Syn Addition
( \newcommand{\kernel}{\mathrm{null}\,}\)
An addition reaction of an alkene or an alkyne in which the net reaction is addition of two ligands to the multiple-bonded carbon atoms from the same face of the multiple bond is called a syn addition; one in which the net reaction is addition of the two ligands from the opposite faces of the multiple bond is called an anti addition.
eg. 1:
net reaction:
eg. 2:
net reaction: