For the following complexes optical isomers have to be drawn if present. (a) trans- [ C o ( e n ) 2 ( N O 2 ) 2 ] + (b) cis- [ C o ( e n ) 2 ( N O 2 ) 2 ] + Concept Introduction: Co-ordination compounds exhibit structural isomerism and stereoisomerism. Stereoisomerism deals with three dimensional spatial arrangements of atoms or groups of a molecule. There are two types of stereoisomerism – Geometric isomerism and optical isomerism. A cis isomer has two same ligands lying adjacent to each other whereas a trans isomer has two same ligands lying opposite to each other. In optical isomerism the isomer that rotates the plane of the polarized light in clockwise direction is termed as d-isomer and the isomer rotates the plane of the polarized light in anti-clockwise direction is l-isomer. These isomers are called optical isomers and they are non-superimposable mirror images.

Question

1. For each of the reaction "railroads" below, you are either asked to give the structure(s) of the starting material(s) or product(s), or provide reagents/conditions to accomplish the transformation, as indicated by the boxes. a. NaOMe H+ .CO,H HO₂C MeOH (excess) MeOH H3C Br يع CH3 1. LiAlH4 2. H3O+ 3. PBг3 H3C 1. Et-Li 2. H3O+ -CO₂Me -CO₂Me OH CH3 CH3 ল CH3

Answer 1

Question

Chapter 22.5, Problem 22.4E

(a)

Interpretation Introduction

Interpretation:

For the following complexes optical isomers have to be drawn if present.

(a) trans- [Co(en)2(NO2)2]+

(b) cis- [Co(en)2(NO2)2]+

Concept Introduction:

Co-ordination compounds exhibit structural isomerism and stereoisomerism. Stereoisomerism deals with three dimensional spatial arrangements of atoms or groups of a molecule. There are two types of stereoisomerism – Geometric isomerism and optical isomerism.

A cis isomer has two same ligands lying adjacent to each other whereas a trans isomer has two same ligands lying opposite to each other.

In optical isomerism the isomer that rotates the plane of the polarized light in clockwise direction is termed as d-isomer and the isomer rotates the plane of the polarized light in anti-clockwise direction is l-isomer. These isomers are called optical isomers and they are non-superimposable mirror images.

(b)

Interpretation Introduction

Interpretation:

For the following complexes optical isomers have to be drawn if present.

(a) trans- [Co(en)2(NO2)2]+

(b) cis- [Co(en)2(NO2)2]+

Concept Introduction:

Co-ordination compounds exhibit structural isomerism and stereoisomerism. Stereoisomerism deals with three dimensional spatial arrangements of atoms or groups of a molecule. There are two types of stereoisomerism – Geometric isomerism and optical isomerism.

A cis isomer has two same ligands lying adjacent to each other whereas a trans isomer has two same ligands lying opposite to each other.

In optical isomerism the isomer that rotates the plane of the polarized light in clockwise direction is termed as d-isomer and the isomer rotates the plane of the polarized light in anti-clockwise direction is l-isomer. These isomers are called optical isomers and they are non-superimposable mirror images.

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