The synthesis of oximes containing the ferroin group

A series of oximes of substituted 2-pyridylmethyl and phenyl ketones has been prepared. These all contain the ferroin group (?N? C? C? N?). The 4-substituted pyridyl-syn-methyl and phenyl ketoximes form chelates with Fe(II).     

L’introduction des systèmes experts dans les télécommunications françaises

Annals of Telecommunications - Ce court article présente des systèmes experts en cours d’expérimentation dans les télécommunications françaises. Deux...     

Synthesis and Structure of a New Quinary Sulfide Halide: LaCa(2)GeS(4)Cl(3)

A new quinary rare earth sulfide-halide compound has been synthesized and its structure determined by single-crystal X-ray diffraction. LaCa(2)GeS(4)Cl(3) crystallizes in the noncentrosymmetric hexagonal space group -P6(3)mc (No. 186) with Z = 2, a = 9.731(1) ?, and c = 6.337(1) ?. Lanthanum and calcium are mixed on a pseudo-trigonal prismatic site, coordinated to three sulfur atoms on one triangular face and three chlorine atoms on the other. Isolated, slightly distorted tetrahedra of GeS(4) are oriented with a tetrahedral 3-fold axis aligned along the crystallographic 3-fold rotation axis. Preliminary optical studies indicate that this material has a useful optical window extending approximately from 0.5 to 10 &mgr;m. Nonlinear optical activity of LaCa(2)GeS(4)Cl(3) is demonstrated by the generation of green light when pumped with a 1.064 &mgr;m Nd:YAG laser.     

Study of the reaction of polyester resins with magnesium oxide

The reaction of polyester resin and magnesium oxide, which is the basis of the thickening process of sheet-molding compound technology, has been characterized in a systematic study. The effect of reactant equivalency ratios, temperature, and added water on viscosity development have been determined. Excess amounts of magnesium oxide are necessary for thickening. Water increases the initial rate of thickening but reduces the overall level attained. A new thickening mechanism is proposed on the basis of a model study with polyester resin and sodium hydroxide.     

The synthesis of polymethylquinolines and 1,10-phenanthrolines

Several polymethyl-1,10-phenanthrolines were synthesized by the use of 3-methyl-3-penten-2-one in Skraup reactions. The behavior of this ketone as well as that of 4-hydroxy-2-pentanone and 4-hydroxy-3-methyl-2-bulanone with various substituted anilines was studied.