boron trifluoride
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2022 ◽  
Author(s):  
Mohanakumaran Athira ◽  
Snoxma Smile Suresh ◽  
Ponnusamy Shanmugam

An efficient method for the construction of the quinazolinone skeleton from the reaction of 9-(phenylethynyl)-9H-fluoren-9-ols with substituted 2-aminobenzamides catalyzed by boron trifluoride is achieved. Scope of the reaction with a...


Molbank ◽  
10.3390/m1312 ◽  
2021 ◽  
Vol 2022 (1) ◽  
pp. M1312
Author(s):  
Ida A. Lupanova ◽  
Dzhamilya N. Konshina ◽  
Nikita A. Elkov ◽  
Valery V. Konshin

Reaction of 1-(4-(dimethylamino)phenyl)-3,5-diphenylformazane with boron trifluoride diethyl etherate (5 equiv) in the presence of triethylamine (3 equiv) in toluene medium gave “boratetrazine”—2-(4-(dimethylamino)phenyl)-3,3-difluoro-4,6-diphenyl-3,4-dihydro -1,2,4,5,3-tetrazaborinin-2-ium-3-ide in a 58% yield.


Author(s):  
Raffeal Bennett ◽  
Ryan D. Cohen ◽  
Heather Wang ◽  
Tony Pereira ◽  
Mark A. Haverick ◽  
...  

Author(s):  
G. G. Sivets ◽  
A. V. Sivets

The method for synthesis of N-pentofuranosyl oxazolines was developed from the protected 1,2-O-acetonides of D-xylofuranose, -ribofuranose, and -arabinofuranose using boron trifluoride diethyl etherate, acetonitrile, and potassium hydrogen difluoride. A possible mechanism of the catalyzed reaction of acylated acetonides with acetonitrile in the presence of Lewis acid was considered in terms of the activation and cleavage of the 1,3-dioxalane part of the xylose derivative fol- lowed by the conversions of intermediates to α-isooxazoline. The hydrolysis reactions of N-α-glycosyl oxazolines were stud- ied in the acidic and neutral conditions. N-α-xylofuranosyl acetamide derivatives were prepared in high yields as a result of selective hydrolysis of protected α-xylofuranosyl isooxazolines in the neutral conditions.


2021 ◽  
Author(s):  
◽  
Richard Hubert Furneaux

<p>In a search for better synthetic routes to O- and S-glycosides, a number of mercury(II) containing derivatives of 1-thio-D-glucose were synthesised, and their reactions with thiols and acids were investigated as well as their pyrolytic behaviour. A new route to O-acetylated glycosyl thiols involving specific S-deacetylation of peracetylated 1-thioglycoses was developed by the conversion of 1-thio-Beta-D-glucopyranose pentaacetate into tetra-O-acetyl-1-S-phenylmercury (II) thio-Beta-D-glucopyranose and subsequent demercuration of this by hydrogen sulphide. A range of acylated alkyl and aryl 1,2-trans-1-thioglycosides was prepared by one step processes from peracylated 1,2-trans-related sugars by a procedure which involved the use of equimolar proportions of thiols together with boron trifluoride. A similar procedure was used to obtain benzoylated 1,2-cis-O-glucosides from penta-O-benzoyl-Beta-D-glucopyranose. Partial desulphurisation of acetylated glucosyl phenyl disulphide with tris(diethylamino)phosphine led to both phenyl tetra-O-acetyl-1-thio-alpha-D-glucopyranoside and the alpha, beta-linked thiotrehalose peracetate. Phenyl 1-thiohex-1-enopyranosid-3-ulose esters were obtained from the light induced reactions of N-bromosuccinimide with acetylated and benzoylated phenyl 1-thiogluco- and galacto-pyranosides; the acetylated 1-thioglycosides gave mixtures of 2-O-acetyl and 2-O-monobromoacetyl 1-enosid-3-uloses. Methyl hexuronate derivatives were brominated alpha to the carbonyl function by N-bromosuccinimide, and a new synthetic route to L-ascorbic acid has been proposed following the successful bromination of methyl tri-O-acetyl-2,6-anhydro-L-gulonate.</p>


