re/si face of alkenes How to determine whether the face of the attached alkene is re or si?
If assigning priorities in regard to the left C atom it is re, but for the right C atom it is si. How is it actually determined?
I’m pretty sure that this depends on the atom attacked. Most attacks on double bond are stepwise to a certain extent. And even when they aren’t, the absolute configuration should be discussed on a per-atom basis.

But if you have a concerted reaction and want to label both: (2si,3re).