Synthesis Of Diamines Research Articles

Heterogeneous bimetallic Pt–Sn/γ-Al2O3 catalyzed direct synthesis of diamines from N-alkylation of amines with diols through a borrowing hydrogen strategy

Direct synthesis of diamines has been efficiently realized from the N-alkylation of amines with diols by means of heterogeneous bimetallic Pt–Sn/γ-Al2O3 catalyst (0.5wt% Pt, molar ratio Pt:Sn=1:3) through a ‘Borrowing Hydrogen’ strategy under ligand-free conditions. The present methodology provides an environmentally benign route to diamines.

Improved Ruthenium‐Catalyzed Amination of Alcohols with Ammonia: Synthesis of Diamines and Amino Esters

Improved Ruthenium‐Catalyzed Amination of Alcohols with Ammonia: Synthesis of Diamines and Amino Esters

Improved Ruthenium‐Catalyzed Amination of Alcohols with Ammonia: Synthesis of Diamines and Amino Esters

Aus O wird N: Die erste homogen katalysierte Diaminierung primärer und sekundärer Diole mit Ammoniak liefert die entsprechenden Diamine. Auch primäre und sekundäre Alkohole einschließlich hydroxysubstituierter Ester werden effizient in primäre Amine überführt. Dieses atomeffiziente und selektive Aminierungsverfahren läuft in einer Ammoniakatmosphäre ohne zusätzliche Wasserstoffquellen ab.

Template synthesis and characterization of diaza dioxa macrocyclic nanosized cobalt(II) complex dispersed within nanocavity of zeolite-Y

Nanocavity microreactor containing 15- and 16-membered diaza dioxa Schiff-base cobalt(II) complexes “[Co(Et[15]N 2O 2)] 2+, [Co(Pr[16]N 2O 2)] 2+, [Co(Ph[15]N 2O 2)] 2+ and [Co(Ch[15]N 2O 2)] 2+” have been prepared by the template synthesis of diamine (1,2-diaminoethane, 1,3-diaminopropane, 1,2-diaminobenzene or 1,2-diaminocyclohexane) with [(1,3-bis(2-carboxyaldehydephenoxy)propane)cobalt] 2+;[Co(BCAPP)] 2+@NaY within the pores of zeolite-Y. The nanosized cobalt(II) complex were entrapped in the supercage of Y-zeolite by a three-step process in the liquid phase: (i) exchange of Co(II) ions with NaY in water solution, (ii) reaction of Co(II)–NaY with excess BCAPP in methanol; [Co(BCAPP)] 2+@NaY; (iii) template synthesis of [Co(BCAPP)] 2+@NaY with diamine. The new nanosized complex entrapped in the nanocavity of zeolite Y was characterized by several techniques: chemical analysis and spectroscopic methods (FT-IR, UV–Vis, XRD, BET, DRS, XPS, TGA).

Inexpensive synthesis of 1,4-bis(4-aminophenoxy)-2- (6-oxido-6H-dibenz oxaphosphorin-6-yl) phenylene and its oxygen-plasma resistant polyamides

Inexpensive synthesis of diamine, 1,4-bis(4-nitrophenoxy)-2-(6-oxido-6H-dibenz <c,e> <1,2> oxaphosphorin-6-yl) phenylene was revealed in this work. Based on the diamine, a series of organosoluble polyamides were prepared by direct polycondensation of the diamine with various aromatic diacids using triphenyl phosphite and pyridine as condensing agents. The number–average molecular weights of the resulting polyamides range from 4.2 × 10 4 to 10.5 × 10 4 g/mol, and the weight–average molecular weights are in the range of 7.5–28.2 × 10 4 g/mol. The T gs of these polyamides range from 210 to 255 °C by dynamic mechanical analysis. The resulting polyamides are tough and flexible with tensile strength, elongation at break and moduli range from 84 to 101 MPa, 4.8–7.0%, and 2.36–3.22 GPa, respectively. The degradation temperatures ( T d 5%) and char yields at 800 °C in nitrogen range from 460 to 486 °C and 59–68 wt%, respectively. The cutoff wavelength of these polyamides falls in the range of 345–366 nm, showing a very light color characteristic. In addition, these polyamides display good oxygen plasma resistance.

