Benzaldehyde By Bromation of Benzal Acohol

Benzaldehyde from Benzyl Bromide

Soduim bromide is sold at most stores as hth spa Brom-Start and can be treated with HCL acid to produce Hbr gas bubbled into distilled H2O to produce 47.6% HBr acid.
2 grams Benzyl Acohol and 6 grams of concentrated HBr acid are mixed and slowly heated to 60 C for about 20 minutes. It will separate into two layers, the yield of Benzyl Bromide is around 70% bp. 198-199 C.
39.701 ml of Ethanol is added to 5.293 ml of Hydrogen Peroxide 30% in a reaction flask while stiring.
Into this is added 2 grams Benzyl Bromide and refluxed for 3 hours - allowed to cool – 89% yeild of Benzaldehyde
The boiling point of Benzyl Bromide is 198-199 C and Benzaldehyde 178.1 C, distill at 180 C and excess Benzyl Bromide comes off and Benzaldehyde remains behind.
1. Benzyl Acohol can be bought on eBay
2. Ethanol is Everclear at the liquor store
3. Sodium bromide at Walmart
4. Hydrogen Peroxide 30% at wardsci.com (home science site for kids)

Quote: Originally posted by cal

The boiling point of Benzyl Bromide is 198-199 C and Benzaldehyde 178.1 C, distill at 180 C and excess Benzyl Bromide comes off and Benzaldehyde remains behind.

Quote: Originally posted by cal

Benzaldehyde from Benzyl Bromide Sodium bromide is sold at most stores as hth spa Brom-Start and can be treated with HCL acid to produce Hbr gas bubbled into distilled H2O to produce 47.6% HBr acid.