Selective Synthesis of Secondary and Tertiary Amines by Cp*Iridium-Catalyzed Multialkylation of Ammonium Salts with Alcohols

2008 ◽  
Vol 10 (2) ◽  
pp. 181-184 ◽  
Author(s):  
Ryohei Yamaguchi ◽  
Shoko Kawagoe ◽  
Chiho Asai ◽  
Ken-ichi Fujita
Keyword(s):  
Ammonium Salts ◽  
Selective Synthesis ◽  
Tertiary Amines

Thermal stability of ammonium salts as compatibilizers in polymer/layered silicate nanocomposites

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Maurizio Galimberti ◽  
Marco Martino ◽  
Monica Guenzi ◽  
Gabriella Leonardi ◽  
Attilio Citterio
Keyword(s):  
Thermal Stability ◽  
Layered Silicate ◽  
Ammonium Cation ◽  
Ammonium Salts ◽  
Chloride Salt ◽  
Tertiary Amines ◽  
Silicate Nanocomposites ◽  
Thermal Stability Of ◽  
Isoprene Rubber

AbstractThermal stability of alkyl and arylalkyl quaternary ammonium cation (onium) in starting chloride salt, in organoclay obtained after exchange with montmorillonite (MMT) and after mixing of the organoclay with isoprene rubber was examined using conventional TGA and by mass spectrometry pyrolysis/GC-MS. Degradation was observed to occur at T ≥ 170 °C for organoclays and the main volatile compounds were identified as tertiary amines, chloroalkanes and alkenes. Mechanisms for their formation are proposed and the role of residual onium chloride and basic centers of layered silicate is discussed.

Room Temperature Phase-Selective Synthesis of Metastable Lead Chromium Oxides

1997 ◽  
Vol 495 ◽  
Author(s):  
Kenneth M. Doxsee ◽  
Meehae Jang
Keyword(s):  
Lead Oxide ◽  
Room Temperature ◽  
Potassium Chromate ◽  
Temperature Phase ◽  
Selective Synthesis ◽  
Tertiary Amines ◽  
Metathesis Reaction ◽  
Soluble Complex ◽  
Monoclinic Modification ◽  
Rich Phase

ABSTRACTThe salt metathesis reaction between lead(II) salts and potassium chromate in methanolic solution, mediated by the formation of a soluble complex of potassium chromate with a cyclic polyether, affords orthorhombic PbCrO4 rather than the monoclinic modification formed in aqueous solution. When the aqueous metathesis reaction is carried out in the presence of tertiary amines, a lead oxide-rich phase, PbO•PbCrO4 (Pb2CrO5), is selectively formed.

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