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Unimolecular rearrangements of ketene-O,O-acetals and fragmentations occurring in the gas phase

✍ Scribed by Martha S. Morales-Ríos; Perla Y. López-Camacho; Carlos O. Jacobo-Cabral; Nadia A. Pérez-Rojas; Joel J. Trujillo-Serrato; Eleuterio Burgueño-Tapia; Oscar R. Suárez-Castillo; Pedro Joseph-Nathan

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
259 KB
Volume
46
Category
Article
ISSN
1076-5174

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✦ Synopsis

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. Copyright © 2011 John Wiley & Sons, Ltd.

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