions
Problem 23E: up an example (not appearing in this ChemActivity) of a pair of molecules that are a)constitutional...
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Why are the last two compounds called meso diastereomers? I understand the meso part, but aren't diastereomers compounds that are neither mirror images or superimposable? It's clear the two Fischer projections are mirror images to me.

CH3
CH,
CH;
CH,
Br
H-
H-
-Br
Br
-H-
H-
Br
mi
H-
Br
Br
H-
Br
H-
H
Br
syf
CH,
CH
CH;
CH3
(2R,3R)
(2S,3S)
(2R,3S)
(2S,3R)
enantiomers
same compound!
the (+) diastereomer
the meso diastereomer
diastereomers
Transcribed Image Text:CH3 CH, CH; CH, Br H- H- -Br Br -H- H- Br mi H- Br Br H- Br H- H Br syf CH, CH CH; CH3 (2R,3R) (2S,3S) (2R,3S) (2S,3R) enantiomers same compound! the (+) diastereomer the meso diastereomer diastereomers
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