Chemistry and toxicology of quinoxaline, organotin, organofluorine, and formamidine acaricides.

Quinoxaline, organotin, organofluorine, and formamidine compounds are among the newer pesticide chemicals used for acarine control. Included in these four classes are some of the most selective synthetic organic toxicants currently in the acaricide/insecticide arsenal. Oxythioquinox, Plictran (tricyclohexylhydroxytin), Nissol [2-fluoro-N-methyl-N-(1-naphthyl)acetamide], and chlordimeform are examples of quinoxaline, organotin, organofluorine, and formamidine acaricides, respectively. The chemistry and toxicology of these and related compounds are discussed

Polarization And Piezoelectric Properties Of A Nitrile Substituted Polyimide

This research focuses on the synthesis and characterization of a piezoelectric (b-CN)- APB/ODPA polyimide. The remanent polarization and piezoelectric d 31 and g 33 coefficients are reported to assess the effect of synthesis variations. Each of the materials exhibits a level of piezoelectricity which increases with temperature. The remanent polarization is retained at temperatures close to the glass transition temperature of the polyimide. INTRODUCTION Fluoropolymers and copolymers such as polyvinylidene fluoride (PVDF) currently represent the state of the art in piezoelectric polymers. The development of other classes of piezoelectric polymers such as polyimides could provide enabling materials technology for a variety of aerospace and commercial applications. Due to their exceptional thermal, mechanical, and dielectric properties, polyimides are already widely utilized as matrix materials in aircraft and as dielectric materials in microelectronic devices. Particularly interesting i..

Original scientific paper

A linear solvation energy relationship study for the reactivity o

Synthesis and Bioactivity of New Phosphorylated

Abstract: R,R’-disubstituted sulfoximines were phosphorylated with O,O–diethylchloro phosphate and phosphorothionate to obtain new organophosphorus compounds. After purification they were characterized by GC-MS and 1 H-NMR. The toxicity of the synthesized O,O-diethyl N-(R,R’-disubstituted sulfoximine) phosphoro-amidothionates was assayed on Musca domestica. It was found that the methyl phenyl derivative was the most toxic compound, followed by the dipropyl and dibutyl derivatives. The dihexyl compound was the less toxic of all the assayed compounds, being one hundred times less toxic than a paraoxon standard The anticholinesterasic activity of the corresponding phosphoramidates was assayed on homogenates of house flies ’ heads, giving values similar to paraoxon for the methyl phenyl derivative