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A comparison of electron impact mass spectrometry of isomeric pyranocoumarins (pyrano[3,2‐ c ][1]benzopyran‐5‐ones) and pyranochromones (pyrano[2,3‐ b ][1]benzopyran‐5‐ones)
Author(s) -
Bravo Pierfrancesco,
Ticozzi Calimero,
Daolio Sergio,
Traldi Pietro
Publication year - 1985
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210201209
Subject(s) - benzopyran , chemistry , hydroxymethyl , mass , ion , mass spectrometry , mass spectrum , stereochemistry , computational chemistry , organic chemistry , chromatography
The mass spectrometric behaviour of two pairs of isomeric 2,2‐dimethylpyrano[3,2‐ c ][1]benzopyran‐5‐ones (pyranocoumarins) and 2,2‐dimethylpyrano[2,3‐ b ][1]benzopyran‐5‐ones (pyranochromones) and four pairs of isomeric 2‐hydroxymethyl‐2‐methylpyrano[3,2‐ c ][1]benzopyran‐5‐ones (pyranocoumarins) and 2‐hydroxymethyl‐2‐methylpyrano[2,3‐ b ][1] benzopyran‐5‐ones (pyranochromones) has been studied in detail with the aid of exact mass measurements, linked scans, collisionally activated decompositions and deuterium labelling experiments. The presence in both series of compounds of the same ions derived by structural interconversion of both molecular ions is emphasized, and structural information on the ions [C 7 H 5 O 2 ] + ( m / z 121), highly characteristic for these classes of compounds, as for 4‐hydroxycoumarins, is reported.