Copper(ii)-catalyzed protoboration of allenes in aqueous media and open air

2021 ◽  
Author(s):  
Russell F. Snead ◽  
Jan Nekvinda ◽  
Webster L. Santos
Keyword(s):  
Boronic Acid ◽  
Room Temperature ◽  
Aqueous Media ◽  
Boronic Acid Derivatives

A copper(ii)-catalyzed internal protoboration of monosubstituted allenes efficiently occurs in water at room temperature and open air to generate 1,1-disubstituted vinyl boronic acid derivatives.

Temperature Dependence of the Self-Assembled Styrene Based Random Ionomers in Aqueous Solution

2003 ◽  
Vol 775 ◽  
Author(s):  
Sung-Hwa Oh ◽  
Ju-Myung Song ◽  
Joon-Seop Kim ◽  
Hyang-Rim Oh ◽  
Jeong-A Yu
Keyword(s):  
Partition Coefficients ◽  
Room Temperature ◽  
Aqueous Media ◽  
The Self ◽  
Spectroscopic Methods ◽  
Ion Content ◽  
Repeat Units ◽  
Notable Effect ◽  
Order Of Magnitude ◽  
Experimental Errors

AbstractSolution behaviors of poly(styrene-co-sodium methacrylate) were studied by fluorescence spectroscopic methods using pyrene as a probe. The mol% of methacrylate was in the range 3.6–9.4. Water and N,N-dimethylforamide(DMF) mixture was used as a solvent (DMF/water = 0.2 mol %). The critical micelle (or aggregation) concentrations of ionomers and the partition coefficients of pyrene were obtained the temperature range 10–80°C. At room temperature, the values of CMCs (or CACs) were in the range 4.7 ×10-6 5.3 ×10-6 g/mL and we could not find any notable effect of the content of ionic repeat units within the experimental errors. Unlike CMCs, as the ion content increased, partitioning of pyrene between the hydrophobic aggregates and an aqueous media decreased from 1.5 ×105 to 9.4 ×104. As the temperature increased from 10 to 80 °C, the values of CMCs increased less than one order of magnitude. While, the partition coefficients of pyrene decreased one order of magnitude and the effect of the ion content became negligible.

Synthesis of Sugar–Boronic Acid Derivatives: A Class of Potential Agents for Boron Neutron Capture Therapy

2017 ◽  
Vol 19 (7) ◽  
pp. 1678-1681 ◽  
Author(s):  
Daniela Imperio ◽  
Erika Del Grosso ◽  
Silvia Fallarini ◽  
Grazia Lombardi ◽  
Luigi Panza
Keyword(s):  
Boron Neutron Capture Therapy ◽  
Neutron Capture ◽  
Boronic Acid ◽  
Neutron Capture Therapy ◽  
Boron Neutron Capture ◽  
Boronic Acid Derivatives

One-Pot Synthesis of Water Soluble, Extremely Small-Sized Superparamagnetic Magnetite Nanoparticles

2012 ◽  
Vol 531 ◽  
pp. 219-222
Author(s):  
Li Hua Shen ◽  
Ting Shang ◽  
Jun Zhou ◽  
Dong Wang ◽  
Yu Han ◽  
...  
Keyword(s):  
Magnetite Nanoparticles ◽  
Room Temperature ◽  
Colloidal Stability ◽  
Aqueous Media ◽  
Mri Contrast Agents ◽  
Water Soluble ◽  
Potential Candidate ◽  
One Pot ◽  
Mri Contrast

Extremely small-sized superparamagnetic magnetite nanoparticles of 3Cit). The resulting Cit-coated magnetite nanoparticles exhibited long-term colloidal stability in aqueous media without any surface modification. Regarding the magnetic properties, the nanoparticles were superparamagnetic at room temperature, and might be the potential candidate for MRI contrast agents.

Recognition and sensing of various species using boronic acid derivatives

2012 ◽  
Vol 48 (48) ◽  
pp. 5956 ◽  
Author(s):  
Zhiqian Guo ◽  
Injae Shin ◽  
Juyoung Yoon
Keyword(s):  
Boronic Acid ◽  
Boronic Acid Derivatives

Efficient synthesis of pyrido[2,3-d]pyrimidine-7-carboxylic acids catalyzed by a TiO2/SiO2 nanocomposite in aqueous media at room temperature

2018 ◽  
Vol 73 (9) ◽  
pp. 641-645 ◽  
Author(s):  
Sepehr Sadegh-Samiei ◽  
Shahrzad Abdolmohammadi
Keyword(s):  
Heterogeneous Catalyst ◽  
Carboxylic Acids ◽  
Room Temperature ◽  
Aqueous Media ◽  
Reaction Times ◽  
Molar Ratio ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
Moderate Reaction ◽  
Recyclable Heterogeneous Catalyst

AbstractA novel and efficient synthesis of eight 5-aryl-1,3-dimethyl-2,4-dioxo-1,2,3,4,5,8-hexahydropyrido[2,3-d]pyrimidine-7-carboxylic acids using a TiO2/SiO2 nanocomposite with a molar ratio of 1:1 as a recyclable heterogeneous catalyst is described. The desired products, five of which are new, are formed in short reaction times (2–3 h) with high to excellent yields (94%–98%) under very moderate reaction conditions (room temperature, aqueous media).

scholarly journals Photophysical Studies on Drug Conjugates of Stavudine/Zidovudine and 1,8-Naphthalimide in Different Solvent Systems

2021 ◽  
Vol 33 (11) ◽  
pp. 2729-2736
Author(s):  
Nidhi Singh ◽  
Farha Naaz ◽  
Rajesh Verma ◽  
Shivendra Singh ◽  
Ramendra K. Singh
Keyword(s):  
Room Temperature ◽  
Aqueous Media ◽  
Fluorescence Measurement ◽  
Drug Conjugates ◽  
Coupling Reagent ◽  
Body Level ◽  
Photophysical Studies ◽  
Solvent Systems ◽  
Hiv Drugs ◽  
Anti Hiv

A number of fluorescent conjugates of popular anti-HIV drugs 2′,3′-didehydro-2′,3′-dideoxythymidine (stavudine, d4T) and 3′-azido-3′-deoxythymidine (zidovudine, AZT) with 1,8-naphthalimide were synthesized using the coupling reagent dicyclohexylcarbodiimide (DCC) in the presence of 4-dimethylaminopyridine (DMAP) and N,N-dimethylformamide (DMF) as solvent at room temperature. The steady-state fluorescence measurement studies on these conjugates showed solvatochromic effect. Further, the fluorescence of drug conjugates was recorded in the presence of ions like Na+ and K+ at body level concentration of 135-145 mmol L-1 and 3.6-5.1 mmol L-1, respectively, in phosphate buffer at pH 7.4 in aqueous media. It was observed that the drug conjugates did not show appreciable fluorescence quenching in presence of ions and buffer.

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