Elektronenstoßinduzierte Fragmentierung einiger Dibromoxabicycloalkane

Abstract

Fragmentation of Some Dibromooxabicycloalkanes on Electron Impact The dibromooxabicycloalkanes 1a to 1e, 2a and 2b, which are available from cycloalkadienes, undergo a characteristic fragmentation in electron impact mass spectrometry. The most important primary process is a CBr‐cleavage; in addition an important concurrent fragmentation appears in 1c as a result of αCC‐cleavage.

Retracted: Design and synthesis of two epoxide derivatives from 3‐ethynylaniline

“…On the other hand, it should be mentioned that these epoxides could be used as chemical tools in either biological models or as intermediaries in the preparation of several drugs, as happens with other epoxide analogues. [ 37–41 ]…”

In Pursuit ofcis,cis,cis‐Cyclonona‐2,5,8‐triene‐1,4,7‐trione – An Adventure in Medium‐Sized Ring Chemistry

“…[30] In the cases of dibromoene 24a {m/z = 211 (100), 179 (22) Clearly, the bromine-free C 9 H 7 O 3 + and C 9 H 6 O 3 -ions produced in the vapour phase upon electron-impact ionization are compatible in their compositions with their assignment as protonated and anionic forms of the C 9 H 6 O 3 target molecule 2. It is understood, though, that these ions might, or even probably, represent a collection of monocyclic or even bi(poly)cyclic isomers with cis-and trans-C=C double bonds.…”