Search results for "Amide"

showing 10 items of 3119 documents

Über umsetzungen an poly-p-lithiumstyrol. 4. Mitt. Darstellung carbonylgruppenhaltiger derivate des polystyrols

1961

In Fortsetzung fruherer Arbeiten wird die Reaktivitat von Poly-p-lithiumstyrol gegenuber solchen Agenzien gepruft, die zur Bildung von carbonylgruppenhaltigen Verbindungen fuhren. Wahrend bei der Umsetzung mit Orthoameisensaureester nur vernetzte Polymere entstechen, last sich mit Dimethylformamid ein losliches Derivat des Polystyrols herstellen das p-standige Formylgruppen tragt. Die Reaktion mit Nitrilen liefert polymere Ketone; mit Acetophenon entsteht Poly-p-vinylacetophenon, das mit dem aus dem Monomeren durch Polymerisation erhaltenen Produkt verglichen wird. Mit Benzonitril erhalt man Poly-p-vinylbenzophenon. Die polymeren Ketone konnen in die Oxime ubergefuhrt werden, deren Sticksto…

chemistry.chemical_classificationchemistry.chemical_compoundBenzonitrileMonomerKetonechemistryPolymer chemistryBenzophenoneDimethylformamideReactivity (chemistry)OximeAcetophenoneDie Makromolekulare Chemie
researchProduct

Synthesis and properties of polymers with unusual structure

1985

This lecture summarize some recent results of our current research. The first part describes the homopolymerization and copolymerization of a monocyclic and two bicyclic unsaturated acetals. In this way polyacetals with 1,4-cis-butadiene units and cyclohexene units respectively are obtained. Secondly, the N-substitution of polyamides is described. By N-metalation and subsequent alkylation comb-like polyamides are available. Longer branches cause a side-chain crystallinity. The anionic “grafting-from” technique forms irregular branched polyamides. By termination reaction between living ends of poly(2-isopropenylnaphthalene) and suitable electrophiles new macromonomers are available. The last…

chemistry.chemical_classificationchemistry.chemical_compoundCrystallinitychemistryBicyclic moleculeElectrophilePolymer chemistryPolyamideCyclohexeneCopolymerOrganic chemistryPolymerAlkylationDie Makromolekulare Chemie
researchProduct

N-{(Z)-2-[1-(Triisopropylsilyl)-1H-indol-3-yl]-2-(triisopropylsilyloxy)vinyl}-2-(3,4,5-trimethoxyphenyl)acetamide

2007

The molecular structure of the title compound, C39H62N2O5Si2, obtained as an unexpected side product, was determined in the course of our studies on the synthesis of N-triisopropyl-1H-indol-3-yl derivatives. Interestingly, although the triisopropylsilyl group was intended as a temporary protecting group, the compound comprises a remarkably stable N—Si bond. The vinyl C=C double bond possesses a Z configuration.

chemistry.chemical_classificationchemistry.chemical_compoundDouble bondchemistrySilylationSide productGeneral Materials ScienceGeneral ChemistryCondensed Matter PhysicsProtecting groupMedicinal chemistryAcetamideActa Crystallographica Section E Structure Reports Online
researchProduct

Untersuchungen über die radikalpolymerisation von acrylamid

1954

Verschiedene Methoden zur Radikal-Polymerisation von Acrylamid mit und ohne Losungsmittel werden beschrieben. Die durch γ-Strahlen ausgeloste Polymerisation ergibt sehr hochmolekulare Polymerisate; dagegen haben die mittels Fenton-Reagens erhaltenen Produkte nur sehr geringe spezifische Viskositat. Ultraschall wirkt auf das Monomere polymerisierend und auf das Polymere depolymerisierend. Aus den Viskositatskurven eines reinen Polymerisates und seiner Fraktionen ist zu schliesen, das solche Polyacrylamide in wasriger Losung als homoopolare Molekulkolloide vorliegen. Different methods of radical-polymerization of acrylamide in solution and in bulk are described. The γ-rays induced polymerizat…

chemistry.chemical_classificationchemistry.chemical_compoundMonomerAqueous solutionchemistryPolymerizationReagentIntrinsic viscosityAcrylamidePolyacrylamidePolymer chemistryPolymerDie Makromolekulare Chemie
researchProduct

Über die polymerisation von acrylsäurechlorid

1960

Monomeres Acrylsaurechlorid wird mittels Azodiisobuttersaurenitril in Dioxan bei 50°C polymerisiert. Bei Ausschlus von Feuchtigkeit und Sauerstoff entstehen bis zu 90% Umsatz unvernetzte Polymere. Durch Reaktion mit flussigem Ammoniak wurden Polyacrylamide erhalten, die zur viskosimetrischen Molgewichtsbestimmung dienten. Monomeric acrylyl chloride was polymerized in dioxane at 50°C by azo-bis-isobutyronitrile. With the exclusion of moisture and oxygen, a non-cross-linked polymer with a 90% yield was obtained. Polyacrylamides were formed by the reaction of polyacrylyl chloride with liquid ammonia. These products were used for viscosimetric molecular weight determinations.

chemistry.chemical_classificationchemistry.chemical_compoundMonomerchemistryPolymerizationYield (chemistry)PolyacrylamideLiquid ammoniaPolymer chemistrymedicinePolymerChloridemedicine.drugDie Makromolekulare Chemie
researchProduct

