The mass spectra of the arylsulphonyl derivatives of methyl acetates

1974 ◽  
Vol 27 (11) ◽  
pp. 2361 ◽  
Author(s):  
I Pratanata ◽  
LR Williams
Keyword(s):  
Sulphur Dioxide ◽  
Mass Spectra ◽  
Bond Formation ◽  
Ortho Position ◽  
Aryl Substituent ◽  
Skeletal Rearrangement ◽  
Derivatives Of ◽  
Oxygen Bond

The spectra of arylsulphonyl derivatives of methyl acetates revealed a variety of skeletal rearrangement ions. The influence of the aryl substituent on simple fragmentation, rearrangement by carbon-oxygen bond formation, elimination of ketene after alkoxy migration to the ortho position of the ring and skeletal rearrangement by means of elimination of sulphur dioxide is discussed.

Carbon-oxygen bond formation in the mass spectra of aryl methyl sulphones

1974 ◽  
Vol 8 (1) ◽  
pp. 175-178 ◽  
Author(s):  
Miss I. Pratanata ◽  
L. R. Williams ◽  
R. N. Williams
Keyword(s):  
Mass Spectra ◽  
Bond Formation ◽  
Oxygen Bond ◽  
Aryl Methyl

Hydroxamic acids. III. Mass spectra of substituted hydroxamic acids and cyclic imides

1969 ◽  
Vol 22 (1) ◽  
pp. 175 ◽  
Author(s):  
JH Bowie ◽  
MTW Hearn ◽  
AD Ward
Keyword(s):  
Electron Impact ◽  
Hydroxamic Acid ◽  
Mass Spectra ◽  
Hydroxamic Acids ◽  
Skeletal Rearrangement ◽  
Cyclic Imides ◽  
Derivatives Of ◽  
Hydroxamic Acid Derivatives

Aryl hydroxamic acid derivatives fragment in a diagnostic manner upon electron impact. A hydroxamic acid containing both styryl and benzyl substituents undergoes skeletal-rearrangement of the type ABC → AC+B. The mass spectra of the O- and N-acetyl derivatives of O- benzylhydroxamic acids are indistinguishable. M-CO2 fragments are again observed in the mass spectra of several substituted phthalimides.

Some skeletal-rearrangement processes of phosphoranes upon electron impact

1970 ◽  
Vol 23 (2) ◽  
pp. 307 ◽  
Author(s):  
AP Gara ◽  
RA Massy-Westropp ◽  
JH Bowie
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Bond Formation ◽  
Skeletal Rearrangement ◽  
Deuterium Labelling ◽  
Rearrangement Processes

The mass spectra of acyl phosphoranes exhibit peaks which arise by P-O bond formation. The problem of thermal against electron impact rearrangement is considered and the rearrangements have been studied by deuterium labelling. The formation of the fluorenyl cation (m/e 165) has also been investigated.

Alkyl-oxygen bond formation in the mass spectra of α-chloromethyl aryl sulphones

1974 ◽  
Vol 9 (4) ◽  
pp. 418-421 ◽  
Author(s):  
Miss Itawati Pratanata ◽  
L. R. Williams ◽  
R. N. Williams
Keyword(s):  
Mass Spectra ◽  
Bond Formation ◽  
Oxygen Bond

Formation of Carbon-Oxygen Bond Mediated by Hypervalent Iodine Reagents Under Metal-free Conditions

2020 ◽  
Vol 17 ◽  
Author(s):  
Ayesha Jalil ◽  
Yaxin O Yang ◽  
Zhendong Chen ◽  
Rongxuan Jia ◽  
Tianhao Bi ◽  
...  
Keyword(s):  
Natural Products ◽  
Bond Formation ◽  
Building Blocks ◽  
Review Article ◽  
Hypervalent Iodine ◽  
Metal Free ◽  
Bioactive Natural Products ◽  
The Past ◽  
Oxygen Bond ◽  
Privileged Scaffolds

: Hypervalent iodine reagents are a class of non-metallic oxidants have been widely used in the construction of several sorts of bond formations. This surging interest in hypervalent iodine reagents is essentially due to their very useful oxidizing properties, combined with their benign environmental character and commercial availability from the past few decades ago. Furthermore, these hypervalent iodine reagents have been used in the construction of many significant building blocks and privileged scaffolds of bioactive natural products. The purpose of writing this review article is to explore all the transformations in which carbon-oxygen bond formation occurred by using hypervalent iodine reagents under metal-free conditions

Inductive effect in EI-mass spectra of some 5,6-dihalogenides and 5,6-halohydrins of 5α-cholestan-3β-ol and 3β-acetoxy-5α-cholestane

1982 ◽  
Vol 47 (11) ◽  
pp. 2946-2960 ◽  
Author(s):  
Antonín Trka ◽  
Alexander Kasal
Keyword(s):  
Mass Spectra ◽  
Inductive Effect ◽  
Molecular Ions ◽  
Hydroxyl Group ◽  
Halogen Atoms ◽  
Derivatives Of

Partial EI-mass spectra of 3β-hydroxy- and 3β-acetoxy-5α-cholestanes substituted in positions 5α-, 6β- or 5α,6β- with a hydroxyl group or halogen atoms (fluorine, chlorine, bromine) are presented. The molecular ions of 5α,6β-disubstituted derivatives of 3β-hydroxy-5α-cholestane (or of its 3-acetate) are considerably more stable than the corresponding monosubstituted derivatives if at least one of the pair of the vicinal substituents is chlorine or fluorine. This increase in stability, most striking in 5α- and 6β-fluoro compounds, is explained by the inductive effect.

ChemInform Abstract: New Access to H-Phosphonates via Metal-Catalyzed Phosphorus—Oxygen Bond Formation.

ChemInform ◽  
2008 ◽  
Vol 39 (1) ◽  
Author(s):  
Laetitia Coudray ◽  
Isabelle Abrunhosa-Thomas ◽  
Jean-Luc Montchamp
Keyword(s):  
Bond Formation ◽  
Metal Catalyzed ◽  
Oxygen Bond
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