A Study on Mass Spectra of Multifunctional Group Molecule (1)—The Mass Spectra (EI) of Mannich Bases of Alkyl Phenol

The mass Spectra (EI) and the interpretation of five Mannich bases ofalkyl phenol are reported in this article. Three (n=3,4,5) of them 2,4, (C_2H_(2n+1))_2NCH_2(n-C_(12)H_(25))C_6H_3(OH)·HCl, (n=1,2,3,4,5) are newcompounds. No data about their mass spectra have been published in litera-ture. As a consequence of the interpretation of mass spectra (EI) we know thatthere are intense peak M~+., characteristic fragments both m/z 164+28(n-1)(n=1,2) with aliphatic amine-phenol structure and m/z 121 with the type oftropliumion-phenol structure. The I%～n curves of them show that the rela-tive intensity vary decreasingly (or increasingly) with n to be appeared ascarbon atom number contained in the alkyl combined with nitrogen atom. TheEI mass spectra show that a series of weak alkyl fragmentations characterizemass spectra of alkyl combined with nitrogen atom, and coupling ions for R~+and M-R~(?+). behave as cleavage feature of long chain alkyl (C_(12)H_(25)). As aresult of mass migration, metastabe ion detection (V/B, V/B~2 linked scan)and accurate mass, it were disscussed for respective fragmentationmechanism and the mass spectral feature of mutifunctional group moleculecontained -OH、-NR_2、-Ar、-ArOH、-ArCH_2NR_2、and -R.