摘要:
Zirconium and hafnium boride precursor complexes are prepared by deposition from solution, and yield metal borides upon heating at mild temperatures and ambient pressure.
摘要:
Alkali-metal tetraorganylborate compounds of formula MBR.sub.4 are prepared by reacting triorganylboranes R.sub.3 B with alkali-metal hydroxide or alkoxide compounds of the formula MOR.sup.1.
摘要:
A process is disclosed for transforming a saturated reactant (e.g. 1,1,2-trichloro-1,2,2-trifluoroethane) into a saturated product (e.g. 1,1-dichloro-1,2,2,2-tetrafluoroethane) by contacting a gaseous mixture comprising said reactant with an aluminum fluoride catalyst at an elevated temperature, which is characterized using a catalyst composition consisting essentially of an aluminum fluoride prepared by the reaction of aluminum hydroxide and HF. Also disclosed is a process for producing 2-chloro-1,1,1,2-tetrafluoroethane and/or 1,1,1,2-tetrafluoroethane by hydrodechlorinating 1,1-dichloro-1,2,2,2-tetrafluoroethane produced by said transformation.
摘要:
A process for preparing chemically stable compositions of tetra(hydrocarbyl)metallic compounds in solution, and an improved process for the preparation of active 1-olefin polymerization catalysts.
摘要:
A process for forming polysilanes from silicon hydrides by contacting the silicon hydride with catalytic amounts of selected scandium, yttrium and rare earth metal hydrides, and a process for hydrosilation of alpha-olefins in which an alpha-olefin is contacted with a silicon hydride in the presence of catalytic amounts of selected scandium, yttrium and rare earth metal compounds.
摘要:
The oxidation and extraction steps in the vanadium stripping process (e.g., the DEPA-TOPO or DOPPA-TOPO process) are carried out simultaneously for recovering vanadium from wet-process phosphoric acid.