Mass spectral fragmentation pattern of 2,2‐bipyridyls. Part V. 2,2′‐oxydipyridine

Abstract

The mass spectrum of 2,2′‐oxydipyridine obtained by electron impact is reported. The principal fragmentations involve loss of C2IIO and CO in addition to rupture of the central bonds. Molecular rearrangements accompany the fragmentations.

Comparison of Fragmentation Techniques for the Structural Characterization of Singly Charged Agrochemicals

“…44 Another peak at m/z 198.05251 in the EID spectrum corresponds to [C 10 H 7 F 3 N] + (0.017 ppm), and this could be produced from the benzene and pyridine rings combining and losing the ether linkage and 2 carbons. 50 The CAD fragments obtained for fluazifop acid are comparable to the findings reported by Bolygo and Boseley; 51 however, the peak they observed in nominal mass at m/z 254 was assigned as a cleavage corresponding to D (m/z 254.04245). The high resolution MS spectrum (Figures 3 and S3) displays two peaks with nominal mass 254, one corresponding to the cleavage at C (m/z 254.04245) and another to a rearrangement (m/z 254.07884) with relative intensities of 5.6% and 21.0%, respectively (Supporting Information: Tables S5 and S6), suggesting that the rearrangement is a major product in both CAD and EID fragmentation.…”

“…The peak at m / z 254.07873 in the CAD and EID spectra can be attributed to a methyl rearrangement onto the benzene ring with loss of the ether chain . Another peak at m / z 198.05251 in the EID spectrum corresponds to [C 10 H 7 F 3 N] + (0.017 ppm), and this could be produced from the benzene and pyridine rings combining and losing the ether linkage and 2 carbons …”

Notizen: 2,4′ -Oxybispyridine

“…the mass spectra of 2,2'-oxybispyridine [13] and 4,4'-oxybispyridine [14], The principal fragmentation routes from the molecular ion involve loss of HON to give a peak at mass 145 (14%; C9H7N0), loss of CO (mass 144; 45%; C9H8N2), loss of CO + C2H2 (mass 118; 9%; C7H6N2) and loss of CO + HCN (mass 117; 17%; C8H7N). The peaks in…”