Etude par resonance magnétique multinucléaire d'intermédiaires réactionnels électrophiles. Partie 8. Action des acides de Lewis chlorés COCl2, POCl3, (CH3)2N=CHCl+Cl− et Cl2 sur l'hexaméthylphosphotriamide (HMPT)

1980 ◽  
Vol 58 (9) ◽  
pp. 946-952 ◽  
Author(s):  
S. Poignant ◽  
J. R. Gauvreau ◽  
G. J. Martin
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Study ◽  
Lewis Acids ◽  
Mechanism Of Formation ◽  
Substitution Product ◽  
Vilsmeier Reagent ◽  
Résonance Magnétique

The structural study of the electrophilic intermediates obtained from carboxamides and chlorinated Lewis acids is extended to the phosphoric amides. The action of COCl2 and POCl3 on hexamethylphosphotriamide (HMPT) can lead to a chlorophosphonium salt (3a) the structure of which is proved by nmr spectroscopy (1H, 13C, 31P, 15N). The mechanism of formation is comparable to that of the chloroiminium chloride (Vilsmeier reagent) from the corresponding amides. The action of chlorine on HMPT does not lead to a stable salt of the same kind but essentially to the substitution product (2). A new biphosphorylated compound (6) has been identified when an excess of chlorine is reacted with HMPT.

The mechanism of formation of 2,7-dimethyl-2,6-octadiene in the synthesis of 3-methylene-7-methyl-1,6-octadiene

1983 ◽  
Vol 48 (7) ◽  
pp. 1864-1866
Author(s):  
Jan Bartoň ◽  
Ivan Kmínek
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Alkali Metal ◽  
Chromatographic Analysis ◽  
Solid Phase ◽  
Reaction Pathway ◽  
Mechanism Of Formation ◽  
Gas Chromatographic Analysis ◽  
C Nmr ◽  
Visual Observations

2,7-Dimethyl-2,6-octadiene is formed in the catalytic solution for the dimerization of 2-methyl-1,3-butadiene to β-myrcene (3-methylene-7-methyl-1,6-octadiene), as revealed by mass spectrometry and 13C NMR spectroscopy. Visual observations together with the results of gas chromatographic analysis of the catalytic solution suggest that the formation of 2,7-dimethyl-2,6-octadiene is associated with the transition of the alkali metal (sodium) from the solid phase into the solution. A reaction pathway is suggested accounting for the formation of 2,7-dimethyl-2,6-octadiene in the system.

Reaction of 4-cyano-1,3-dihydroxy-5,6,7,8-tetrahydroisoquinolines with vilsmeier reagent: structure and mechanism of formation of [2,7]naphthyridines

Tetrahedron ◽  
1992 ◽  
Vol 48 (31) ◽  
pp. 6499-6510 ◽  
Author(s):  
Tirumalai R.Kasturi ◽  
Subramaniam Arumugam ◽  
Lata Mathew ◽  
Srirangam K. Jayaram ◽  
parthasarathi Dastidar ◽  
...  
Keyword(s):  
Mechanism Of Formation ◽  
Vilsmeier Reagent

Structural study of poly(vinyl alcohol) in the gel state by high-resolution solid-state 13C NMR spectroscopy

1995 ◽  
Vol 28 (19) ◽  
pp. 6677-6679 ◽  
Author(s):  
Masatoshi Kobayashi ◽  
Isao Ando ◽  
Takahiro Ishii ◽  
Shigetoshi Amiya
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
High Resolution ◽  
Structural Study ◽  
13C Nmr ◽  
Vinyl Alcohol ◽  
13C Nmr Spectroscopy ◽  
Poly Vinyl Alcohol ◽  
Solid State 13C Nmr

Structural study of BaO-MoO3-P2O5 glasses by Raman and NMR spectroscopy

2017 ◽  
Vol 476 ◽  
pp. 114-121 ◽  
Author(s):  
Ladislav Koudelka ◽  
Petr Kalenda ◽  
Jana Holubová ◽  
Petr Mošner ◽  
Lionel Montagne ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Study

N–H deprotonation of a diaminodialkoxido diborane(4) – a structural study on bifunctional Lewis acids/bases and their dimerisation to B(sp2)2B(sp3)2N2 six membered rings

2021 ◽  
Vol 50 (37) ◽  
pp. 13149-13157
Author(s):  
Wiebke Drescher ◽  
Christian Kleeberg
Keyword(s):  
Structural Study ◽  
Lewis Acids

The N–H deprotonation of the diaminodialkoxido diborane(4) pinB–Bdab (1) (pin: (OCMe2)2, dab: 1,2-(NH)2C6H4), is crucial for the electrophilic N-functionalisation towards unsymmetrical diborane(4) reagents.

Structural study of four Ca@C82 isomers by 13C NMR spectroscopy

2003 ◽  
Vol 377 (1-2) ◽  
pp. 197-200 ◽  
Author(s):  
Takeshi Kodama ◽  
Ryosuke Fujii ◽  
Yoko Miyake ◽  
Koichi Sakaguchi ◽  
Hiroyuki Nishikawa ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Study ◽  
13C Nmr ◽  
13C Nmr Spectroscopy

A structural study of silicon-based interpenetrating polymer networks by solid state 1H and 13C NMR spectroscopy

2002 ◽  
Vol 602-603 ◽  
pp. 321-333 ◽  
Author(s):  
Masatoshi Kobayashi ◽  
Shigeki Kuroki ◽  
Isao Ando ◽  
Kazuo Yamauchi ◽  
Hideaki Kimura ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Structural Study ◽  
13C Nmr ◽  
Polymer Networks ◽  
13C Nmr Spectroscopy ◽  
Interpenetrating Polymer Networks ◽  
1H And 13C Nmr ◽  
Silicon Based
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