Morales-Ríos MS, López-Camacho PY, Jacobo-Cabral CO, Pérez-Rojas NA, Trujillo-Serrato JJ, Burgueño-Tapia E, Suárez-Castillo OR, Joseph-Nathan P. Unimolecular rearrangements of ketene-O,O-acetals and fragmentations occurring in the gas phase.
JOURNAL OF MASS SPECTROMETRY : JMS 2011;
46:489-495. [PMID:
21500318 DOI:
10.1002/jms.1915]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Gas phase skeletal rearrangements of regioisomeric 3-cyano-2-methoxy-3a-alkylfuro[2,3-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.
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