Home » Ask & Discuss » Chemistry
« Back to Discussion

Organic Chemistry

Hot goIITian

Joined:	21 Feb 2012
Post:	109

12 Mar 2012 18:17:24 IST

0 People liked this

450

Convert phenol to hexamethylbenzene in one step

Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Chemistry , Organic Chemistry

Convert:

To:

Comments (4)

dhilipan1995

Cool goIITian

Joined: 1 Oct 2011

Posts: 58

12 Mar 2012 19:10:51 IST

Like 0 people liked this

phenol+ 6CH3OH in presence of aluminium oxide gives the answer

Niladri Chakraborty

Hot goIITian

Joined: 21 Feb 2012

Posts: 109

12 Mar 2012 19:55:08 IST

Like 0 people liked this

forgot to mention.. the yield of the product should be more than 50 percent.

ronnie

Scorching goIITian

Joined: 18 Feb 2012

Posts: 264

13 Mar 2012 23:27:42 IST

Like 0 people liked this

i dont know the reagent but am curious to know how can both stp up and oidation b done at d same tym....waiting 4 ur response niladri

Madhusudan Chavan

Forum Expert

Joined: 9 Mar 2007

Posts: 2801

14 Mar 2012 16:30:50 IST

Like 0 people liked this

A solution of 100 g. (1.06 moles) of phenol in 1 l. of methanol is allowed to drop at a rate of 110 ml. per hour (Note 1) over an activated alumina catalyst (Note 2) heated to 530° (Note 3). The exit from the hot tube is attached to a receiver arranged to lead by-product gases to an efficient hood (Note 4). After addition of the methanol solution is finished, the pale yellow product is transferred to a Büchner funnel and washed with methanol. The yield of crude product melting at 135–145° is 112–115 g. (65–67%). Recrystallization from ethanol (50 g. in 650 ml.)gives 85% recovery or from benzene (50 g. in 130 ml.) gives 60% recovery of colorless hexamethylbenzene, m.p. 165–166°.

2. Notes

1. The submitters used a rate of 250 ml. per hour with a 2-in.-diameter tube, 16 in. long, packed with 300 g. of alumina, and a temperature in the catalyst bed about 370–380°. The checkers used 34 g. of alumina packed in a 7/8-in.-diameter tube 13 in. long.

2. The submitters used 4- to 8-mesh alumina from Peter Spence and Sons, Widnes, Lancashire, England. The checkers used 8- to 14-mesh Alorco H-41 obtained from the Aluminum Company of America, 1200 Alcoa Building, Pittsburgh 19, Pennsylvania.

3. Automatically controlling the outside of the catalyst tube to 370–400° gives a hot spot in the catalyst bed of 530° at the rate specified in equipment used by the checkers.

4. Gases formed in the reaction included carbon monoxide, methane, and hydrogen. The exact equation for the reaction is not known.

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team