Talk:Cycloaddition

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IUPAC recommends:

[x+y] for the involved electrons

and

(x+y) for the involved atoms.

So:

Diels Alder is [2+4] and (2+4)

1,3-dipolar cycloaddition is [2+4] and (2+3).

Actually, many people still use [2+3] for the 1,3-dipolar cycloaddition, but I think, the difference or the existence of both variants should be part of the text.

:I think that the [n#s + n#s] notation is better, where n is pi or sigma depending on what bonds are involved, # is the number of electrons, and s is either s or a for suprafacial or antarofacial..--Shniken1 (talk) 03:46, 10 March 2008 (UTC)

related cyclizations

There's a page for this sort of stuff -- it's the pericyclic reactions page. No need to call attention to 2+2+2 (this is so far, exclusively metal-catalyzed) or ene (why is that special over, say, claisen)?

Two notations

I clarified the two different notations. It all links to the IUPAC Gold Book but that should be sufficient. I also divided the photochemical and thermal reactions into different sections.

The Simple English article for this is actually quite good and may be worth porting to here.

Roches (talk) 00:55, 26 February 2014 (UTC)

as a non-chemist...

This page really incomprehensible. I admit to being terrible at chemistry but the use of "cyclic adduct" (undoubtedly a very basic concept), makes the definition appear circular to me.

I realize that this is cited as "standard definition".

As I understand it, it means a molecule/adduct is attached to a bond.

Then it can either break that bond to replace it with two new sigma-bonds to the adduct or leaving the original sigma-bond intact but forming two new ones from the pi-bonds (forming something like a triangle).

Would it be possible to simplify this by putting the formal definition later in the text, starting with an explanation in more layman's terms?

--Jaapkroe (talk) 14:01, 2 July 2014 (UTC)

the relevant internal links should be : cycloaddition => organic reaction between two unsaturated compounds to form a cyclic compound as the adduct. In this process Pi bonds in the reagents are replaced by sigma bonds in the product. This should make it more understandable V8rik (talk) 21:35, 2 July 2014 (UTC)