Oxidative addition of methyl iodide to monosubstituted and disubstituted derivatives of osmium pentacarbonyl

1993 ◽  
Vol 32 (5) ◽  
pp. 547-553 ◽  
Author(s):  
Gianfranco Bellachioma ◽  
Giuseppe Cardaci ◽  
Alceo Macchioni ◽  
Pierfrancesco Zanazzi
Keyword(s):  
Methyl Iodide ◽  
Oxidative Addition ◽  
Derivatives Of

scholarly journals Hyperbranched Poly(ether-siloxane)s Containing Ammonium Groups: Synthesis, Characterization and Catalytic Activity

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 856
Author(s):  
Paweł G. Parzuchowski ◽  
Aleksandra Świderska ◽  
Marlena Roguszewska ◽  
Karolina Rolińska ◽  
Dominik Wołosz ◽  
...  
Keyword(s):  
Methyl Iodide ◽  
Raw Materials ◽  
Ethylene Carbonate ◽  
Step Procedure ◽  
Hyperbranched Poly ◽  
Epoxy Monomer ◽  
Nmr Techniques ◽  
Anionic Ring ◽  
Amine Groups ◽  
Derivatives Of

In this article we report an easy synthetic route towards hyperbranched polyglycerols (Amm-HBPGs) containing trimethylammonium groups and siloxane or hydroxyl end-groups. Siloxane derivatives of Amm-HBPGs were synthesized in an efficient five-step procedure including an anionic ring opening copolymerization of the phthalimide-epoxy monomer with glycidol, followed by reactions with allyl bromide, hydrosililation with hydrogenheptamethyltrisiloxane, hydrazinolysis of phthalimide groups and quaternization of resulting amine groups with methyl iodide. Hydroxyl derivatives were obtained by quaternization of previously reported aminated HBPG’s with methyl iodide. Polymeric products were characterized using various NMR techniques, FTIR, and elemental analysis. Both Amm-HBPGs were shown to be effective in catalysis of addition of CO2 to oxirane. The hydrophilic catalysts showed higher efficiency but synthesis of ethylene carbonate was accompanied by formation of small amounts of ethylene glycol. The siloxane-containing catalyst was easily separable from reaction mixture showing high potential in the process of converting carbon dioxide into valuable chemical raw materials.

Oxidative addition capability of triphosphine iron and ruthenium complexes with methyl iodide

2004 ◽  
Vol 689 (4) ◽  
pp. 801-810 ◽  
Author(s):  
Piotr Jaunky ◽  
Helmut W. Schmalle ◽  
Montserrat Alfonso ◽  
Thomas Fox ◽  
Heinz Berke
Keyword(s):  
Methyl Iodide ◽  
Ruthenium Complexes ◽  
Oxidative Addition

N-Methylamino Acids in Peptide Synthesis. II. A New Synthesis of N-Benzyloxycarbonyl, N-Methylamino Acids

1973 ◽  
Vol 51 (12) ◽  
pp. 1915-1919 ◽  
Author(s):  
John R. McDermott ◽  
N. Leo Benoiton
Keyword(s):  
Amino Acids ◽  
Methyl Iodide ◽  
Peptide Synthesis ◽  
Side Chains ◽  
Butyl Group ◽  
New Synthesis ◽  
Derivatives Of

Reaction of N-benzyloxycarbonyl derivatives of aliphatic amino acids, and threonine, aspartic, and glutamic acids whose side-chains were protected with the t-butyl group, gave the corresponding N-methylamino acid derivatives in good yields. The methionine derivative could be obtained by using only one mol of methyl iodide. Derivatives of threonine, and aspartic and glutamic acids whose side-chains were not protected could not be methylated. Analysis of the crude products of methylation in three cases showed that they contained 0–1% of racemized material.

Sign in / Sign up

Export Citation Format

Share Document