CHEM 222

Hunter College, CUNY - CHEMISTRY 222Chap 16 Pi Systems F18 HW KEY Last document update:   ago

Org II (Hamann) Chapter 17 HW – Pi Systems Name 1 Draw the structures of the following compounds a) cyclopentadiene (explain why the numbers for the double bonds (1,3-), which are formally require d, are usually omitted. I.e., why is only one isomer possible; why not 1,2- or 1,4-cyclopentadiene? 1,2-cyclopentadiene would contain an allene, a linear C=C=C unit that would make the ring too strained. 1,4- cyclopentadiene would actually be the same molecule, but numbered incorrectly. Hence the use...