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Topic: Substitution of toluene for benzene in formation of an amide  (Read 342 times)

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Offline Babcock_Hall

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Substitution of toluene for benzene in formation of an amide
« on: November 02, 2021, 03:36:59 PM »
Okawara T et al. 1982 Chem. Pharm. Bull. 30(4):1225-1233.
https://www.jstage.jst.go.jp/article/cpb1958/30/4/30_4_1225/_pdf
We will attempt to react a 3-carbon dibrominated acid chloride with aniline to make an amide.  The procedure that we will follow uses benzene as the solvent.  One of their substrates is quite similar to ours.  I was thinking about substituting toluene for benzene but leaving the rest of the procedure unmodified.  Does this sound reasonable?

« Last Edit: November 02, 2021, 03:50:02 PM by Babcock_Hall »

Offline wildfyr

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Re: Substitution of toluene for benzene in formation of an amide
« Reply #1 on: November 02, 2021, 09:42:27 PM »
Should work!

Offline phth

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Re: Substitution of toluene for benzene in formation of an amide
« Reply #2 on: November 03, 2021, 01:56:19 AM »
benzene is not worth working with. Probably the same at the end of the day. Rather handle mercury IMHO.

Offline rolnor

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Re: Substitution of toluene for benzene in formation of an amide
« Reply #3 on: November 03, 2021, 05:04:49 AM »
Toluene, DCM, DCE, it will work.

Offline DrCMS

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Re: Substitution of toluene for benzene in formation of an amide
« Reply #4 on: November 03, 2021, 11:49:50 AM »
benzene is not worth working with.

but it smells so nice.

Offline Babcock_Hall

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Re: Substitution of toluene for benzene in formation of an amide
« Reply #5 on: November 03, 2021, 12:56:34 PM »
As long as we are discussing this reaction, the authors did not indicate the use of a drop of DMF as a catalyst.  However my perusal of Tietze and Eicher's book mentioned this in several related reactions (synthesis of esters or amides from acid chlorides).  I am tempted to leave DMF out for simplicity, unless my yield is poor.
« Last Edit: November 03, 2021, 01:12:11 PM by Babcock_Hall »

Offline rolnor

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Re: Substitution of toluene for benzene in formation of an amide
« Reply #6 on: November 03, 2021, 02:31:15 PM »
Acid chlorides+amines are usually the simplest possible reactions, no catalyst is neccesary.

Offline BobfromNC

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Re: Substitution of toluene for benzene in formation of an amide
« Reply #7 on: November 10, 2021, 02:51:39 PM »
Just did an amide formation using toluene for benzene, worked fine.  Have also used DCM instead of benzene, it worked fine also.   I just consider the solubility and workup for each reaction.

And a small drop of DMF for making the acid chloride with oxalyl chloride is fine, but not needed for many other reactions.   

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