Unusual mass spectrometric fragmentation ofN,N′-diethyl-N,N′-diphenylurea
摘要:
AbstractThe electron impact mass spectrum of N,N′‐diethyl‐N,N′‐diphenylurea contains the ion m/z 164 which is of low abundance at normal energy of ionizing electrons but prominent at 15‐20eV. The mechanism of its formation has been revealed by means of labelled compounds. It is rationalized in terms of an unusual formation of styrene lost as a neutral molecule.
synthesize 2,6-di-, and 2,2',6-trisubstituted morpholines via the reduction of oxabicyclic tetrazoles under mild conditions is described. The reaction proved successful for a wide range of tetrazoles, including sterically encumbered ones harboring gem-substituents on tertiary carbon centers. The mechanism for the decades-old reduction of tetrazoles to secondary amines is elucidated.
A method for the solidphasesynthesis of arylamines is reported. The method involves a palladium mediated coupling reaction between aryl bromides and amines. The products are isolated in high purity and good yields. This method should prove to be a useful tool for constructing combinatorial libraries containing the arylamine moiety.
Unusual mass spectrometric fragmentation ofN,N′-diethyl-N,N′-diphenylurea
作者:V. Hanuš、Z. Horák、V. Tolman
DOI:10.1002/oms.1210170109
日期:1982.1
AbstractThe electron impact mass spectrum of N,N′‐diethyl‐N,N′‐diphenylurea contains the ion m/z 164 which is of low abundance at normal energy of ionizing electrons but prominent at 15‐20eV. The mechanism of its formation has been revealed by means of labelled compounds. It is rationalized in terms of an unusual formation of styrene lost as a neutral molecule.