(wherein R' and Rare the same or different and each repre sent a hydrogen atom or an alkyl group, or form an alkylene group by binding to each other at the ends thereof; R and R are the same or different and each represent a hydrogen atom or an alkyl group, or form an alkylene group by binding to each other at the ends thereof; A represents a single bond or a methylene group; and X represents a...

The synthesis and use of cyclic alkylene carbonates as reactive intermediates first appeared in the literature more than 50 years ago. However, the range of their usefulness in industrial applications has only been fully realized in the past decade. In this article, numerous reactive applications of the cyclic alkylene carbonates, specifically the five-membered cyclics, are discussed. In additi...

A series of enolic Schiff base aluminum(III) complexes LAlR (where L=NNOO-tetradentate enolic Schiff base ligand) containing ligands that differ in their steric and electronic properties were synthesized. Their single crystals showed that these complexes are five-coordinated around the aluminum center. Their coordination geometries are between square pyramidal and trigonal bipyramidal. Their ca...

A simple and general procedure has been developed for the syntheses of ordered largepore (up to 14 nm) mesoporous metal oxides, including TiO2, ZrO2, Nb2O5, Ta2O5, Al2O3, SiO2, SnO2, WO3, HfO2, and mixed oxides SiAlOy, Al2TiOy, ZrTiOy, SiTiOy, ZrW2Oy. Amphiphilic poly(alkylene oxide) block copolymers were used as structure-directing agents in nonaqueous solutions for organizing the network-form...

Poly(arylene alkylene piperidinium)s show greatly improved alkaline stability and ion conductivity in comparison to current state of the art poly(arylene piperidinium)s.

A simple condu ctometric t it ration method is disc Ll ssed for the determination of sulfhydryl groups in nonionic polym er n etwork s, s Llch as disulfide a nd alkylene sulfide crosslinked polycaprolactam fibers. The diffusion of the t itrant into t he crosslinked polymer is acco mplished ' by swelling t he ne twork struc t ure, thereby eliminating the necessity of d estroying t he crosslinks ...

In search for selective anti-insect agents some monoand bis-isothiocyanates were prepared and tested on third instar larvae of Manduca sexta. The alkylene-bis-isothiocyanates 4, 5 and 6 had a novel effect preventing formation of the abdominal spiracles and of the hooks (crochets) at the following molt to the 4th instar. Some of these larvae died in the molt, while spiracles remained absent also...