What is localized pi bonding?

1 Answer
Dec 13, 2017

Consider "2-butylene"2-butylene versus "1,3-butadiene..."1,3-butadiene...

Explanation:

And so we gots....H_3C-CH=CH-CH_3H3CCH=CHCH3 versus H_2C=CH-CH=CH_2H2C=CHCH=CH2. The pi-"bond"πbond of the former creature is LOCALIZED between C_2C2 and C_3C3...and of course this could give rise to 2 geometric isomers, which are?

The pi-"bonds"πbonds of the LATTER are delocalized over 4-centres...certainly addition of 1 equiv HXHX would give rise to 1,4-"addition"1,4addition to some extent....