Molybdenum (VI) Complexes Containing Pyridylimine Ligands: Effect of the Imine Nitrogen Substituent in the Epoxidation Reaction

2020 ◽  
Author(s):  
Daniel Martínez‐Martínez ◽  
M. León Santiago ◽  
Rubén A. Toscano ◽  
Manuel Amézquita‐Valencia
Keyword(s):  
Imine Nitrogen ◽  
Epoxidation Reaction

scholarly journals A Highly Selective Turn-On Fluorescent Probe for the Detection of Zinc

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3825
Author(s):  
Ling-Yi Shen ◽  
Xiao-Li Chen ◽  
Xian-Jiong Yang ◽  
Hong Xu ◽  
Ya-Li Huang ◽  
...  
Keyword(s):  
High Selectivity ◽  
Fluorescence Probe ◽  
Stoichiometric Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Turn On ◽  
Imine Nitrogen ◽  
System A ◽  
Plot Analysis ◽  
L System

A novel turn-on fluorescence probe L has been designed that exhibits high selectivity and sensitivity with a detection limit of 9.53 × 10−8 mol/L for the quantification of Zn2+. 1H-NMR spectroscopy and single crystal X-ray diffraction analysis revealed the unsymmetrical nature of the structure of the Schiff base probe L. An emission titration experiment in the presence of different molar fractions of Zn2+ was used to perform a Job’s plot analysis. The results showed that the stoichiometric ratio of the complex formed by L and Zn2+ was 1:1. Moreover, the molecular structure of the mononuclear Cu complex reveals one ligand L coordinates with one Cu atom in the asymmetric unit. On adding CuCl2 to the ZnCl2/L system, a Cu-Zn complex was formed and a strong quenching behavior was observed, which inferred that the Cu2+ displaced Zn2+ to coordinate with the imine nitrogen atoms and hydroxyl oxygen atoms of probe L.

Synthesis of Fullerols as Polyhydroxylated Fullerene Derivatives

1992 ◽  
Vol 247 ◽  
Author(s):  
Long Y. Chiang ◽  
Ravi Upasani ◽  
John W. Swirczewski ◽  
Kathy Creegan
Keyword(s):  
Structural Components ◽  
Synthetic Methodology ◽  
Fullerene Derivatives ◽  
Aqueous Acid ◽  
Epoxidation Reaction ◽  
Electrophilic Reagents

ABSTRACTwe outline three methods for the preparation of fullerols as polyhydroxylated fullerene derivatives through the reaction of fullerenes with electrophilic reagents. The synthetic methodology includes a sequence of reactions using an aqueous acid chemistry, the epoxidation reaction, or the interesting nitronium chemistry as an key approach for the conversion of fullerenes to fullerols. The structure of fullerols was characterized and proposed to consist of at least 13 hydroxy functional moieties incorporating both hydroxy and hemi-ketal as parts of the structural components.

Epoxidation Reaction of 6β-Acetoxyeudesmenes and Acid-catalyzed Transformations of the Epoxy Compounds

1988 ◽  
Vol 51 (3) ◽  
pp. 475-483 ◽  
Author(s):  
E. Cabrera ◽  
A. Garcia-Granados ◽  
M. A. Quecuty
Keyword(s):  
Epoxidation Reaction ◽  
Acid Catalyzed

Coordination of the Hetero(N,S)- bidentate Ligand 1-Methyl-2- (methylthiomethyl)-1H-benzimidazole to [(Ph3P)Au)]+ Exclusively through the Imine Nitrogen Donor

1999 ◽  
Vol 54 (12) ◽  
pp. 1606-1608 ◽  
Author(s):  
Markus Albrecht ◽  
Klaus Hiibler ◽  
Wolfgang Kaim
Keyword(s):  
Positive Charge ◽  
Bidentate Ligand ◽  
Imine Nitrogen ◽  
Nitrogen Donor

1-Methyl-2-(methylthiomethyl)-1H- benzimidazole (mmb, N^S) was reacted with Ph3PAuCl/AgPF6 in THF to yield [(Ph3P)Au(mmb)](PF6) which could be crystallographically characterized. The Au+ ion is almost linearly coordinated by the triphenylphosphine P and the imine N atom of a monodentate N^S ligand. There is no gold(I)-sulfur bonding as the distance of ca. 3.02 Å indicates. Similarly, close intermetallic contacts between the gold centers are absent. Both effects are attributed to the positive charge on the metal.

Synthesis and Properties of 2-(Dimesitylboryl)benzylideneamines

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1381-1386 ◽  
Author(s):  
Zureima García-Hernández ◽  
François P. Gabbaï
Keyword(s):  
Excited State ◽  
Nitrogen Atom ◽  
Intramolecular Charge Transfer ◽  
Quantum Yields ◽  
Structural Studies ◽  
Green Fluorescence ◽  
Imine Nitrogen ◽  
Td Dft ◽  
Imine Nitrogen Atom ◽  
Boron Center

Lithiation of 2-(2-bromophenyl)-dioxolane (1) followed by reaction with dimesitylboron fluoride afforded 2-(2-dimesitylborylphenyl)-dioxolane (2) which was deprotected to afford 2- dimesitylboryl-benzaldehyde (3). Compound 3 reacts with aliphatic amines such as n-butylamine and ethanolamine to afford the corresponding imines 2-(dimesitylboryl)benzylidenebutylamine (4) and 2-(dimesitylboryl)benzylideneethanolamine (5), respectively. Structural studies indicate coordination of the imine-nitrogen atom to the boron center. Imines 4 and 5 emit a green fluorescence near 510 nm with quantum yields approaching 10%. TD-DFT calculations suggest that this emission arises from an intramolecular charge-transfer excited state

Facile synthesis of the enantiomers of frontalin

1984 ◽  
Vol 62 (11) ◽  
pp. 2148-2154 ◽  
Author(s):  
B. D. Johnston ◽  
A. C. Oehlschlager
Keyword(s):  
Asymmetric Epoxidation ◽  
Facile Synthesis ◽  
Epoxidation Reaction ◽  
Synthetic Sequence ◽  
Sharpless Asymmetric Epoxidation

S-(−)- and R-(+)-frontalin (1,5-dimethyl-6,8-dioxabicyclo[3.2.1]octane) were prepared from (E)-2-methyl-2,6-heptadiene-1-ol utilizing the Sharpless asymmetric epoxidation reaction to induce chirality. The six-step synthetic sequence proceeded in approximately 50% overall yield and was found to be suitable for the preparation of multi-gram quantities of either enantiomer with ≥ 90% ee.

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