Synthesis of diamine functionalized mesoporous organosilicas with large pores

Hybrid mesoporous silicas functionalized with ethylenediamine groups have been synthesized via sol–gel process under different conditions. The best textural properties, with pore diameters up to 170 A, have been obtained using carboxylic acids as catalysts in propanol as solvent without the need for any surfactant. The presence of the diamine moiety has been demonstrated by different characterization techniques, and the materials have been used in the adsorption of copper cations. The adsorption capacity of all the solids is high (up to 1.87 mmol/g and up to 2.47 Cu atoms/nm2), with important variations in the properties of the silica surface, besides the role of the immobilized diamine moieties as ligand for copper. In general the surface area seems to be the most important feature controlling the adsorption.

Solid-Phase synthesis of diamine and polyamine amino acid derivatives as HIV-1 tat-TAR binding inhibitors

A series of diamine and polyamine derivatives, either free amines or salts (HCl or TFA), of aspartic and glutamic acid were prepared in excellent yields using Rink Amide solid-phase synthesis. The asparagine and glutamine derivatives were all evaluated for their ability to inhibit Tat-TAR binding using a FIGS cellular assay, with the polyamine derivatives exhibiting the most promising binding activity.

Chemoselective Synthesis of Diamines with Cationically Polymerizable Groups and Polyimides Synthesis

Abstract Functional diamines with cationically polymerizable groups were successfully prepared in one-step by the chemoselective reaction of 4,4′-diamino-3,3′-dicarboxydiphenylmethane (1) using 1,8-diazabicyclo-[5.4.0]-7-undecene (DBU). The reaction of 1 with propargyl bromide (2a), 2-chloroethyl vinyl ether (2b), and 2-bromomethyl-1,4,6-trioxa-spiro[4.4]nonane (2c) using DBU proceeded chemoselectively under mild conditions without any protection of the amino group to produce the corresponding diamines (3a-3c) in high yields.

Factors influencing the reverse-Cope approach to 1,2,5-oxadiazinanes from allylamines and nitrones: Optimization of a new vicinal diamine synthesis

Nitrones generated from formaldehyde and N-alkyl-hydroxylamines are particularly suitable reactants in tandem reverse-Cope∼Meisenheimer reactions leading to oxadiazinanes and thence N-hydroxydiamines and vicinal diamines, from allylamines.

ChemInform Abstract: Synthesis of Diamines with Perfluorinated Alkyl Chains.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Stereocontrolled synthesis of diamines from iodolactams

Displacement of iodide from iodolactams by azide occurs with retention of configuration if a catalytic amount of NaH is added, due to the intervention of an N-acyl-aziridine. Several diamine equivalents and a spermidine analogue are prepared in this way.

Synthesis of diamines and diamino ethers

1. A method was developed for the synthesis of 1,4-N,N-bis(alkylamino)butanes and 1,4-diazacyclooctanes by the hydrogenation of the corresponding 1,4-N,N-bis(alkylamino)-1,3-butadienes and 1,4-diaza-5,7-cyclooctadienes. The latter were obtained from diacetylene, alkylamines, and alkylenediamines. 2. The hydrogenation of the 1,4-N,N-bis(alkylamino)-1,3-butadienes and 1,4-diaza-5,7-cyclooctadienes is accompanied by hydrogenolysis of the C-N bond. Cleavage of the C-O bonds occurs during the hydrogenation of the di(β-cyanoethyl) ethers of glycols. 3. The method for obtaining the di(γ-aminopropyl) ethers of glycols by the hydrogenation of the corresponding dinitriles was modified. The reaction was run in the absence of ammonia at an initialhydrogen pressure of 160–180 atm.

Epoxy Ethers. XX.1 Synthesis of Diamines, Morpholines, and Piperazines

Epoxy Ethers. XX.¹ Synthesis of Diamines, Morpholines, and Piperazines