A good example is (CH3)3CNO, known formally as 2-methyl-2-nitrosopropane, or "t"-BuNO, which is prepared by the following sequence::(CH3)3CNH2 → (CH3)3CNO2:(CH3)3CNO2 → (CH3)3CNHOH:(CH3)3CNHOH → (CH3)3CNO(CH3)3CNO is blue and exists in solution in equilibrium with its dimer, which is colorless, m.p.