Comments on: Free Radical Initiation: Why Is “Light” Or “Heat” Required? https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/ Wed, 07 Dec 2022 17:45:47 +0000 hourly 1 https://wordpress.org/?v=6.6.2 By: hamad munir https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-606756 Wed, 13 Oct 2021 19:37:17 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-606756 thanks so much, I really very like your article because this article is very informative for me and is also provide very deep and correct information about light and light energy.

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-552503 Fri, 12 Apr 2019 21:42:54 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-552503 In reply to Ritoma.

Yes, thank you. Fixed

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-548733 Tue, 05 Mar 2019 21:54:12 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-548733 In reply to Alfredo.

Let me have another crack at it. Homolytic cleavage usually happens when you’re breaking a bond between two identical atoms which have a weak bond, such as Br-Br or RO-OR. They have equal electronegativity and therefore the bond isn’t polarized toward one of the atoms. The result is that the bond breaks such that the electrons are distributed symmetrically.

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-548731 Tue, 05 Mar 2019 21:51:08 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-548731 In reply to Taha.

Glad you found the article useful, Taha.

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-548730 Tue, 05 Mar 2019 21:50:15 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-548730 In reply to Steven.

The role of heat in these cases is to fragment a weak bond such as O-O or Br-Br .
Heat, by itself, may excite an electron from HOMO to LUMO in a diene, but this method can lead to a lot more side reactions than if one were just to use light.

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-548728 Tue, 05 Mar 2019 21:48:31 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-548728 In reply to Jennifer Kim.

Probably a different reaction then.

]]> By: Ritoma https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-533017 Fri, 25 May 2018 15:49:36 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-533017 v minor – but you seemed to have used ‘gamma’ instead of ‘nu’ for representing energy/light.

]]> By: Taha https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-532304 Sat, 12 May 2018 10:52:05 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-532304 Just wanna say thanks :)

]]> By: Alfredo https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-504391 Thu, 09 Feb 2017 19:43:02 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-504391 I bumped into your explanation while searching an answer to the question “why homolytic (why not heterolytic)?” And I can’t find the kind of answer I’m seeking.

]]> By: Steven https://www.masterorganicchemistry.com/2013/08/30/radical-initiation-why-is-light-or-heat-required/#comment-464000 Fri, 17 Jun 2016 19:01:08 +0000 https://www.masterorganicchemistry.com/?p=7521#comment-464000 If heat can excite an electron from HOMO to LUMO for radical reactions, why can’t heat excite an electron from HOMO to LUMO in a diene?

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