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Topic: Photolysis mechanism of acetone  (Read 1126 times)

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Offline myii

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Photolysis mechanism of acetone
« on: May 15, 2021, 11:53:31 AM »
Hi

Can someone show me what the mechanism would be for the photolysis of acetone? Should methyl radicals form?

Offline rolnor

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Offline myii

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Re: Photolysis mechanism of acetone
« Reply #2 on: May 15, 2021, 02:18:21 PM »
https://pubs.acs.org/doi/10.1021/j100841a010#

Thanks for this :) so would the mechanism be just a free radical mechanism? As I am little confused about something, if the question asked 'show the photolysis mechanism of acetone' would you need to draw a mechanism so showing half arrows etc or do you think the mechanism shown on the paper you have given me is sufficient?

Offline Babcock_Hall

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Re: Photolysis mechanism of acetone
« Reply #3 on: May 15, 2021, 03:55:06 PM »
Drawing a mechanism on an exam generally entails including mechanistic arrows.

Offline myii

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Re: Photolysis mechanism of acetone
« Reply #4 on: May 16, 2021, 02:37:21 AM »
Drawing a mechanism on an exam generally entails including mechanistic arrows.

Ahhh ok, how would the arrows be drawn for the photolysis of acetone if this is the case?

Offline Babcock_Hall

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Re: Photolysis mechanism of acetone
« Reply #5 on: May 16, 2021, 11:09:24 AM »
Yes, and if the mechanism involves single electrons, one uses single-barbed arrows.

Offline myii

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Re: Photolysis mechanism of acetone
« Reply #6 on: May 19, 2021, 03:26:56 AM »
Yes, and if the mechanism involves single electrons, one uses single-barbed arrows.

Ah okay:), how would the mechanism look like I am really struggling still :( I know a radical is form from the acetone

Offline myii

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Re: Photolysis mechanism of acetone
« Reply #7 on: May 19, 2021, 07:39:22 AM »
Yes, and if the mechanism involves single electrons, one uses single-barbed arrows.

Would this be the mechanism?

Offline Babcock_Hall

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Re: Photolysis mechanism of acetone
« Reply #8 on: May 19, 2021, 09:27:59 AM »
Your drawing makes it looks as if everything happens in a single step.  The mechanism takes several steps, as shown at the link above.  I would use their mechanism as a starting point and add arrows. 

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