Mechanismus und Reaktionswege der Xanthenylierung an ambidenten nukleophilen Arzneistoffen

1986

Am Beispiel der ambidenten nukleophilen Arzneistoffe 4-Aminobenzolsulfonamid (3), Indometacin (7) und Phenylbutazon (10) werden Aralkylierungen mit dem SN1-aktiven Reagens Xanthydrol (1) vorgestellt. Mechanism and Reaction Path of the Xanthenylation of Ambident Nucleophilic Drugs The aralkylation of ambident nucleophilic drugs, e.g. 4-aminobenzenesulfonamide (3), indometacine (7) and phenylbutazone (10), with SN1-active xanthydrol (1) is described.

chemistry.chemical_classificationchemistry.chemical_compoundSN1 reactionNucleophileBicyclic moleculechemistryStereochemistryDrug DiscoveryPharmaceutical ScienceReaction pathXanthydrolSulfonamideArchiv der Pharmazie
researchProduct

A new access to 2′-amino-substituted vinylindoles as donor-activated heterocyclic dienes and their first diels-alder reactions

1992

Abstract Reactions of the 3-acylindoles 5, 10 , and 15 with α-amino-α′-diphenylphosphinoyl-substituted carbanions gave rise to the 2′-amino-substituted 3− and 2-vinylindoles 7, 12 , and 17 by way of the isolable carbinols 6 , 11 , and 16 . The heterocyclic dienes 7 , 12 , and 17 readily underwent Diels-Alder reactions with N -phenylmaleimide.

chemistry.chemical_classificationchemistry.chemical_compoundTertiary amineBicyclic moleculeChemistryOrganic ChemistryDrug DiscoveryDiels alderOrganic chemistryImideBiochemistryCarbanionSulfonamideTetrahedron
researchProduct

1983

To obtain a carrier polymer for pharmacologically active components, linear polyethyleneimine (LPEI) was chemically modified by reactions with acrylic acid (1a), acrylamide (1b), acrylic acid esters (1c and 1d), sodium chloroacetate, and hydrochloric acid. All product polymers 2a – 2e are soluble in water. Among these, 2a and 2e, β- and α-amino acid derivatives, respectively, show no acute toxicity in mice up to dosages of 1 g/kg i. v. Similar types of polymers 5a and 5b and a polymer containing phosphonic acid moieties (5d) derived from branched polyethyleneimine (BPEI) were prepared. 5a and 5b are also nontoxic regardless of the molecular weight of four kinds of BPEI and of the wide range…

chemistry.chemical_classificationchemistry.chemical_compoundchemistryAcrylamideZwitterionPolymer chemistryOrganic chemistryHydrochloric acidPolymerSodium chloroacetateAcute toxicityAmino acidAcrylic acidDie Makromolekulare Chemie
researchProduct

ARYL-VINYLSULFONE—REAGENTIEN ZUM SCHUTZ UND NACHWEIS VON THIOLFUNKTIONEN

1983

Abstract Aryl vinyl sulfones selectively react with thiol groups to acid-stable compounds which easily are cleaved by mild bases to thiol compounds. Ester and amide groups are not attacked under these conditions. Therefore, these compounds are good protecting groups or labels in peptide chemistry. The following aryl vinyl sulfones were investigated: phenyl vinyl sulfone 1, p-carbethoxyphenyl vinyl sulfone 15 and the fluorescent 5-dimethylaminonaphthyl 1-vinyl sulfone 5 and 5-methoxynaphthyl-1 vinyl sulfone 10. The last two compounds are very useful reagents for the quantitative determination of SH-groups in polypeptides such as enzymes. Aryl-vinylsulfone reagieren selektiv mit Thiolgruppen …

chemistry.chemical_classificationchemistry.chemical_compoundchemistryArylReagentAmidePolymer chemistrytechnology industry and agricultureThiolPeptide chemistryPhenyl vinyl sulfoneQuantitative determinationSulfonePhosphorus and Sulfur and the Related Elements
researchProduct

Über makrozwitterionen, 9. Über den mechanismus der anionischen polymerisation von acrylnitril mit tertiären phosphinen unter Zusatz von LiCl

1974

Die anionische Polymerisation von Acrylnitril mit tertiaren Phosphinen in Dimethylformamid bei 25°C wurde unter Zusatz von LiCl untersucht. Es zeigte sich, das durch den Salzzusatz mit Triphenylphosphin als Initiator eine Polymerisation uber Makrozwitterionen ermoglicht wird und mit Triathylphosphin die (auch ohne Salzzusatz schon mogliche) Makrozwitterionenbildung starker auftritt. The effect of LiCl on the polymerization of acrylonitrile initiated by tertiary phosphines at 25 C in dimethylformamide was studied. Macrozwitterions are formed only in the presence of the added salt when triphenylphosphine is used as an initiator. In the system initiated by triethylphosphine formation of macroz…

chemistry.chemical_classificationchemistry.chemical_compoundchemistryPolymerizationPolymer chemistryDimethylformamideSalt (chemistry)AcrylonitrileTriphenylphosphineDie Makromolekulare Chemie
researchProduct