scholarly journals A facile synthesis of functionalized 7,8-diaza[5]helicenes through an oxidative ring-closure of 1,1’-binaphthalene-2,2’-diamines (BINAMs)

2015 ◽  
Vol 11 ◽  
pp. 9-15 ◽  
Author(s):  
Youhei Takeda ◽  
Masato Okazaki ◽  
Yoshiaki Maruoka ◽  
Satoshi Minakata
Keyword(s):  
Physicochemical Properties ◽  
Functional Group ◽  
Ring Closure ◽  
Synthetic Method ◽  
Facile Synthesis

A facile and moderately functional-group-tolerant synthetic method for the preparation of 7,8-diaza[5]helicenes has been developed. It comprises of an oxidative ring-closing process of 1,1’-binaphthalene-2,2’-diamine (BINAM) derivatives with a chlorine-containing oxidant (t-BuOCl) in the presence of a base (2,6-lutidine). In addition the basic physicochemical properties of newly synthesized compounds have been investigated.

Relationship between the Differences of Odor Detection Threshold Values Measured by Different Methods and some of the Physicochemical Properties

2013 ◽  
Vol 807-809 ◽  
pp. 451-455 ◽  
Author(s):  
Di Fang ◽  
Jie Min Liu ◽  
Qin Yi
Keyword(s):  
Physicochemical Properties ◽  
Functional Group ◽  
Saturated Vapor ◽  
Detection Threshold ◽  
Threshold Values ◽  
Odor Detection ◽  
Linear Relationships ◽  
Odor Detection Threshold ◽  
The Difference ◽  
The Relationship

The amount of sample can enter the nasal cavity depends on the physiochemical characteristics such as distribution, volatility and solubility. It can be suspected that the difference of odor detection threshold (ODT) measured by different methods is related to the physicochemical properties of compounds. To investigate the relationship between ODT differences and the physicochemical properties of compounds, ODT values of four series of organic compounds were measured by triangle odor bag method and gas chromatography and olfactometry method; the results were compared and the absolute differences were calculated. Relationship between ODT differences and the type of functional group and some of the physicochemical properties of compounds was analyzed. The results showed the type of functional group had significant effect on the differences. Certain linear relationships between the logarithmic value of differences and the logarithmic values of saturated vapor pressure and molecular weight were observed.

Copper-Catalyzed Decarboxylative N-Arylation of Indole-2-carboxylic Acids

Synthesis ◽  
2019 ◽  
Vol 51 (08) ◽  
pp. 1803-1808 ◽  
Author(s):  
Yan Zhang ◽  
Zhe-Yao Hu ◽  
Xin-Chang Li ◽  
Xun-Xiang Guo
Keyword(s):  
Carboxylic Acids ◽  
Functional Group ◽  
Aryl Halides ◽  
Synthetic Method ◽  
Alternative Route ◽  
Reaction Proceeds ◽  
High Yields

A novel decarboxylative N-arylation of indole-2-carboxylic acids with aryl halides is developed. The reaction proceeds efficiently in the presence of Cu2O as the catalyst to give the corresponding N-aryl indoles in high yields. This synthetic method shows good functional group tolerance and offers an alternative route to construct N-aryl indoles.

Facile synthesis and characterization of a SnO2-modified LiNi0.5Mn1.5O4 high-voltage cathode material with superior electrochemical performance for lithium ion batteries

2017 ◽  
Vol 19 (15) ◽  
pp. 9983-9991 ◽  
Author(s):  
Feng Ma ◽  
Fushan Geng ◽  
Anbao Yuan ◽  
Jiaqiang Xu
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Lithium Ion Batteries ◽  
High Voltage ◽  
Lithium Ion ◽  
Synthesis And Characterization ◽  
Synthetic Method ◽  
Facile Synthesis ◽  
Li Ion

The SnO2-modified LiNi0.5Mn1.5O4 high-voltage Li-ion cathode material exhibits superior electrochemical performance, and the synthetic method has the advantage of being facile.

ChemInform Abstract: Facile Synthesis of 3a,6a-Dihydrofuro[2,3-b]furans and Polysubstituted Furans Involving Dearomatization of Furan Ring via Electrocyclic Ring-Closure.

ChemInform ◽  
2012 ◽  
Vol 43 (21) ◽  
pp. no-no
Author(s):  
Biaolin Yin ◽  
Guohui Zeng ◽  
Congbi Cai ◽  
Fanghua Ji ◽  
Li Huang ◽  
...  
Keyword(s):  
Furan Ring ◽  
Ring Closure ◽  
Facile Synthesis

scholarly journals Influence of Oxidation Degree on the Physicochemical Properties of Oxidized Inulin

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1025
Author(s):  
Franklin Afinjuomo ◽  
Paris Fouladian ◽  
Thomas G. Barclay ◽  
Yunmei Song ◽  
Nikolai Petrovsky ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Functional Group ◽  
Spherical Shape ◽  
Differential Scanning Calorimetric ◽  
Gravimetric Analysis ◽  
Oxidation Degree ◽  
Peak Intensity ◽  
13C Nuclear Magnetic Resonance ◽  
Thermal Stability Of

This paper reports the oxidation of inulin using varying ratios of sodium periodate and the characterization of the inulin polyaldehyde. The physicochemical properties of the inulin polyaldehyde (oxidized inulin) were characterized using different techniques including 1D NMR spectroscopy, 13C Nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetric (DSC), ultraviolet-visible spectroscopy (UV), and scanning electron microscopy (SEM). The aldehyde peak was not very visible in the FTIR, because the aldehyde functional group exists in a masked form (hemiacetal). The thermal stability of the oxidized inulin decreased with the increasing oxidation degree. The smooth spherical shape of raw inulin was destructed due to the oxidation, as confirmed by the SEM result. The 1HNMR results show some new peaks from 4.8 to 5.0 as well as around 5.63 ppm. However, no aldehyde peak was found around 9.7 ppm. This can be attributed to the hemiacetal. The reaction of oxidized inulin with tert-butyl carbazate produced a carbazone conjugate. There was clear evidence of decreased peak intensity for the proton belonging to the hemiacetal group. This clearly shows that not all of the hemiacetal group can be reverted by carbazate. In conclusion, this work provides vital information as regards changes in the physicochemical properties of the oxidized inulin, which has direct implications when considering the further utilization of this biomaterial.

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