Hmm. Are you claiming this based on chemistry expertise and test results, or this just what your intuition tells you? Because sometimes the real world does not behave intuitively.
Google turned up a quick citation:
“UL94 avgas has the same chemistry as 100LL — but without the use of tetraethyllead (LEAD) or its equally toxic scavenger ethylene dibromide”
Source? Swift Fuels FAQs