scholarly journals Phosphine-promoted ring-opening of benzisothiazolinate ligands at a nickel(ii) centre: a convenient synthesis of Ni(ii)-thiolate complexes

2019 ◽  
Vol 48 (17) ◽  
pp. 5520-5522 ◽  
Author(s):  
Subhi A. Al-Jibori ◽  
Samer Hussein Ali ◽  
Ahmed S. Al-Janabi ◽  
Christoph Wagner ◽  
Graeme Hogarth
Keyword(s):  
Ring Opening ◽  
Thiolate Ligands ◽  
Convenient Synthesis ◽  
Bond Scission ◽  
Thiolate Complexes ◽  
Nitrogen Bond

Phosphines react with the benzisothiazolinate (bit) paddlewheel dimer, [Ni2(μ-bit)4·2H2O], resulting in sulfur–nitrogen bond scission and a series of unexpected transformations leading to novel Ni(ii) complexes containing 2-cyanophenylthiolate and related thiolate ligands.

Highly Fluorescent Au25-xAgx Nanoclusters Protected with Poly(ethylene glycol) - and Zwitterion-Modified Thiolate Ligands

2018 ◽  
Author(s):  
Dinesh Mishra ◽  
Sisi Wang ◽  
Zhicheng Jin ◽  
Eric Lochner ◽  
Hedi Mattoussi
Keyword(s):  
Quantum Yield ◽  
Near Infrared ◽  
Small Diameter ◽  
Binding Energies ◽  
Thiolate Ligands ◽  
Nir Emission ◽  
Thiolate Complexes ◽  
Long Lifetime ◽  
Poly Ethylene

<p>We describe the growth and characterization of highly fluorescing, near-infrared-emitting nanoclusters made of bimetallic Au<sub>25-x</sub>Ag<sub>x</sub> cores, prepared using various monothiol-appended hydrophobic and hydrophilic ligands. The reaction uses well-defined triphenylphosphine-protected Au<sub>11</sub> clusters (as precursors), which are reacted with Ag(I)-thiolate complexes. The prepared nanoclusters are small (diameter < 2nm, as characterized by TEM) with emission peak at 760 nm and long lifetime (~12 µs). The quantum yield measured for these materials was 0.3 - 0.4 depending on the ligand. XPS measurements show the presence of both metal atoms in the core, with measured binding energies that agree with reported values for nanocluster materials. The NIR emission combined with high quantum yield, small size and ease of surface functionalization afforded by the coating, make these materials suitable to implement investigations that address fundamental questions and potentially useful for biological sensing and imaging applications.<br></p>

Carbon–nitrogen bond cleavage of pyridine with two molecular substituted allenoates: access to 2-arylpyrimidin-4(3H)-one

2018 ◽  
Vol 54 (100) ◽  
pp. 14128-14131 ◽  
Author(s):  
Tao Jin ◽  
Hongdong Yuan ◽  
Shikuan Su ◽  
Xueshun Jia ◽  
Chunju Li ◽  
...  
Keyword(s):  
Benzene Ring ◽  
Ring Opening ◽  
Pyridine Ring ◽  
Bond Cleavage ◽  
Ring System ◽  
Nitrogen Bond

A DABCO-catalyzed annulation reaction of pyridin-2-amine and substituted allenoates enables the ring-opening of a pyridine ring system and the formation of two new rings including a pyrimidinone ring and a benzene ring.

scholarly journals Alkoxide-induced ring opening of bicyclic 2-vinylcyclobutanones: A convenient synthesis of 2-vinyl-substituted 3-cycloalkene-1-carboxylic acid esters

2012 ◽  
Vol 8 ◽  
pp. 650-657 ◽  
Author(s):  
Xiufang Ji ◽  
Zhiming Li ◽  
Quanrui Wang ◽  
Andreas Goeke
Keyword(s):  
Carboxylic Acid ◽  
Ring Opening ◽  
Claisen Rearrangement ◽  
Ring Cleavage ◽  
Unsaturated Ester ◽  
Supplementary Method ◽  
Convenient Synthesis ◽  
High Yields ◽  
Acid Esters

The fused 2-vinyl or 2-phenyl substituted cyclobutanones 4 undergo stereoselective ring openings by the action of alkoxide ions (t-BuO− or MeO−) to produce novel vicinally disubstituted cycloalkene derivatives 5 and 6 in moderate to high yields. The ring cleavage usually occurs with complete regioselectivity. The accessibility of γ,δ-unsaturated ester or acid derivatives makes this transformation a good supplementary method for the well-established Johnson–Claisen rearrangement.

Formation and Reactions of (1-Chloroalkyl)carbamoyl Chlorides. Synthesis of 1,2,4-Triazolidine-5-ones

1973 ◽  
Vol 51 (3) ◽  
pp. 333-337 ◽  
Author(s):  
Kinko Koyano ◽  
Colin R. McArthur
Keyword(s):  
Ring Closure ◽  
Convenient Synthesis ◽  
Effect Ring ◽  
Substituted Hydrazines ◽  
Nitrogen Bond

N-(α-Chlorobenzyl)carbaniloyl chloride and (α-chlorobenzyl)methylcarbamoyl chloride are formed by reaction of phosgene with N-benzylideneaniline and N-benzylidenemethylamine, respectively. Reaction of these carbamoyl chlorides with a number of nucleophiles is described, some of which cause cleavage of the benzyl to nitrogen bond while others give rise to substitution products without such cleavage. Of the latter type, substituted hydrazines react to effect ring closure to1,2,4-triazolidine-5-ones. The method serves as a convenient synthesis of these new heterocyclic systems.

Mechanism of Carbon–Nitrogen Bond Scission on Unsupported Transition Metal Sulfides

1998 ◽  
Vol 173 (2) ◽  
pp. 366-373 ◽  
Author(s):  
Martine Cattenot ◽  
Jean-Louis Portefaix ◽  
Julio Afonso ◽  
Michèle Breysse ◽  
Michel Lacroix ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Sulfides ◽  
Transition Metal Sulfides ◽  
Bond Scission ◽  
Nitrogen Bond
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