The presence of two different central atoms increases the strength of Lewis–Brnsted superacidsAcid strengthSuperacidsSuperhalogensAb initio calculationsThe existence, thermodynamic stability, and gas phase acidity of two series of dinuclear Lewis-Brnsted superacids (HB2F7, HAl2F7, HAlBF7 and HAs2...
How many electron dots are in the Lewis structure of SO_3^{2-}? How many total valence electrons are in the compound NCl3? How many lone pairs are on each of the following atoms? a. Br in HBr? A. 0 B. 1 C. 2 D. 3 E. 4 b. S in H_2S? A. 0 B. ...
Some binary covalent compounds have a simple molecular unit in which a single central atom is bonded to multiple terminal atoms. The central atom may retain some of its starting valence electrons, resulting in non-bonding (lone) pairs. Over...
Dap into the oligopeptide backbone. Orthogonally-protectedmeso-oxa-Dap was first produced by the Vederas group via a Lewis acid-catalyzed aziridine ring opening with a serine nucleophile26. The succinct synthesis of thismeso-Dap analog makesmeso-Dap peptides more attractive synthetic targets in ...
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achieved using a stoichiometric quantity of Lewis acid Sc(OTf) 3 in acetonitrile under moderate dilution conditions to afford the hemicryptophanes mixture. The diastereomeric pair (M)- (S,S,S)-(S,S,S)-1 and (P)-(S,S,S)-(S,S,S)-1 was separated by column chromatography on silica ge...
1). Class A peptidomimetics, which are very similar to type I, are structures that mainly consist of parental peptide amino acid sequences. In class B mimics, different amino acids are substituted for their natural counterparts, desired molecule features are defined, and major chemical alterations...
Super-atoms were not well-represented in the datasets used and generally, there was an insufficient sampling of various atoms. The datasets used did not encompass all the possible chemical structures and hence, some of the more complex features were not tested for. ...
, in fact, turn acquisition, commissioning and production structures on their heads. Gone will be the days where writers created stories and sold them in their entirety, probably for single platform production and distribution, but possibly with opportunities forrepurposingon alternate mediums. The ...
The theory of hybridization can be used to explain the bonding behavior of atoms in a molecule. This theory states that atomic orbitals can combine resulting in the formation of hybrid orbitals. The type of hybridization determines many properties of the molecule....