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Showing 1 to 20 of 158 for “"Imine"”.
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Liquid Crystalline Copper(II) Complexes of Poly(propylene imine) Dendrimers
… poly(propylene imine) PPI dendrimers from 1st to 5th generation as ligands and copper(II) as paramagnetic centres have been synthesised. The dendrimeric complexes were prepared by coordination of copper(II) to the corresponding ligands. The maximum loadings …
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Darstellung unnatürlicher Alpha-Aminosäurederivate durch Additionsreaktionen an acyclische und cyclische Imine
… die CN-Doppelbindung acyclischer und cyclischer Imine wird beschrieben. Die Verwendung von substituierten 3,4,5,6-Tetrahydropyridinen als cyclische Iminokomponenten führt zu substituierten Pipecolinsäurederivaten, die durch zwei unterschiedliche Synthesestrategien dargestellt werden können, der …
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Folding-Driven Synthesis of Dynamic Covalent Oligomers Joined by Imine Linkages
The incorporation of folding features into the imine oligomers increases the kinetic stability under hydrolysis conditions by burying the labile imine bond. The imine bond in the imine dodecamer shows an order of magnitude longer half-life compared with the imine tetramer. The folding process could …
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Electrochemical impedance modelling of the reactivities of dendrimeric poly(propylene imine) DNA nanobiosensors
… studies of three dendrimeric polypropylene imine (PPI) nanomaterials and their applications as a platform in the development of a novel label free DNA nanobiosensor based on electrochemical impedance spectroscopy. Cyclic voltammetry (CV), differentia pulse voltammetry (DPV), square wave …
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NATURAL PRODUCT INSPIRED METHODOLOGIES: ADVANCES IN DIASTEREOSELECTIVE N-SULFINYL IMINE AND TRIFLUOROPYRUVIC ACID REACTIONS
… worked well with a diverse set of N-sulfinyl aldimines and ketimines with 50-99% yield and 3:1 to 98:2 diastereoselectivity. A one-pot protocol was developed to access 1,2 amino alcohols with high diastereoselectivity. With a good understanding of the diastereoselective reaction with NSMD and …
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Hemilabile Phosphorus Enamine/Imine Ligands And Their Application In Ru-Catalyzed Aqueous Hydration Of Nitriles
The insertion of aromatic nitriles into the C-Li bond of PTA-Li gave a new series of P,N k2-enaminophosphine derivatives (PTA=C(R)NH2) of 1,3,5-triaza-7-phosphaadamantane (PTA), with a characteristic double bond on the PTA cage. Oxidation or sulfuration of the ligands resulted in a mixture of …
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Synthesis, Characterisation and Transition Metal Ion Complexation Studies of “Pocket-Like” Imine and Amide Derivatives
… families of [1+2] and [1+3] acyclic Schiff-base (imine) ligands using both di- or tri-aldehyde compounds and a variety of primary amines as precursors were prepared and fully characterised. These acyclic ligands have several extra functional groups attached, such as an OH or pyridine or imidazole …
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Synthesis of Electron Deficient N-heterocyclic-carbenes and Activity of Imidazol-2-imine Thioureate Ligand on Group 10 Transition Metals
… has resulted in the synthesis of new imidazol-2-imine ligands that have low activity towards ethylene polymerization due to their electron rich nature. In an attempt to alleviate this an electron poor naphthalene-1,4-dione-IMes imidazol-2-imine ligand (L) was synthesized in 90% yield (14a) and …
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Part I. Development of an enantioselective cyclopropanation reagent. Part II. Studies on the addition of organometallic reagents to imine derivatives
Efforts to develop an enantioselective zinc-based cyclopropanation reagent are described. Enantioselectivities of up to 24% e.e. were achieved using N-methylephedrine as a chiral controller ligand for iodomethylzinc cyclopropanations of cinnamyl alcohol. Chiral bis-ether complexes of …
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I Ceric ammonium nitrate-mediated oxidative cleavages of hemiacetals II Synthesis of beta-proline derivatives through the tandem chain extension-imine capture reaction
… tandem chain extension-imine capture reaction has also been developed to provide access to beta-proline derivatives. Two activated imines were studied and provided access to different diastereomers, making the chemistry versatile. beta-Keto esters, beta-keto amides, and …
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ΣΥΝΘΕΣΗ ΚΑΙ ΜΕΛΕΤΗ 0-ΚΙΝΟΝΙΜΙΝΟ-, 0-ΚΙΝΟΝΟ-ΜΕΘΙΔΟ- ΚΑΙ Ο-ΚΙΝΟΝΙΜΙΝΟ- ΜΕΘΙΔΟ- ΠΑΡΑΓΩΓΩΝ ΤΗΣ 9, 10-ΦΑΙΝΑΝΘΡΕΝΟΚΙΝΟΝΗΣ ΚΑΙ ΤΗΣ 1, 2-ΑΚΕΝΑΦΘΕΝΟΚΙΝΟΝΗΣ
10-METHOXY-IMINE-9-PHENANTHRENONE REACTS WITH STABLE AND SEMISTABLE YLIDES AND O-QUINONE-METHIDE IMINES ARE ISOLATED. SOME OF THEM ARE THERMALLY CYCLIZED TO CONDENSED HETERCYCLIC COMPOUNDS . 10-METHOXY-IMINE-9-PHENANTHRENONE REACTS WITH DIENOPHILES TO GIVE DIELS-ALDER PRODUCTS AND ALSO CONDENSED …
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Investigation of the Steric and Electronic Properties of 3-Iminophosphine Ligands in Chelated Palladium Allyl Complexes for Use in the Regioselective Hydroamination of Allenes
… phosphine, cyclobutene backbone, and tert-butyl imine provided the most active palladium catalyst for this hydroamination when compared to the other complexes in the collection. Larger alicyclic backbone sizes decrease catalytic activity, as does steric hindrance at the imine substituent group. …
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Heterocyclic Calix[4]arene Derivatives for Fluorescence Investigations
… butyl), and ortho, meta and para substituted di-imine bridged diphenol units. All these reactions yielded the desired product with the exception of the bis-bromoethyl variants which did not result in capped calix[4]arene formation. The resulting ligands were subjected to attempted metal …
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Synthesis of alkyl- and poly(ethylene)glycol linked bis-dioxocyclams from bis-chromium carbene complexes
… a dimerization reaction to form 14-membered bis-imine bis-dioxocyclams. Unfortunately, all attempts to reduce the imine-cyclams to give the stable dioxocyclams were unsuccessful. Both tri- and tetra(ethylene glycol) linked bis-chromium carbene complexes have been synthesized. These carbene …
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The yeast mediated synthesis of the l-ephedrine precursor, l-phenylacetylcarbinol, in an organic solvent
… methylamine to form the corresponding N-methyl imine; the final step employs a metal catalyst to facilitate the reduction of the imine with hydrogen. This study is focused on the first step of the synthesis, which suffers from the drawback that two by-products, benzyl alcohol and …
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