S2Cl2 by chlorination with CuCl2 in MeCN?
Because of the formation of the acetonitrile-Cu+ complex, copper (II) is more strongly oxidizing in acetonitrile than in other common solvents. One
source puts it at +0.56 V versus the standard carbon electrode, which is comparable to bromine.
https://books.google.com/books?hl=en&lr=&id=rYAkAQAA...
There are a few examples of chlorination of relatively resistant substrates with the CuCl2-acetonitrile system, such as coumarins:
https://pubs.rsc.org/en/content/articlelanding/2022/ob/d2ob0... (yes I know this is photocatalysis)
S2Cl2 is also apparently compatible with acetonitrile:
https://www.sciencedirect.com/science/article/pii/S004040390...
So it's interesting to me whether CuCl2 in acetonitrile would be reactive enough to chlorinate sulfur, possibly with some help from light. Half-cell
potential is not a guarantee of reactivity, though.
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