Structure of 1,3-Butadiene small amount of overlap partial double bond 1.34A H H H H 1.48A 1.34A H Copyright10 Pearson Prentice Hall,inc. a Single bond is shorter than 1.54 A. Electrons are delocalized over molecule There is a small amount of overlap across the central C-C bond,giving it a partial double bond character. Chapter 15 5Chapter 15 5 Structure of 1,3-Butadiene ▪ Single bond is shorter than 1.54 Å. ▪ Electrons are delocalized over molecule. ▪ There is a small amount of overlap across the central C—C bond, giving it a partial double bond character