Results 21 to 30 of about 15,265 (249)

“Polytopal Rearrangement Model of Stereoisomerization” and Its Potential as the Basis for a Systematic Model of All Stereoisomerism [PDF]

ACS Organic & Inorganic Au
Peter J. Canfield, Jeffrey R. Reimers, Maxwell J. Crossley   +2 more
doaj   +2 more sources

Design, Synthesis and Biological Evaluation of Neogliptin, a Novel 2-Azabicyclo[2.2.1]heptane-Based Inhibitor of Dipeptidyl Peptidase-4 (DPP-4)

Pharmaceuticals, 2022
Compounds that contain (R)-3-amino-4-(2,4,5-trifluorophenyl)butanoic acid substituted with bicyclic amino moiety (2-aza-bicyclo[2.2.1]heptane) were designed using molecular modelling methods, synthesised, and found to be potent DPP-4 (dipeptidyl ...
Ivan O. Maslov, Tatiana V. Zinevich, Olga G. Kirichenko, Mikhail V. Trukhan, Sergey V. Shorshnev, Natalya O. Tuaeva, Maxim A. Gureev, Amelia D. Dahlén, Yuri B. Porozov, Helgi B. Schiöth, Vladimir M. Trukhan   +10 more
doaj   +1 more source

First Trifluoromethylated Phenanthrolinediamides: Synthesis, Structure, Stereodynamics and Complexation with Ln(III)

Molecules, 2022
The first examples of 1,10-phenanthroline-2,9-diamides bearing CF3-groups on the side amide substituents were synthesized. Due to stereoisomerism and amide rotation, such complexes have complicated behavior in solutions. Using advanced NMR techniques and
Yuri A. Ustynyuk, Pavel S. Lemport, Vitaly A. Roznyatovsky, Konstantin A. Lyssenko, Alexey O. Gudovannyy, Petr I. Matveev, Ennie K. Khult, Mariia V. Evsiunina, Vladimir G. Petrov, Igor P. Gloriozov, Anton S. Pozdeev, Valentine S. Petrov, Nane A. Avagyan, Alexander S. Aldoshin, Stepan N. Kalmykov, Valentine G. Nenajdenko   +15 more
doaj   +1 more source

Stereoselectivity in spontaneous assembly of rolled incommensurate carbon bilayers

Nature Communications, 2021
Incommensurate pairing is a type of stereoisomerism, observed in carbon bilayers, that arises from the twisted orientations of the graphitic layers. Here, the authors create a finite molecular version of an incommensurate carbon bilayer in the form of ...
Taisuke Matsuno, Yutaro Ohtomo, Maki Someya, Hiroyuki Isobe   +3 more
doaj   +1 more source

Development of an open-source software for isomer enumeration

Journal of Cheminformatics, 2023
This article documents enu, a freely-downloadable, open-source and stand-alone program written in C++ for the enumeration of the constitutional isomers and stereoisomers of a molecular formula.
Salomé R. Rieder, Marina P. Oliveira, Sereina Riniker, Philippe H. Hünenberger   +3 more
doaj   +1 more source

Synthesis and structure of trans-1,2,3-tris(3-thenoyl)cyclopropane: erratum [PDF]

, 1994
Misleading statements in the paper by Saba [Acta Cryst.
Saba, Antonio
core   +2 more sources

Early contributions of crystallography to the atomic theory of matter

Substantia, 2019
After briefly presenting early hypotheses on the submicroscopic origin of symmetry and polyhedral morphology in the crystals, the structural model proposed by Haüy in 1784, based on the periodic repetition of integrant molecules made up of simple ...
Giovanni Ferraris
doaj   +1 more source

Stereoisomerism in pentaerythritol-bridged cyclotriphosphazene tri-spiranes: spiro and ansa 1,3-propanediyldioxy disubstituted derivatives [PDF]

, 2005
Four isomeric products were isolated and purified from the reaction of 1,3-propanediol with the tetra-spirane cyclophosphazene-organophosphate compound (1): viz. the di-monospiro (2a), di-monoansa (2b) and two monospiro-monoansa derivatives (2c) and (2d).
Aylin, U., Coles, Simon J., Davies, David B., Eaton, R.J., Hursthouse, Michael B., Kiliç, A., Shaw, Robert A.   +6 more
core   +1 more source

Structural and stereogenic properties of spiro- and ansa-substituted 1,3-propanedioxy derivatives of a spermine-bridged cyclotriphosphazene [PDF]

, 2006
Reaction of 1,3-propanediol with the achiral spermine-bridged cyclophosphazene 1 at various molar ratios in THF gives a number of spiro-and ansa-derivatives that exhibit different stereogenic properties, viz. racemic, meso or achiral forms. As expected,
Adem Kılıç, Alkubaisi, Allen, Beşli, Beşli, Beşli, Brandt, Coles, Coles, Contractor, David B. Davies, Davies, Dez, Fraser, Gönül Yenilmez Çiftçi, Kılıç, Labarre, Labarre, Otwinowski, Pirkle, Porwolik-Czomperlik, Rinaldi, Robert A. Shaw, Robert J. Eaton, Shaw, Sheldrick, Sheldrick, Simon J. Coles, Sullivan, Weissman   +29 more
core   +1 more source

Pyrethroid Stereoisomerism: Diastereomeric and Enantiomeric Selectivity in Environmental Matrices – A Review

Orbital: The Electronic Journal of Chemistry, 2018
Pyrethroids are chiral insecticides characterized by stereoisomerism, which occurs due to the presence of one to three asymmetric (chiral) carbons, generating one or two pairs of cis/trans diastereomers, and two or four pairs of enantiomers ...
Cláudio Ernesto Taveira Parente, Claudio Eduardo Azevedo-Silva, Rodrigo Ornellas Meire, Olaf Malm   +3 more
doaj   +3 more sources