The amidine organocatalyst 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) is an effective nucleophilic catalyst. Biocomposites with tuneable properties were successfully synthesized by ring-opening graft polymerization (ROGP) of propylene carbonate (PC) onto xylan using DBU as a catalyst in the ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl). The effects of reaction temperature, rea...

Large discrete supertetrahedral clusters of metal chalcogenides are rare due to the difficulty crystallizing solids in which negative charge cluster is balanced by positive charges countercations. Here, we describe a ligand-free T3 cluster, [Ga10S16(SH)4]6−, was successfully synthesized presence superbase 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) using neutral surfactant polyethyleneglycol (PEG)...

A simple, regioselective synthesis of di-indole sulfides by electrophilic aromatic substitution the C3-position indoles was achieved using Xtalfluor-E as sulfenylating reagent. The addition amine bases found to have a significant effect on reaction outcome, with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) switching off reactivity XtalFluor-E, while hindered base 2,6-ditertbutyl-4-methylpyridine (D...

Efficient conversion of glucose to 5-hydroxymethylfurfural (HMF), an important platform molecular for fuels and chemicals, is a promising topic in green chemistry. In this work, several new DBU-based (DBU = 1,8-diazabicyclo[5.4.0]undec-7-ene) ionic liquids (ILs) with benzene sulfonate (BS) anion were synthesized and used as the solvents for the dehydration of glucose to HMF. It was found that a...

Evaluation of a new proton sponge, bis-1,1,8,8-(tetramethylguanidino)naphtalene (TMGN), in substituted phenols O-alkylation by methyl iodide in DMF has been studied. Kinetic measurements were performed in N,N-dimethylformamide-d7 and followed by H NMR using stoichiometric amounts of reagents. Plot of the results shows that the reaction follows an almost perfect second order rate law. However th...

New pincer ruthenium complexes, [Ru(SCS)(tpy)]PF(6) (1) (SCS = 2,6-bis(benzylaminothiocarbonyl)phenyl), tpy = 2,2':6',2''-terpyridyl) and [Ru(SNS)(tpy)]PF(6) (2) (SNS = 2,5-bis(benzylaminothiocarbonyl)pyrrolyl), having κ(3)SCS and κ(3)SNS pincer ligands with two secondary thioamide units were synthesized by the reactions of [RuCl(3)(tpy)] with N,N'-dibenzyl-1,3-benzenedicarbothioamide (L1) and ...

A series of benz[a]azulenes reacted with pyridinium hydrobromide perbromide (PHBPB) in hydrous tetrahydrofuran yielding the corresponding benz[a]azulenequinones moderate yields. The detailed structure benz[a]azulenequinone derivative obtained was clarified by single crystal X-ray analysis.

A comparative study of the cleavage efficiency of succinyl, phthaloyl, oxalyl, 2-(2-nitrophenyl)ethyl, 9-fluorenylmethyl, and 2nitrophenyl supports in 0.5M DBU solutions is described. A decrease in cleavage efficiency is observed when small oligonucleotides containing thymidine are linked to the supports. In these conditions oxalyl supports gave the best yields followed by 2-(2-nitrophenyl)ethy...