3,4-ditert-butyl-2,2,5,5-tetramethylhex-3-ene

Tetra-tert-butylethylene is a hypothetical organic compound, a hydrocarbon with formula C18H36, or ((H3C-)3C-)2C=C(-C(-CH3)3)2. As the name indicates, its molecular structure can be viewed as an ethylene molecule H2C=CH2 with the four hydrogens replaced by tert-butyl -C(-CH3)3 groups.