The C-alkylation reaction of three reductive alkylating agents prepare
d from 2-methylanthraquinone by 2-nitropropane anion is shown to proce
ed by the S(RN)1 mechanism. The S(RN)1 mechanism is confirmed by the l
eaving group effect and the inhibitory effects of dioxygen, p-dinitrob
enzene, cupric chloride and di-tert-butylnitroxide. This reaction can
be extended to 1-methyl-3-nitropyrrolidin-2-one anion.