Electron impact mass spectral studies of 2a,4-disubstituted 2-phthalimido-2,2a,3,4-tetrahydro-1H-azeto[2,1-d][1,5]benzothiazepin-1-ones

Author(s):  
Jiaxi Xu ◽  
Gang Zuo
1984 ◽  
Vol 62 (3) ◽  
pp. 554-560 ◽  
Author(s):  
D. S. Wulfman ◽  
James Roberts ◽  
Dennis K. Henderson ◽  
J. C. Romine ◽  
R. S. McDaniel Jr. ◽  
...  

Electron impact (EI) mass spectral studies of methyl diazoacetate, ethyl diazoacetate (1), methyl diazoacetoacetate (2), and dimethyl diazomalonate (3) indicate that loss of N2 is exceedingly difficult from the parent ion and was observed only with 3. Diazoacetylacetone exhibits an appreciable (M − 28)+. ExactMass and metastable transitions indicate fragmentation occurs in part via 1,2,3-oxadiazolium ion-radicals (6) or α-lactones (7) to furnish N2O and hyponitrite esters. (M − 28)+ from 1 results from loss of ethylene.


1975 ◽  
Vol 2 (2) ◽  
pp. 82-89 ◽  
Author(s):  
Roland M. De Sagher ◽  
André P. De Leenheer ◽  
Albert E. Claeys ◽  
Annie A. Cruyl

2001 ◽  
Vol 15 (9) ◽  
pp. 721-729 ◽  
Author(s):  
I. Fenesan ◽  
Rodica Popescu ◽  
C.T. Supuran ◽  
Simona Nicoara ◽  
Monica Culea ◽  
...  

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