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Hydrogen-mediated coupling of gaseous acetylene to N-benzenesulfonyl aldimine 13a (Ar = p-NO2Ph, Bs = Benzenesulfonyl) using triphenylacetic acid as co-catalyst. (A): ESI mass spectrum with proposed structural assignment of observed ions. (B): CAD mass spectrum of the ion of m/z 1255 with proposed structural assignment of observed ions.
