摘要:
Perfluoroalkyl aromatic compounds are prepared by reacting an aromatic bromide or iodide with at least about one equivalent of an organic acid salt corresponding to the formula set forth below in the presence of cuprous iodide and a diploar aprotic solvent: in which M is potassium or -NR¹R²R³R⁴; R¹, R², R³ and R⁴ are the same or different alkyl groups containing from 1 to 20 carbon atoms, and n is 0 when M is -NR¹R²R³R⁴ and 0 or an interger of at least 1 when M is potassium.
摘要翻译:全氟烷基芳族化合物是通过使芳香族溴化物或碘化物与至少约1当量的对应于下述式的有机酸盐在碘化亚铜和二元非质子溶剂:CHEM(其中M是钾) 或-NR 1 R 2 R 3 R 4; R 1,R 2,R 3和R 4是含有1至20个碳原子的相同或不同的烷基,当M是-NR 1 R 2时,n是0。 R 3,R 4和O,或者当M是钾时至少为1的整数。
摘要:
Novel compounds having greatest interest as biologically-active materials for the treatment of diabetic complications in mammals, or intermediates for such materials, are perfluoroalkyl compounds corresponding to the formula: wherein R and R′ are independently selected from chloro, fluoro, nitro, hydroxy, and alkyl and alkoxy substituents containing 1-6 carbons; Q is -CN, -COOL, -COX, or -CTN(R˝)CH₂COOL; L is hydrogen, alkali metal, or saturated hydrocarbyl; X is halo; T is oxygen or sulfur; R˝ is an alkyl group containing 1-6 carbons; m is 0 or 1; and n is an integer of at least one.
摘要:
Undesirable conversion of a silicon source, such as silane, in the freeboard above a fluidized bed of silicon particles in a fluidized bed reactor, can be reduced by cooling the gas within the freeboard. Preferably, the reduction in temperature is achieved by introducing into the freeboard a stream of relatively cool quench gas such as hydrogen, which also reduces the concentration of silane in the freeboard. As a result of these two factors, the invention improves the service factor of the fluidized bed apparatus and reduces the amount of silane conversion to undesired by-products.
摘要:
Polyfluoroalkoxyphosphazenes cured through eugenoxy groups result in elastomer compositions having higher modulus, tensile strength and elongation retention and lower compression set compared to a similar polyfluoroalkoxyphosphazene cured through conventional ortho-allylphenoxy groups.
摘要:
A polyphosphazene hydraulic fluid that remains solids-free on storage at temperatures down to -30°C over an extended period can be made by reacting a solution of sodium phenoxide, sodium m-methylphenoxide, sodium p-methylphenoxide and sodium trifluoroethoxide with a small stoichiometric excess of cyclic phosphonitrilic chloride oligomer, mainly trimer, and then reacting the remaining replaceable chlorine atoms with a solution of sodium trifluoroethoxide.
摘要:
Tetraalkylsilanes having one comparatively small alkyl group and three comparatively large alkyl groups are prepared from an alkali metal aluminum tetraalkyl by reacting with either an alkyl trihalosilane or a mixture of a silicon tetrahalide and a trialkyl aluminum.
摘要:
Non-polymer thickened multigrade engine oils based on synthetic hydrocarbons are provided. The SAE 10W-30 and SAE 15W-40 engine oils are derived from hydrogenated decene-1 oligomer mixtures wherein the oligomers range from C₃₀ up to C₇₀₊. Oligomer mixtures of specified oligomer distribution are combined with appropriate performance additives so that the engine oils meet the desired API Service Requirements for gasoline and/or diesel engine usage.
摘要:
Mono- and di-lower alkylamines, e.g. methylamine or dimethylamine, are alkylated by reaction with C₈₋₂₂ alcohol in the presence of hydrogen at a temperature of 150-275°C in contact with copper-zinc-alkaline earth metal base containing catalyst (e.g., CuO-ZnO-Ba(OH)₂) while removing water formed in the reaction.