The crystal structure determination of polymeric [Cd(S2P(OCy)2)2(3-NC5H4C(H)NNC(H)C5H4N-3)·(CHCl3)2]∞, where Cy is cyclohexyl and the bridging ligand is 3-pyridinealdazine, shows that the cadmium atom exists within a trans-N2S4 donor set and that the resultant polymer topology is of a step-lad...

By mixing 0.5wt.% silver complex with 2-ethylhexyl phosphonic acid mono 2-ethylhexylester (AgL·HL) into a conventional zinc dithiophosphate (ZDTP), a new compounded extreme-pressure and antiwear as well as antiseizure additive was obtained. The antiseizure and load-carrying performance of the m...

Thermal films from zinc dialkyl dithiophosphate (ZDDP), an ashless shortchain dithiophosphate (DDP-1) and a longchain ashless dithiophosphate (DDP-2) were generated on steel substrates. XANES data was used to calculate phosphates chain lengths, P/S ratios and sulfate/sufide ratios at different t...

Nanoindentation tests were performed at several temperatures (24–80 °C) on one antiwear zinc dialkyl-dithiophosphate (ZDTP) tribofilm using a Nanoindenter XP® entirely set into a climatic chamber. Mechanical properties of the tribofilm were determined using a simple model. AFM observations wer...

Tribological and nanoscale properties of tribofilms from ashless dialkyl dithiophosphates (DDPs) were compared with zinc dialkyl dithiophosphates (ZDDPs) in this study. The tribosurfaces generated from these chemistries were examined using scanning electron microscopy and energy dispersive spect...

Understanding the true interfacial mechanisms involved in the growth of tribofilms generated by Zinc Dialkyl Dithiophosphate (ZDDP) is important because it is the most widely used anti-wear additive and there is legislative pressure to find efficient environmentally-friendly replacements. The ma...

We have explored the contact conditions under which zinc dialkyl dithiophosphate (ZDDP) is corrosive and, in the presence of carbon black, increases wear. It was found that the corrosivity of ZDDP to steel is due to a load dependent mechanochemical reaction and leads to the antagonism between ZD...

Zinc dialkyl dithiophosphate (ZDDP) as a well-known anti-wear additive enhances the performance of the lubricant beyond its wear-protection action, through its anti-oxidant and Extreme Pressure (EP) functionality. In spite of over thirty years of research attempting to reveal the mechanism of ac...

In the current study, sixteen novel derivatives of (R)-1-(6-fluorobenzo[d]thiazol-2-yl)ethanamine were synthesized as acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibitors. Chemical structures together with purity of the synthesized compounds were substantiated by IR, 1H, 13C, ...

This study successfully grafted multiwalled carbon nanotubes (MWCNTs) with maleic anhydride (Mah-g-MWCNTs) via Friedel–Crafts acylation with the aluminum chloride catalyst (AlCl3), investigated by Raman and TGA analysis. The covalent bonds and carboxylic groups of maleic anhydride provided addi...

In continuation of our previous study, a series of phenacyl esters of N-phthaloyl amino acids were synthesized and screened for their in vitro pancreatic lipase inhibitory activity. N-phthloylation of amino acids and subsequent esterification with different phenacyl bromides in presence of N,N-D...

2′-O-[2-(2,3-Diacetoxypropyl)amino-2-oxoethyl]uridine 3′-phosphoramidite was prepared and used in solid-phase synthesis to obtain oligonucleotides containing a 1,2-diol group, which may then be converted into a 2′-aldehyde group. The oligonucleotides were conjugated efficiently to various mol...

The solubility of ethyl 5-amino-4-cyano-3-(2-ethoxy-2-oxoethyl)-2-thiophenecarboxylate (ACET) in binary (acetone + methanol), (acetone + ethanol), (acetone + 1-butanol) and (acetone + isopropanol) solvent mixtures was investigated by the isothermal dissolution equilibrium method under 101.3 kPa....

Knowledge of solubility for ethyl 5-amino-4-cyano-3-(2-ethoxy-2-oxoethyl)-2-thiophenecarboxylate (ACET) in different solvents is essential for its purification and further theoretical studies. In this paper, the solubility of ACET in selected pure solvents, including methanol, ethanol, 1-butanol...

In this work 2-(bis(cyanomethyl)amino)-2-oxoethyl methacrylate monomer has been synthesized as newly, characterized both experimentally and theoretically. Experimentally, it has been characterized by FT-IR, FT-Raman, 1H and 13C NMR spectroscopy techniques. The theoretical calculations have been ...

A comparative study regarding cycloaddition versus amidation reactions of 2-amino-2-oxoethyl-phenanthrolinium ylides to activated alkynes and alkenes is presented. The reaction pathway is different, depending on dipolarophile (with triple or double bond) and ylide structures. The monoenamidation...

A series of hydrazone derivatives 5a–5i were synthesized through multi-step reactions. The 2-(2-oxo-1,2,3,4-tetrahydroquinoline-7-yloxy)acetohydrazide was prepared from 7-hydroxy-3,4-dihydroquinolin-2(1H)-one as starting material. Then the condensation of 2-(2-oxo-1,2,3,4-tetrahydroquinoline-7-...

Mexicanin I a new sesquiterpene lactone isolated from Helenium mexicanum H.B.K. has been correlated with tenulin.

□ The antitumor pseudoguaianolide tenulin has been exposed to a wide variety of biological and model nucleophilic reagents and has been shown to react exclusively with sulfur nucleophiles in a Michael-like fashion. The biological implications of these results are discussed.

Systematic structural modifications were performed on the natural sesquiterpene lactone tenulin to define those groupings essential to, or significant in, its in vivo antitumor activity. Accordingly, the following tenulin analogs were prepared: dihydrotenulin, 2,3-epoxytenulin, isotenulin, dihyd...