Ytterbium used in synthesis

First time I have seen it used:



PS: From wiki the reason its used is: Lanthanide triflates are triflate salts of the lanthanide family with many uses in organic chemistry as Lewis acid catalysts. The catalysts act similarly to aluminium chloride or ferric chloride, but are stable in water, which makes it possible to use water as a solvent instead of organic solvents.

[Edited on 5/24/2020 by wg48temp9]