Behaviour of isomeric methyl ethyl and ethyl methyl halosuccinates under electron impact. Elimination of a halogen atom by a multi-step mechanism

1991 ◽  
Vol 26 (9) ◽  
pp. 793-798 ◽  
Author(s):  
D. Bornstein ◽  
A. Mandelbaum ◽  
I. Vidavsky ◽  
B. Domon ◽  
D. Mueller ◽  
...  
Keyword(s):  
Electron Impact ◽  
Halogen Atom ◽  
Methyl Ethyl ◽  
Ethyl Methyl ◽  
Step Mechanism ◽  
Isomeric Methyl

SiO2-POCl2 nano-particles promoted the synthesis of novel structure of alkyl 2-oxo-3,4-diaryloxazolidine-5-carboxylate derivatives

2020 ◽  
Vol 17 ◽  
Author(s):  
Mehdi Abaszadeh ◽  
Seyyed Jalal Roudbaraki ◽  
Hossein Yarahmadi ◽  
Majid Ghashang
Keyword(s):  
Nano Particles ◽  
Methyl Ethyl ◽  
Aniline Derivatives ◽  
Ethyl Methyl ◽  
Novel Structure ◽  
Three Component Reaction ◽  
High Yields

: Silica-POCl2 was used as the promoter for the three-component reaction of ethyl/methyl 3-phenyl glycidate, aniline derivatives, and dimethylcarbonate, leads to the synthesis of methyl/ethyl 2-oxo-4-phenyl-3-aryloxazolidine-5-carboxylate derivatives. The desired product was obtained in high yields.

Cyclic phosphines and arsines. II. Cyclic arsines

1970 ◽  
Vol 23 (8) ◽  
pp. 1559 ◽  
Author(s):  
PS Elmes ◽  
S Middleton ◽  
BO West
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Electron Impact ◽  
Systematic Study ◽  
Variable Temperature ◽  
Mass Spectrometric ◽  
Ionization Potentials ◽  
Methyl Ethyl ◽  
Mass Spectrometric Techniques ◽  
Nuclear Magnetic

The constitutions of the cyclopolyarsines (AsR)n (R = methyl, ethyl, n-propyl, and phenyl) have been investigated by nuclear magnetic resonance and mass spectrometric techniques. A systematic study of their fragmentation under electron impact at different ionization potentials has confirmed the presence of pentameric alkyl and hexameric phenyl cyclic arsines. Variable temperature N.M.R. spectra obtained for pentamethylcyclopentaarsine have been interpreted in terms of a rapid pseudorotation process. Some mixed methylphenyl cyclic arsines have been identified.

Electron-Impact Mass-Spectra of 3-Alkyl-2,1-benzisoxazoles

1991 ◽  
Vol 44 (6) ◽  
pp. 863 ◽  
Author(s):  
LK Dyall ◽  
JA Ferguson
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Methyl Ethyl ◽  
Molecular Ion ◽  
Partial Decomposition ◽  
Methyl Cyanide ◽  
Alkyl Groups ◽  
Alkyl Cations ◽  
Electron Impact Mass ◽  
Impact Mass

3-Alkyl-2,1-benzisoxazoles underwent complex fragmentations under electron impact, and the balance between available pathways changed considerably across the range of alkyl groups (methyl, ethyl, isopropyl and t-butyl). The primary loss of CO is accounted for in terms of rearrangement of the initial molecular ion to an alkylimine ketene species. The 3-methyl compounds lost methyl as methyl cyanide, acylium cation or ketene, but the higher alkyl groups were chiefly lost as alkyl cations or by internal fragmentations in which some novel ortho-effects were noted. Most of these pathways were confirmed by B/E linked scans, and useful comparisons were made with the e.i . spectra of N- alkylanthranilic acids. All of these isoxazoles underwent partial decomposition on the heated probe.

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