[BilloRani2012]

The transformation shown below can be accomplished in TWO reaction steps.?
The transformation shown below can be accomplished in TWO reaction steps. From the following list, select the two reagents (or sets of reagents) which would most effectively bring about this conversion. Reagents:

1. Conc H2SO4/heat
2. CN-
3. KMnO4
4. (i) CH3MgI (ii) H3O+
5. PBr3
6. (i) BH3 (ii) H2O2
7. CH3CH2O-/CH3CH2OH
8. H2O/H+
9. OH-/H2O
10. (i) O3 (ii) Zn
11. NaBH4
12. HCl
13. KI
14. Na
15. CH3CH2Br

the chemical eqaution is:

CH3-CH2-CHO --> (Step 1) --> (Step 2) --> CH3-CH2-CHBR-CH3
So we are going from a propanal (aldehyde) --> 2-bromobutane (alkyl halide)

So would step 1 be: H20/H+
and would step 2 be: PBr3

[Dan]

So would step 1 be: H20/H+
and would step 2 be: PBr3

Explain your answer - show your working, this is forum policy.

Note that your starting material contains three carbon atoms and your product contains four. Neither H₂)/H⁺ or PBr₃ contain carbon. Do not guess randomly.

Start by identifying potential candidates for A and B in the sequence:

Propanal -> A -> B -> 2-bromobutane

[helenn]

Also the topic title is Grignard reagents, that might be a hint.

[CZPF]

two steps of (4) and (5) is a effective way.