摘要:
A method of synthesizing biodegradable aliphatic polyesters from one or more aliphatic dicarboxylic acids or diesters of the said acids and one or more linear or branched aliphatic glycols, comprising a first esterification or transesterification step and a second deglycolation under vacuum step, in which the catalyst is monobutylstannoic acid both for the esterification or transesterification step and for the deglycolation under vacuum step.
摘要:
New organic phosphites of the formula ##STR1## are used as stabilizers for polymers and other organic materials. The definition of groups R, R', and R.sub.1 may be found in the disclosure.
摘要:
A process for the manufacture of o-nitrobenzaldehyde by oxidation of o-nitrotoluene, characterized in that o-nitrotoluene is made to react with an aqueous solution containing Cerium.sup.iv perchlorate and from 5 to 9 moles/liter of perchloric acid; according to a preferred embodiment, the dispersion of o-nitrotoluene in an aqueous solution containing from 5 to 9 moles per liter of perchloric acid is first prepared and then an aqueous solution is gradually added, containing Cerium.sup.iv perchlorate and 5-9 moles/liter of perchloric acid.
摘要:
Phenyl pyruvic acid and substituted derivatives thereof are synthesized by catalytic carbonylation of a benzyl halide in the presence of a catalytic system based on carbonyl complexes of cobalt or precursors thereof.
摘要:
This invention relates to a process for preparing phenylacetic acid. In particular, the present invention relates to a catalytic process for the synthesis of the alkaline salts of phenylacetic acid by carbonylation of benzyl halides in a diphase system in the presence of cobalt carbonyl complexes. More particularly, the present invention relates to a process for preparing alkaline salts of phenylacetic acid by reacting a benzyl halide selected from chloride and bromide with carbon monoxide in the presence of a catalyst consisting in a salt of cobalt hydrocarbonyl, characterized in that the reaction is conducted in an aqueous/organic diphase system consisting of (a) an aqueous solution of an inorganic alkaline base, and (b) the benzyl halide in an organic solvent, in the presence of a catalyst system composed by a quaternary alkylammonium salt and by a cobalt hydrocarbonyl salt, at atmospheric pressure and at a temperature ranging from 20.degree. to 70.degree. C about.
摘要:
Process for recovering and re-using cobalt and tungsten from reaction liquors, in which said reaction liquors are treated:a) With an alkali-earth metal hydroxide in order to precipitate cobalt and tungsten, and the resulting precipitate is subsequently treated with a strong mineral acid in order to be able to dissolve the cobalt salt and separate it from H.sub.2 WO.sub.4 precipitate; orb) With an alkali metal hydroxide in order to precipitate and separate Co(OH).sub.2, and the resulting alkaline solution is then treated with an alkali-earth metal compound which is filtered and treated with a strong mineral acid in order to obtain H.sub.2 WO.sub.4
摘要翻译:用于从反应液中回收和再次使用钴和钨的方法,其中处理所述反应液:a)用碱土金属氢氧化物以沉淀钴和钨,然后用强矿物处理所得沉淀物 酸以便能够溶解钴盐并将其与H 2 WO 4沉淀物分离; 或b)用碱金属氢氧化物以沉淀和分离Co(OH)2,然后用碱土金属化合物处理所得的碱性溶液,碱土金属化合物被过滤并用强无机酸处理以获得H 2 WO 4
摘要:
A method of preparing carboxylic acids or esters thereof by the oxidative cleavage of unsaturated fatty acids or esters thereof is carried out in a two-phase aqueous-organic system in which the organic phase contains the unsaturated fatty acid and/or the esters thereof and the aqueous phase contains hydrogen peroxide. The oxidative cleavage is carried out in the presence of a catalytic system including a catalyst belonging to the group constituted by tungstic and molybdic acids and alkaline salts thereof, and an onium salt which acts as a phase-transfer agent for the catalyst, and has the formula:(R.sub.2 R.sub.3 R.sub.4 R.sub.5 M).sup.+ Y.sup.-in which R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent hydrocarbon groups of which at least one must have more than 10 carbon atoms,M is N or P, andY.sup.- is an inorganic anion.
摘要翻译:通过不饱和脂肪酸或其酯的氧化裂解制备羧酸或其酯的方法是在有机相含有不饱和脂肪酸和/或其酯的两相水 - 有机体系中进行的, 水相含有过氧化氢。 氧化裂解在催化体系存在下进行,催化体系包括属于由钨酸和钼酸及其碱式盐构成的组的催化剂,以及作为催化剂的相转移剂的鎓盐, 式(R 2 R 3 R 4 R 5 M)+ Y-,其中R 2,R 3,R 4和R 5表示至少必须具有多于10个碳原子的烃基,M是N或P,Y-是无机阴离子。
摘要:
A process for the synthesis of phenyl substituted aromatic diols, obtained by dehydrogenation of the corresponding substituted cyclohexyl derivatives in the presence of a palladium supported catalyst, said palladium supported catalyst being prepared by a process which comprises treating a palladium hydrolysis compound with reducing agents.
摘要:
Melt-formable thermotropic liquid crystalline polymers containing groups derived from terephthalic acid and a mixture of phenyl hydroquinone, 2-(.alpha.-phenylisopropyl) hydroquinone and, if desired, 2,5 bis (.alpha.-phenylisopropyl) hydroquinone.