University:
Brigham Young University
Course:
CHEM 102 | Concepts of Chemistry
Academic year:

2023
Views:

475

Pages:

4
Author:

InterstellarInsight

Meso Compounds :- These are defined as the Compound which contain two ore mone Chinnal Carbon atom and are optically inactive due to Presence of plane of symmetry. In such compound, the rotation due to one halt of the molecule is Cancelled rotation due to other half of molecule in opposite direction. The net rotationin meso Compound is Zero. eg. 2,3-dichlorobutane CH-CH-CH-4 3 * Case-1 (Molecule with dissimilar Chirnal Centre) :- No. of optically active isomert = No. of meso compound = 0 Total no. off Stereoisomer = 2 +0 = 2" 27 e.g. 2,3-dibromo Pentane Case-2 (Molecule with Bimilar Chiral Centre) :- No. of optically active isomern No. of mesocompound = 22-1 n-1 Total no. of stenes isumen = 2"" 27-1 6-1 +2 e.g. Tantaric acid HOOC-CH-H-COOH CH OH Case-3 When the molecule is Symmetric & has odd nu. of Chital Carbon:- No. of optically active is omern = ガーリ 2 - 22 No. of meso Compound 22 no. n-l Total of steneo is omen = 2 - 22 n- +2 27-1 eg. Glutaric acid HOOC-CH-CH-CH-COOH Erythro & Thireo Nomencleature:- ~ Isomer with identical group on Same Bide arte Called Erythro isomert. different/ Isomen with identical group on opposite side are Called Thireo isomer.