Helical Structures of Nylon-Like Oligomers Consisting of 1,2-Diamine and 1,2-Dicarboxylic Acid Building Blocks Containing a Five-Membered Ring Constraint.
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DOI: 10.1002/cplu.202100239
Abstract: A series of nylon-like oligomers was synthesized, which consisted of alternating cyclic 1,2-diamine and 1,2-dicarboxylic acid building blocks with a five-membered ring constraint. The nylon 2 4 oligomers are symmetric and display helical structures similar… read more here.
Keywords: membered ring; dicarboxylic acid; like oligomers; nylon like ... See more keywords
Construction of a 21-Membered-Ring Orifice on [60]Fullerene.
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DOI: 10.1002/cplu.202300225
Abstract: Open-[60]fullerenes possessing a huge orifice with a ring-atom count exceeding 19 have been confined to only a few examples. Herein, we report a 20-membered-ring orifice which enables for a guest molecule such as H2, N2,… read more here.
Keywords: construction membered; group; ring orifice; membered ring ... See more keywords
Synthesis and Transformation of Triterpenoids with a β-Ketonitrile Fragment in Five-Membered Ring A
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DOI: 10.1007/s10600-020-03233-6
Abstract: Triterpenoids with a β-ketonitrile group in five-membered ring A were synthesized via intramolecular oxonitrile cyclization of C-3 methyl esters of 1-cyano-substituted 2,3-seco-triterpene acids. The intramolecular cyclization to form the triterpene ketonitriles and subsequent reduction of… read more here.
Keywords: membered ring; synthesis transformation; transformation triterpenoids; triterpenoids ketonitrile ... See more keywords
Hydrolysis mechanism of double six–membered ring pentaborate anion
Sign Up to like & getrecommendations! Published in 2020 at "Chemical Physics Letters"
DOI: 10.1016/j.cplett.2019.136930
Abstract: Abstract DFT-based calculations show that B5O6(OH)4- forms B5O5(OH)6− intermediate during the first step of hydrolysis. Then, the hydrolysis pathways are divided to principal and secondary reactions. In the principal reaction, hydrolysis occurs at the bridge… read more here.
Keywords: membered ring; six membered; occurs bridge; mechanism double ... See more keywords
Two novel C18-diterpenoid alkaloids, sinomontadine with an unprecedented seven-membered ring A and chloride-containing sinomontanine N from Aconitum sinomontanum
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DOI: 10.1016/j.tetlet.2017.03.013
Abstract: Astract Two new C18-diterpenoid alkaloids, sinomontadine (1) and sinomontanine N (2), were isolated from Aconitum sinomontanum. Their structures were determined by spectroscopic methods and X-ray crystallographic analysis. Sinomontadine (1) features an unprecedented skeleton containing a… read more here.
Keywords: membered ring; diterpenoid alkaloids; c18 diterpenoid; aconitum sinomontanum ... See more keywords
12-Membered Ring Carbides with Stabilization of Actinide Atoms.
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DOI: 10.1021/acs.inorgchem.1c03341
Abstract: Actinide (Th and U) carbides as the potential nuclear fuels in nuclear reactors require basic research in order to understand the thermodynamic stability and performance of these substances. Here we report the structural characterization and… read more here.
Keywords: c12; chemistry; ring carbides; carbides stabilization ... See more keywords
Left-Handed Helix of Three-Membered Ring Amino Acid Homopeptide Interrupted by an N-H···Ethereal O-Type Hydrogen Bond.
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DOI: 10.1021/acs.orglett.8b03331
Abstract: A chiral three-membered ring Cα,α-disubstituted α-amino acid ( R, R)-Ac3cdMOM, in which the α-carbon is not a chiral center, but two side chain β-carbons are chiral centers, was synthesized from dimethyl l-(+)-tartrate, and its homopeptides… read more here.
Keywords: membered ring; amino acid; left handed; hydrogen bond ... See more keywords
A three-membered ring approach to carbonyl olefination
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DOI: 10.1038/s41467-017-01036-y
Abstract: The carbon–carbon double bond, with its diverse and multifaceted reactivity, occupies a prominent position in organic synthesis. Although a variety of simple alkenes are readily available, the mild and chemoselective introduction of a unit of… read more here.
Keywords: membered ring; approach carbonyl; olefination; ring approach ... See more keywords
Improvement in aluminum complexes bearing a Schiff base in ring-opening polymerization of ε-caprolactone: the synergy of the N,S-Schiff base in a five-membered ring aluminum system.
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DOI: 10.1039/c8dt03285h
Abstract: A series of five-membered ring aluminum complexes bearing thiol-Schiff base ligands were synthesized, and their application in the ring-opening polymerization of ε-caprolactone (CL) was investigated. The complexes exhibited dramatically higher catalytic activity than the six-membered… read more here.
Keywords: aluminum; membered ring; five membered; schiff base ... See more keywords
Synthesis of N-unsubstituted cycloalkylimines containing a 4 to 8-membered ring.
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DOI: 10.1039/c9cc01755k
Abstract: Primary cycloalkylimines with a 4 to 8-membered ring were synthesized by dehydrocyanation of the corresponding α-aminonitriles on solid potassium hydroxide via a vacuum gas-solid reaction. Imine-enamine tautomerism has been demonstrated at room temperature for the… read more here.
Keywords: containing membered; membered ring; cycloalkylimines containing; unsubstituted cycloalkylimines ... See more keywords
A square planar silylene nickel four-membered ring.
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DOI: 10.1039/d1dt02846d
Abstract: Herein the new nickel silylene [PhC(NtBu)2SiNi(C5Me5)]2, which features a square planar central ring motif consisting of two silicon and two nickel atoms is presented. The title compound was obtained by an insertion of the Ni(0)… read more here.
Keywords: membered ring; planar silylene; square planar; silylene ... See more keywords