Scheme 1.
Redox independent [4+2] cycloaddition of diols, ketols and diones with isoprene.a
aYields are of material isolated by silica gel chromatography. BIPHEP = 2,2′-bis-(diphenylphosphino)-1,1′-biphenyl. bRuH2CO(PPh3)3 (6 mol%).
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