Synonymer & Anagram | Engelska ordet ACHIRAL

Exempel på hur man kan använda ACHIRAL i en mening

• Stereocenters can exist on chiral or achiral molecules; stereocenters can contain single bonds or double bonds.
• However, in order for anomers to exist, the sugar must be in its cyclic form, since in open-chain form, the anomeric carbon atom is planar and thus achiral.
• the specific rotation of enantiopure 1-phenylethanol can be enhanced by the addition of achiral acetophenone as an impurity.
• Knowles developed one of the first asymmetric hydrogenation catalysts by replacing the achiral triphenylphosphine ligands in Wilkinson's catalyst with chiral phosphine ligands.
• Assuming the material is achiral, one can consider what values of permittivity (ε) and permeability (μ) result in negative phase velocity (NPV).
• Werner also described a second achiral hexol (a minor byproduct from the production of Fremy's salt) that he incorrectly identified as a linear tetramer.
• The achiral meso compound (1R,2S)-1,2-diphenyloxirane arises from cis-stilbene, though peroxide epoxidations of the cis-isomer produce both cis- and trans-epoxide products.
• When the substituents are achiral, these conformers are enantiomers (atropoenantiomers), showing axial chirality; otherwise they are diastereomers (atropodiastereomers).
• Ethambutol contains two constitutionally symmetrical chiral centers in its structure and exists in three stereoisomeric forms, the enantiomeric pair (+)-(S,S)- and (−)-(R,R)-ethambutol, along with the achiral stereoisomer called meso-form.
• Apart from the two infinite series of prismatic and antiprismatic symmetry, rotational icosahedral symmetry or chiral icosahedral symmetry of chiral objects and full icosahedral symmetry or achiral icosahedral symmetry are the discrete point symmetries (or equivalently, symmetries on the sphere) with the largest symmetry groups.
• Peptide nucleic acid (PNA) is a nucleic acid in which natural nucleic acid has been replaced by a synthetic peptide backbone formed from N-(2-amino-ethyl)-glycine units along with sugar phosphate backbone forming in an achiral and uncharged moiety that mimics RNA or DNA oligonucleotides.
• The original Hajos-Parrish procedure begins with an achiral triketone in dimethylformamide and 3% (molar) catalytic (S)(−)proline.
• Ground state diastereomers and enantiomers are of equal energy in the ground state, and when reacted with an achiral Lewis acid, their diastereomeric intermediates, transition states, and products are also of equal energy.
• Boehmer further explains this phenomenon by suggesting that if an inherently chiral calixarene macrocycle were opened up it would produce an "achiral linear molecule".
• This process involves starting with simple achiral aldehydes and converting them either to their SAMP or RAMP chiral hydrazones using SAMP or RAMP as a chiral auxiliary.
• Although examples of enantioselective α-ketol rearrangements starting from achiral α-hydroxy ketones are fairly limited, a number of examples of 1,2-asymmetric induction (due to stereoelectronic factors) have been observed.
• The proteinogenic amino acids are a small subset of this group that possess a central carbon atom (α- or 2-) bearing an amino group, a carboxyl group, a side chain and an α-hydrogen levo conformation, with the exception of glycine, which is achiral, and proline, whose amine group is a secondary amine and is consequently frequently referred to as an imino acid for traditional reasons, albeit not an imino.
• By attaching a chiral phenylethylamine ligand to an achiral lead bromide perovskite nanoplatelet, a chiral inorganic-organic perovskite is formed.
• The article pertains to how the indium complex bearing either the chiral or achiral ligand allows for the polymerization of racemic lactide into a highly heterotactic polylactic acid and how the indium complex along with the chiral ligand polymerizes meso-lactide into virtually atactic polylactic acid.
• Vedejs also tackled a wide range of methodologies aimed at stereoselective synthesis including protonation of carbanions, acylation and alkylation of achiral and prochiral nucleophiles, parallel kinetic resolution, and control of configuration by crystallization-induced asymmetric transformation.

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