Unimolecular rearrangements of ketene-O,O-acetals and fragmentations occurring in the gas phase |
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Authors: | Morales-Ríos Martha S López-Camacho Perla Y Jacobo-Cabral Carlos O Pérez-Rojas Nadia A Trujillo-Serrato Joel J Burgueño-Tapia Eleuterio Suárez-Castillo Oscar R Joseph-Nathan Pedro |
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Institution: | Departamento de Química Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14-740, México, D. F., 07000 Mexico. smorales@cinvestav.mx |
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Abstract: | Gas phase skeletal rearrangements of regioisomeric 3‐cyano‐2‐methoxy‐3a‐alkylfuro2,3‐b]‐ and 3,2‐b]indoles were evidenced by product ions M ? 32]+?, consistent with loss of methanol, on electron ionization in their mass spectra. The rearranged products occurring in gas phase were demonstrated to have elemental composition and fragmentation properties identical to those of authentic samples of 2‐indolyl cyanomalonates. Isotopic labeling experiments support the formation mechanism of the M ? 32]+? ion. Additional thermal gas‐phase reaction products were characterized by comparison with an authentic sample. Copyright © 2011 John Wiley & Sons, Ltd. |
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Keywords: | ketene acetal gas phase rearrangement thermal decarbomethoxylation indole EI‐ion trap |
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