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.
Bold arrows refer to the direct reduction (mechanism A), dashed arrows depict (mechanism B), whereas plain arrows represent the condensation reduction routes (mechanism C).