2021 ◽  
Author(s):  
◽  
Richard Hubert Furneaux

<p>In a search for better synthetic routes to O- and S-glycosides, a number of mercury(II) containing derivatives of 1-thio-D-glucose were synthesised, and their reactions with thiols and acids were investigated as well as their pyrolytic behaviour. A new route to O-acetylated glycosyl thiols involving specific S-deacetylation of peracetylated 1-thioglycoses was developed by the conversion of 1-thio-Beta-D-glucopyranose pentaacetate into tetra-O-acetyl-1-S-phenylmercury (II) thio-Beta-D-glucopyranose and subsequent demercuration of this by hydrogen sulphide. A range of acylated alkyl and aryl 1,2-trans-1-thioglycosides was prepared by one step processes from peracylated 1,2-trans-related sugars by a procedure which involved the use of equimolar proportions of thiols together with boron trifluoride. A similar procedure was used to obtain benzoylated 1,2-cis-O-glucosides from penta-O-benzoyl-Beta-D-glucopyranose. Partial desulphurisation of acetylated glucosyl phenyl disulphide with tris(diethylamino)phosphine led to both phenyl tetra-O-acetyl-1-thio-alpha-D-glucopyranoside and the alpha, beta-linked thiotrehalose peracetate. Phenyl 1-thiohex-1-enopyranosid-3-ulose esters were obtained from the light induced reactions of N-bromosuccinimide with acetylated and benzoylated phenyl 1-thiogluco- and galacto-pyranosides; the acetylated 1-thioglycosides gave mixtures of 2-O-acetyl and 2-O-monobromoacetyl 1-enosid-3-uloses. Methyl hexuronate derivatives were brominated alpha to the carbonyl function by N-bromosuccinimide, and a new synthetic route to L-ascorbic acid has been proposed following the successful bromination of methyl tri-O-acetyl-2,6-anhydro-L-gulonate.</p>


2021 ◽  
Vol 10 (1) ◽  
pp. 53
Author(s):  
Franziska Verena Oberhaus ◽  
Dieter Frense

Due to their unique properties, polythiophene and other conductive polymers have become the subject of intensive research and are promising substrate materials for innovative and trendsetting applications. To this day, boron trifluoride diethyl etherate (BFEE) is the preferred solvent for the electropolymerization of thiophene, although it does not allow for reproducible film qualities due to its decomposition under ambient conditions. We therefore want to equip the reader with a starter kit for the electropolymerization of high-quality polythiophene films from stable solvents and a simple yet efficient method to remove the deposited films from the electrodes for their reuse. By drying the working solution prior to its utilization, and by adding a Lewis acid catalyst, films that display enhanced electron transfer and a smooth surface topography can be obtained, which can both be beneficial for the analytic performance of a subsequently built biosensor.


Author(s):  
David Bolonio ◽  
Yolanda Sánchez-Palencia ◽  
María-Jesús García-Martínez ◽  
Marcelo F. Ortega ◽  
José Eugenio Ortiz ◽  
...  

AbstractThe sodium form of Faujasite Y (Na-FAU) zeolite has been synthesized by the hydrothermal method, and it has been exchanged with ammonium sulphate and later with lanthanum (III) chloride solutions to obtain the La-FAU catalyst. The three zeolites Na-FAU, NH4+-FAU and La-FAU have been characterized by microcrystalline X-ray diffraction, X-ray fluorescence, surface area, pore volume and Brönsted acid sites. The La-FAU catalyst has been successfully activated with boron trifluoride etherate, and it has been tested in the alkylation reaction of isobutane with isobutene up to 112 h of time on stream, since the raw La-FAU catalyst showed a rapid deactivation.


2021 ◽  
Vol 21 (5) ◽  
pp. 1271
Author(s):  
Nguyen Quoc Thang ◽  
Tran Nguyen Minh An ◽  
Le Thi Thanh Tran ◽  
Do Tam Nhan ◽  
Mai Ngoc Tan ◽  
...  

In this study, the complex of difluoroboron, curcumin (BF2-Cur), has been synthesized and characterized via the combination of Boron trifluoride-diethyl etherate ((C2H5)2OBF3) and curcumin. However, the new dissociation constants, pKa1 and pKa2 of the BF2-Cur complex, have been indicted by the values of 8.44 ± 0.16 and 9.76 ± 0.13, respectively. On the other hand, the reagent was also used to determine As(III) in aqueous solutions by UV–Vis spectrophotometry. As a result, the method was validated for accuracy, precision, linearity, and sensitivity, and the linear range was from 1.0 to 25.0 µmol/L, with the linear regression, A = 0.0027 C + 0.0106, correlation coefficient R2 = 0.9969. Besides, the limit of detection (LOD) and limit of quantification (LOQ) were determined as 0.83 and 2.10 µmol/L, respectively. Thus, the developed method is successfully used for quantitative analysis of total arsenic in wastewater by reducing As(V) to As(III), then determining As(III) with high accuracy results.


Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5549
Author(s):  
Maria A. Trestsova ◽  
Irina A. Utepova ◽  
Oleg N. Chupakhin ◽  
Maksim V. Semenov ◽  
Dmitry N. Pevtsov ◽  
...  

Oxidative C-H/C-H coupling reactions of dipyrromethanes with azines in the presence of a heterophase oxidative photocatalytic system (O2/TiO2/visible light irradiation) were carried out. As a result of cyclization of obtained compounds with boron trifluoride etherate, new hetaryl-containing derivatives of 4,4-difluoro-4-boron-3a,4a-diaza-s-indacene were synthesized. For the obtained compounds, absorption and luminescence spectra, quantum yields of luminescence as well as cyclic volt-amperograms were measured.


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