video tutorial p-Nitrobenzoic acid from p-nitrotoluene using dichromate

Name: video tutorial - p-Nitrobenzoic acid from p-nitrotoluene using dichromate
Uploaded: 2025-12-11T09:03:44.354Z
Duration: 11 min 36 s
Description: In this video we're going to oxidize this to pyrro nitro benzoic acid.

Starting from pyrro nitro toluene, the video oxidizes it to pyrro nitro benzoic acid using potassium dichromate in sulfuric acid.
The reaction setup includes a pressure-equalized addition funnel, controlled acid addition, and heating with reflux; the mixture turns from milky to a brown color as dichromate dissolves.
After acid addition, the mixture is heated for about 20 more minutes with gentle reflux; distillate appears milky due to unreacted nitrotoluene.
Post-reaction workup involves cooling, precipitation by ice, filtration, and drying to give a crude green/brown solid (about 12 g) containing chromium salts.
Purification via a hydroxide treatment converts the product to its sodium salt, precipitating chromium as hydroxide; subsequent acidification with HCl regenerates the product as a green solid.
Final isolated product: 8.8 g of pyrro nitro benzoic acid, about 85% yield from starting nitrotoluene; color described as yellow, with trace chromium salts.
Note: process carries hazards (strong oxidant, heat, fumes); scale-up requires caution.