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Establishing new strategies for carbon chain elongation (CCE) and advanced functional group construction is of sustainable interest.Accelerated in vacuum(~10-5 Torr)by a waveform(~300 kHz),a bared sodiated acetone(A,m/z 81)can closely approach to another one(B,m/z 81)for CCE reaction,in which the elimination of a methyl cation and the coupling of two carbonyl carbon groups simultaneously occurred to produce sodium 2-methyl-butane-2,3-diolate)-3-ium(m/z 147).