The unstable sodium borohydride is stabilized on modified poly(4-vinylpyridinium), and it is used as an efficient and regenerable polymer-supported borohydride reagent for the reduction of a variety of carbonyl compounds, such as aldehydes, ketones, α,β-unsaturated carbonyl compounds, α-diket...

In this study, the effects of the additive thiourea (TU) have been investigated under steady state/steady-flow and uniform state/uniform-flow systems with the aim of minimizing the anodic hydrogen evolution on Pd in order to increase the performance of a direct borohydride fuel cell. The fuel ce...

Chiral phosphine oxide BINAPO, which was readily prepared from chiral phosphine BINAP, exhibited good catalytic activities in the reaction of trichlorosilyl compounds via hypervalent silicate intermediates. The allylation of aldehydes with allyltrichlorosilanes in the presence of a catalytic amo...

This paper describes the design and synthesis of 3-(3-(trichlorosilyl)propoxy)propanoyl chloride (MEG-Cl), a compound capable of forming functionalizable monolayers on hydroxylated surfaces. The compound was synthesized in high purity, as suggested by nuclear magnetic resonance analysis, and in ...

A new practical enzymatic synthesis of (R)-(+)- and (S)-(−)-2-acetoxycyclobutanone acetals with 97–99.9% ee has been carried out via enzymatic transesterification of readily available racemic 2-hydroxycyclobutanone acetals. The absolute configuration has been established by X-ray analysis of th...

Unknown spiro-cyclopropanated 1-aminopyrrol-2-ones are regioselectively prepared in high yields by Bi(OTf)3-catalyzed one-pot ‘Mukaiyama–Michael addition/cyclization/ring-contraction’ reactions of 1,2-bis(trimethylsilyloxy)cyclobutene with 1,2-diaza-1,3-butadienes at room temperature.

The surface modification of silica particles by an organic functional group has been intensively studied, and the modified structure can be analyzed by various experiments and simulations. Cinnamyl alcohol and cinnamoyl chloride are well known for their photo-dimerization reactions. By introduci...

The development of information and communications technology (ICT) has promoted the rapid growth of e-commerce, which has gradually changed the city. Networking and migration are also key driving forces for contemporary urban development. Although a growing body of literature has studied e-comme...

Acetalation of sucrose with 2,2-dimethoxypropane in 1,4-dioxane in the presence of p-toluenesulfonic acid, followed by acetylation, afforded methyl 4,6-di-O-acetyl-1,3-O-isopropylidene-α-d-fructofuranoside and 4-O-acetyl-2,3:5,6-di-O-isopropylidene-d-glucose dimethyl acetal as major products, w...

Conformation of 1,3-dimethoxypropane has been studied in the gas phase (approximately 120–180°C). Vicinal coupling constants 3JHH and 3JCH determined by 1H and 13C NMR were analysed within the rotational isomeric state approximation. The trans and gauche couplings required in this analysis wer...

High-level ab initio quantum chemistry calculations are shown to predict conformer populations of 1,2-dimethoxypropane and 5-methoxy-1,3-dioxane that are consistent with gas-phase NMR vicinal coupling constant measurements. The conformational energies of the cyclic ether 5-methoxy-1,3-dioxane ar...

Diethers are an important group of electron donors in Ziegler–Natta catalysts. A simple diether, 1,3-dimethoxypropane was studied as an electron donor in Grignard–Wurtz synthesis of a MgCl2–donor adduct. 1,3-Dimethoxypropane was unexpectedly found to undergo a cleavage reaction during the syn...

Previous studies of the conformational behaviour of a group of synthetic pyrethroid insecticides have been extended to a more structurally diverse set. This includes compounds with different backbones and differing stereochemistry, with both Types I and II biological activity. These compounds al...

Central administration of exogenous cyclo(His-Pro) (CHP) is known to produce hypothermia in rodents. In the present study, we examined the role of endogenous CHP in cold-induced hypothermia in the desert rat, Mastomys natalensis. The results of these studies show that a rise in hypothalamic CHP ...

A simple and mild synthesis of a new family of cyclopeptide analogues cyclo[-Arg-Gly-Asp-Ψ(triazole)-Gly-Xaa-] that is obtained by cyclization with click chemistry was investigated. In addition, the method was also successfully expanded to the synthesis of their analogues of different ring size...

The relative cleavage of an alcohol from a panel of amino esters and amino carbonates via intramolecular cyclization was examined as a mechanism for substrate release. Thermal stability at 37 °C was observed only for the seven-membered ring progenitors. Applicability of the approach was illustr...

Two new 14-noreudesmane sesquiterpenes, one new phenylpropane heterodimer, caulilexin C, and uvaol were isolated from the 70% MeOH extract of the fruit peel of Elaeagnus rhamnoides. The structures of the compounds were elucidated by HRESIMS and advanced NMR methods. The absolute configuration of...

Two series of styrylcarbonyl 3‐phenylsydnone derivatives, 4‐[1‐oxo‐(3‐substituted aryl)‐2‐propenyl]‐3‐phenylsydnones (series I, 1–21) and 3‐[4‐[3‐(substituted aryl)‐1‐oxo‐2‐propenyl]phenyl]sydnones (series II, 22–40), were synthesized and evaluated pharmacologically at a dose o...

AimsWe evaluated biological activity in leukemia cells lines of R and S enantiomers of tert-butyl 4-[(3-nitrophenoxy)-methyl]-2,2-dimethyloxazolidine-3-carboxylate (BNDC).

The aim of this work was to study the effect of hexakis(4-nitrophenoxy) cyclotriphosphazene (HNCP), which was found to be a highly efficient and intumescent flame retardant, on the thermal properties and flame retardancy of poly(ethylene terephthalate) (PET). HNCP was synthesized for use as flam...