Making 4-Hydroxybenzoic acid from PABA

I make 4-hydroxybenzoic acid, and isomer of salicylic acid, from 4-aminobenzoic acid, better known as PABA. I first convert it to the diazo salt using sodium nitrite and sulfuric acid, then I decompose that with heat and acid to replace the N2+ with OH.

[crabcrab]

You deserve much more subscribers, man! You lab space, glass, equipment and skills are awesome ! Good luck and please continue. 🙂

[TomsLab]

It's been a while since my last video. I took a small break and filmed four videos, but three of them I decided not to use. Thanks for the continued support even when I didn't post. Also, I wish a warm welcome to the over 150 new subscribers since my last video!

[j_sum]

I am enjoying your channel. Just discovered it recently. There are a few things here that I should try.
Thanks.

[joewillmow]

Great video. Still failing Ap chem but at least I can use the sodium from my tears to season my T.V dinners.

[justusfelix]

Nice Video. I like this synthesis. Please make more organic chemistry and longer videos and synthesis!

[billsmathers]

Nicely done.

For an idea for what to do with the 4-hydroxybenzoic acid product, maybe you could make a paraben by esterifying it with methanol, ethanol, or 1-propanol. Then you could test its bacteriocidal properties with an agar plate.

[johnblacksuperchemist]

WOW GREAT gotta love those azo compounds. You should do the sandmeyer reaction next and make some 4.chlorobenzoic acid from 4.aminobenzoic acid. They are such similar reactions. I gotta put this one in my notes. Think so far i have only made one alcohol. Tert pentanol. I need to get off my lazy ass...lol.

[TomsLab]

Anyone think I should make a Tom's Lab Instagram or Snapchat?