Dichloroborane-dimethyl sulfide reduces a variety of organyl azides, such as primary, secondary, tertiary, and aromatic to the corresponding amines in excellent yields. Cycloalkyl and benzylic azides are also readily reduced by this reagent. The reduction of azide with BHCl2 SMe2 is highly selec...
Chiral Lewis acids derived from 1,8-Naphthalenediylbis(dichloroborane), a novel bidentate Lewis acid, have been found to be active catalysts for the asymmetric Diels-Alder reaction. Utilizing chiral ligands derived from amino acids and diols, a range of enantioselectivities have been achieved wi...
Chiral Lewis acids derived from 1,8-Naphthalenediylbis(dichloroborane), a novel bidentate Lewis acid, have been found to be active catalysts for the asymmetric Diels-Alder reaction. Utilizing chiral ligands derived from amino acids, a range of enantioselectivities have been achieved with cyclope...
Chemical vapor deposition (CVD) of boron by hydrogen reduction of BCl3 on a hot tungsten substrate was investigated in a parallel flow reactor. Effect of substrate temperature (1100–1250°C) on the relative rates of formation of BHCl2 and boron was observed by the on-line analysis of the reacto...
(Z)-1-trimethylsilyl-1-alkenes easily prepared by the hydroboration of the corresponding 1-trimethylsilyl-1-alkynes followed by protonolysis with acetic acid, readily react with dichloroborane–dioxane complex in dichloromethane for 6 h. The resulting solution is then treated with 1,3-propane di...
We show evidence of simultaneous coordination of 2, 6-dimethylpyranone by 1, 8-naphthalenediylbis(dichloroborane) in solution.
The microwave spectrum of dichloroborane has been observed and the rotational constants of four isotopic species are determined as follows: A = 46911.09(7), B = 3185.937(10) and C = 2980.425(14) MHz for the normal species, A = 46747.14(8), B = 3099.543(14) and C = 2904.037(14)MHz for BHCl37Cl, A...
Terminal alkynes and alkenes were conveniently hydroborated to the corresponding alkenyl- and alkyldichloroboranes using dichloroborane–dioxane in dichloromethane. These dichloroboranes were hydrolyzed by water to the corresponding alkenyl- and alkylboronic acids in moderate to good yields. Wit...
A new nonlinear optical single crystal yttrium calcium borate Y2CaB10O19 (YCB) was grown for the first time from its melt. The starting materials were prepared by the solid-state reaction method. The melting point of the synthesized material was identified to be 967 °C. YCB crystal exhibits mon...
Calcium bismuth borate glasses doped with Eu3 + were prepared using a rapid melt quenching technique. The general physical properties of the glasses, including density, molar volume, and refractive index, were studied. Furthermore, the structural and optical properties as well as the thermal sta...
Effective atomic number acts as a fundamental property of compounds and mixtures and it plays a vital role in the computation of various dosimetric parameters such as buildup factor, effective dose and heat generation. Effective atomic numbers have been computed in the energy range from 1 keV to...
An aqueous solution route has been developed to prepare calcium sodium borate compositions of the formula xB2O3·(100–x)(0.5CaO·0.45Na2O·0.05P2O5) (36.2 ≤ x ≤ 61.3 mol%). The effect of heat-treatment and melt-quenching on the structure and physical properties was investigated using differen...
The aim of this study is to prepare and investigate the thermoluminescence characteristics for the un-doped and Cu2O doped calcium lithium borate glass upon adding various Cu2O concentrations of 0.005% to 0.1 mol%. The glasses were prepared by melt quenching method and irradiated with 60CO gamma...
In this study, we developed a simple, fast and low-cost method for the preparation of lamellar calcium hydroxide particles (Ceg-Ca(OH)2) from chicken eggshell (Ceg) waste. The flame-retardant effect of these particles has been evaluated into ethylene vinyl acetate copolymers (EVA) alone or in co...
In this paper, a series of calcium borate/graphene oxide (CB/GO) composites were synthesized using borax, calcium nitrate and graphene oxide by hydrothermal method. The composites were characterized by means of Fourier transform-infrared spectroscopy (FT-IR), Raman, transmission electron microsc...
Bi2O3 was replaced with Nb2O5 to improve the optical absorption of calcium bismuth borate glass. Series of five samples were prepared according to the chemical formula 60 B2O3 – x Nb2O5 - (20-x) Bi2O3 – 20 CaO, where x = 0, 2.5, 5, 7.5 and 10 mol%, where all compositions were a melted and quen...
By simple hydrothermal method, nanorods of barium boate were successfully loaded on reduced graphene oxide sheets. Powder XRD confirms the incorporation of barium borate (2θ = 29°, (202)) along with the transition of graphene oxide (2θ = 12°, (001)) into reduced graphene oxide (2θ = 25°, (...
Saline groundwater is presently used, when feasible, for hydraulic fracturing operations of unconventional shale resources. In certain geographies, the saline groundwater possesses high boron concentration which is incompatible with the field fracking chemicals; hence, a low boron concentration ...
Chemical oxo-precipitation (COP) has become a promising method for treating boron wastewater at room temperature; it uses hydrogen peroxide to convert boric acid to perborate species, which are precipitated using alkaline earth metals. In this work, solubility models of barium perborates were es...
Boron-based glasses are relevant materials for optical applications on account its ability to hold large amount of oxide modifiers and rare-earth ions. The barium borates ones are particularly interesting due to its designed second and third-order optical nonlinearities. Despite the interest on ...
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