Results 181 to 190 of about 174,921 (371)

Coordinative Ring‐Opening Polymerization of Limonene Carbamate towards Phosgene‐ and Isocyanate‐Free Polyurethane

Angewandte Chemie International Edition, Accepted Article.
This study presents a phosgene‐ and isocyanate‐free route for the synthesis of polyurethanes using (R)‐limonene as a bio‐based starting material. The synthesis of the cyclic limonene‐based carbamate monomer LU is achieved in high yields using dimethyl carbonate as a sustainable, less hazardous phosgene surrogate and is verified by NMR, SC‐XRD, ESI‐MS ...
Jonas Futter, Leon Ferdinand Richter, Stefanie Hörl, Bernhard Rieger, Moritz Kränzlein   +4 more
wiley   +1 more source

Asymmetric Syntheses via Heterocyclic Intermediates; XVII¹. Enantioselective Synthesis of (R)-α-Methyl-S-benzylcysteine Methyl Ester and (R)-α-Methyl-S-t-butylcysteine Methyl Ester Using L-Valine as Chiral Auxiliary Reagent

, 1983
Ulrich Groth, Ulrich Schöllkopf
openalex   +2 more sources

Chiral Lewis Acids as Enantioselective Catalysts in the Diels-Alder Reaction and the Allylic Addition to Aldehydes [PDF]

, 1990
A. KETTER, R. Herrmann
openalex   +1 more source

Mechanochemical Strategies Applied to the Late‐Stage Modifications of Pharmaceutically Active Compounds

Angewandte Chemie International Edition, Accepted Article.
This review explores the potential of mechanochemistry in the late‐stage modification of active pharmaceutical ingredients (APIs), offering a comprehensive analysis of methods designed to transform structurally complex molecular scaffolds. By examining the scope, efficiency, and mechanistic aspects of these approaches, the review highlights protocols ...
Johanna Templ, Lars Borchardt
wiley   +1 more source

Enantioselective Oxidation Catalyzed by Manganese(III)—Tetraphenylporphyrin—Bovine Serum Albumin Systems Modified or Unmodified with Poly(ethylene glycol) [PDF]

, 1991
Kohji Yoshinaga, Naoki Itoh, Taketoshi Kito   +2 more
openalex   +1 more source

Asymmetric .ALPHA.-substituted phenethylamines. II. The enantioselective synthesis of 1-aryl-2-phenylethylamines from L- and D-amino acids by means of 1,3-asymmetric induction.

, 1983
Yuji Suzuki, Hiroshi Takahashi
openalex   +2 more sources

Enantioselective conjugate addition of diethylzinc to chalcones catalysed by chiral Ni(II) aminoalcohol complexes [PDF]

, 1994
André H. M. de Vries, Johan F. G. A. Jansen, Ben L. Feringa   +2 more
openalex   +1 more source

Charge Relocation Enables a Modular and Diastereoselective Synthesis of cis‐Substituted Tetrahydrofurans

Angewandte Chemie International Edition, EarlyView.
A disconnection model in which acylium ions generated from acyl chlorides are treated with variety of alkenes is reported for the synthesis of 2,5‐cis‐disubstituted tetrahydrofurans (THFs) and other THF derivatives. A charge relocation process leads to the formation of oxocarbenium ions, which are reduced to the desired THF structures.
Zhi‐Jie Niu, Bogdan R. Brutiu, Margaux Riomet, Daniel Kaiser, Nuno Maulide   +4 more
wiley   +1 more source

An Approach to the Enantioselective Synthesis of 2-Azabicyclo[2.2.1]hept-5-en-3-one

, 1988
Franco Fernández, Eugenio Uriarte, Olga Caamaño, A. EIRIN, Generosa Gómez   +4 more
openalex   +1 more source

Half-Sandwich d⁶-Metal (Co^III, Rh^III, Ir^III, Ru^II)-Catalyzed Enantioselective C–H Activation

SynOpen, 2023
Pu-Fan Qian, Jun-Yi Li, Yi-Bo Zhou, Tao Zhou, Bing-Feng Shi   +4 more
doaj   +1 more source