O- Organic synthesis =)

Question 1

Suggest why chemists usually aim to design production methods
* with fewer steps
* with a high percentage atom economy

(2)

Answer 1

• few steps: better yield/ ↓ energy used
• high % economy: ↓ waste/ ↓ pollution

Question 2

The amine CH3CH2CH2NH2 can be prepared by two different routes.
Route A is a two-stage process and starts from CH3CH2Br.
Route B is a one-stage process and starts from CH3CH2CH2Br.
Give one disadvantage of Route A and one disadvantage of Route B. (2)

Answer 2

A- KCN = toxic// ↓ yield ∵ 2 steps
B- further reaction (substitution) likely