Talk:(4+3) cycloaddition

Proper nomenclature for cycloadditions
Square brackets are used to indicate the number of electrons in each component taking part in a cycloadditions. In this case, the allyl cation component has two pi electrons and the diene has four, hence this should be a [4+2] cycloaddition.

To show the number of atoms in each component, parentheses should be used. Therefore it is also a (4+3) cycloaddition. I'm afraid that as far as I'm aware, the entire article has gotten it the wrong way round.

See the IUPAC Gold Book on "cycloaddition": DOI:10.1351/goldbook.C01496 Yongrenjie (talk) 22:34, 19 February 2017 (UTC)