Abstract:
Aldehydes, ketones, esters and lactones may be reduced using a reductant system consisting of a silane derivative and a metal hydride to give good yields of the corresponding alcohols. The reductant system used in the method enables preferential reduction of the carbonyl function. In one embodiment, the reductant system consists of polymethylhydroxysilane and a metal hydride, the hydride being prepared in situ or ex situ from a metal salt or complex by means of a reaction with a reducing agent.
Abstract:
Aldehydes, ketones, esters and lactones may be reduced using a reductant system consisting of polymethylhydroxysilane (PMHS) and a metal hydride to give good yields of the corresponding alcohols. The reductant system used in the method enables preferential reduction of the carbonyl function.
Abstract:
The compounds of the invention are characterised by the formulae ##STR1## wherein index p represents an integer equal to 2 or 3 and q can take the value zero or 1, with the provision that p+q=3. Said compounds are obtained from hex-3-yne-2,5-diol following a process which comprises reacting an ethylenic compound of formula(CH.sub.3).sub.2 C.dbd.C(H).sub.n (CH.sub.3).sub.m (I)wherein index n represents an integer equal to 1 or 2 and m can take the values zero or 1 and wherein n+m=2, with hex-3-yne-2,5-diol, followed by the oxidation of the acetylenic ether obtained by means of ruthenium tetroxide. The compounds of formula (III) can be used as intermediate products for the preparation of 4-hydroxy-2,5-dimethyl-3(2H)-furanone (Furaneol.RTM.).
Abstract:
A process which comprises reacting an aliphatic or cycloaliphatic olefin, having 4 to 16 carbon atoms in its main chain and a non-terminal double bond, with a carboxylic acid, in the presence of hydrogen peroxide and a catalyst consisting of a palladium salt or complex.
Abstract:
The invention concerns a process for the oxidative conversion of methane or natural gas to higher hydrocarbons, particularly ethylene and ethane, characterized in that a methane-oxygen mixture is passed over a contact mass consisting of at least one compound pertaining to the family of rare-earth metal carbonates. It concerns particularly the use of rare-earth oxycarbonates, more particularly lanthanum oxycarbonate La.sub.2 O.sub.2 (CO.sub.3), as contact mass.
Abstract translation:本发明涉及将甲烷或天然气氧化转化成高级烃,特别是乙烯和乙烷的方法,其特征在于甲烷 - 氧混合物通过由至少一种稀有金属族化合物组成的接触物质, 土金属碳酸盐。 它特别涉及稀土碳酸酯,特别是氧化碳酸镧La 2 O 2(CO 3)作为接触质量的用途。
Abstract:
Methyl ketones are prepared in liquid phase by oxidizing terminal olefins of the formula R--CH.dbd.Ch.sub.2, where R is a hydrocarbon radical. The oxidizing agent is hydrogen peroxide or an organic hydroperoxide, and the catalyst is a palladium catalyst of the formula Pd AA' whereA is fluoborate, acetate or trifluoroacetate, andA' is OOR.sub.1 and where R.sub.1 is a hydrocarbon radical.
Abstract:
Process for manufacturing solid catalysts, useful for oxidizing olefins containing from 2 to 16 carbon atoms per molecule to the corresponding carbonyl derivatives, comprising the step of impregnating a carrier with a substantially non-aqueous solution, containing at least two components [A] and [B] of the general formulas:[A] = M.sub.1 X.sub.n L.sub.m[B] = M.sub.2 Z.sub.p L'.sub.qwherein M.sub.1 is rhodium or palladium, X and Z are each an anionic group, n and p are integers selected from 1, 2 and 3, m being an integer selected from 1, 2, 3 and 6 or being 0, M.sub.2 is a metal selected from iron, copper, manganese and cobalt, q is an integer selected from 1 to 6 or is equal to 0 and L and L' are each a coordinate selected from water or an organic compound, said impregnation being conducted in the presence of at least one halogen, a halohydric acid or an organic or inorganic halide.