Comments on: Why are halogens ortho- para- directors?

By: Panashe Hazel

Panashe Hazel — Tue, 21 Mar 2023 18:52:41 +0000

Thank you

By: Deepak

Deepak — Sun, 22 Dec 2019 18:14:01 +0000

Nitroso group are not exactly deactivating group they are segregated as chamelian group which behave as activating as well as deactivating groups
Nitroso group can able exbiht both type of mesmeric effects.

By: James Ashenhurst

James Ashenhurst — Thu, 14 Feb 2019 09:44:55 +0000

In reply to Yogesh Oza.

It’s a positive “formal” charge. Chlorine is still more electronegative than carbon, and is still partially negative. Here’s a post I wrote on why not to trust formal charge: https://www.masterorganicchemistry.com/2011/11/15/how_to_use_electronegativity/

By: Yogesh Oza

Yogesh Oza — Sun, 08 Apr 2018 13:13:05 +0000

In the fifth figure from top, chlorine is shown to suffer positive charge. With 3 electron pairs as well as a double bond, how chlorine can become electron deficient?

By: James

James — Wed, 14 Mar 2018 14:44:00 +0000

In reply to Ian Hunt. shoot. Thank you.

By: Ian Hunt

Ian Hunt — Wed, 07 Mar 2018 22:34:14 +0000

The left structure in the figure with the Cl acting as an e-donor on the benzene ring during EArS has too many e around the Cl. One of the lone pairs has been used in the resonance interaction….

By: Matthew Pierce

Matthew Pierce — Tue, 06 Mar 2018 05:48:59 +0000

Here is a fun blog post here with some related discussion of the nitroso group, but sadly no experimental data: https://www.ch.imperial.ac.uk/rzepa/blog/?p=7234

It is mostly an article about the first curved arrows ever drawn. But near the end there is an interesting discussion about how geometry of the molecule changes between ground state and transition state. You alluded to it in your pictures.