scholarly journals Polycentric binding in complexes of trimethylamine-N-oxide with dihalogens

RSC Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 6131-6145
Author(s):  
Olga M. Zarechnaya ◽  
Aleksei A. Anisimov ◽  
Eugenii Yu Belov ◽  
Nikolai I. Burakov ◽  
Alexander L. Kanibolotsky ◽  
...  
Keyword(s):  
Ambient Conditions ◽  
Iodine Chloride ◽  
Monodentate Ligands ◽  
Iodine Bromide

Dihalogens readily interact with trimethylamine-N-oxide under ambient conditions. Stable 1 : 1 adducts were obtained in a case of iodine chloride and iodine bromide. Formally monodentate ligands are bound in a polycentric manner.

Electrophilic ipso-Halocyclization of N-Phenyl-N-triflylpropiolamides Leading to 8-Halo-1-azaspiro[4.5]deca-3,6,9-trien-2-ones

Synthesis ◽  
2020 ◽  
Vol 52 (10) ◽  
pp. 1489-1497
Author(s):  
Gerhard Maas ◽  
Vito A. Fiore ◽  
Michael Keim ◽  
Roland Werz
Keyword(s):  
Amide Bond ◽  
Secondary Amines ◽  
Primary Amines ◽  
Iodine Chloride ◽  
Iodine Bromide

N-Phenyl-N-triflylpropiolamides react with iodine chloride or iodine bromide by an intramolecular electrophilic ipso-halocyclization/nucleophilic halide addition sequence to furnish cyclohexadiene-spiro-γ-lactams. These products can undergo cleavage of the amide bond with primary amines and of the N–Cspiro bond with secondary amines, leading to N-alkyl-2-iodo-3-phenylacrylamides and N-(4-halophenyl)-2-iodo-3-(2-triflylamino)phenylacrylamides, respectively.

The Unsaturation of Butadiene Rubbers. I

1949 ◽  
Vol 22 (2) ◽  
pp. 287-298
Author(s):  
A. A. Vasil'ev
Keyword(s):  
Intramolecular Cyclization ◽  
Degree Of Saturation ◽  
Double Bonds ◽  
Iodine Chloride ◽  
Iodine Bromide

Abstract 1. The data on the unsaturation of butadiene rubbers previously obtained by using the method based on the reaction with iodine bromide have been checked and confirmed with the aid of the reactions with pyridine sulfate dibromide and with iodine chloride. 2. The influence of various factors on the unsaturation of butadiene rubbers has been checked, and the possibility of estimating changes in unsaturation with the aid of the reaction with iodine bromide has been established. 3. The present investigation shows that, during the reaction between butadiene rubbers and halogens, it is impossible to attain a degree of saturation exceeding 85–90 per cent of the theoretical values. This is apparently due to the existence of intramolecular cyclization, to the presence of intermolecular connecting bridges, and possibly to the presence of double bonds resistant to halogenation or of conjugated double bonds in the molecules of these rubbers. The reaction with halogens offers no possibility of confirming these suppositions experimentally.

Hydrogen bonding in liquid methanol at ambient conditions and at high pressure

2000 ◽  
Vol 98 (3) ◽  
pp. 125-134 ◽  
Author(s):  
T. Weitkamp, J. Neuefeind, H. E. Fisch
Keyword(s):  
High Pressure ◽  
Hydrogen Bonding ◽  
Ambient Conditions
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