Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Cis-trans isomerization of a segment of a polyene. (Upper) The Hula-Twist (HT) process showing the translocation of one C-H unit and the sliding sideways movement of the remaining polyene chain. (Lower) The conventional one-bond-flip (OBF) process showing the turning over of one-half of the molecule.
