Abstract: Mono-alkadienyl alkyl ethers and di-alkadienyl alkyl ethers are prepared by telomerization of a conjugated diene, by causing said conjugated diene to react with an aliphatic alcohol or an aliphatic diol respectively, by operating in an aqueous/organic biphasic liquid system, in the presence of a catalytic system formed by:(a) a palladium salt or complex;(b) an alkyl-, alkylcycloalkyl-, or alkylarylphosphine ligand, bearing an acidic or neutral hydrophylic moiety, having the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, x and y are as defined in the disclosure; and(c) an either inorganic or organic base.

Abstract: A catalytic system for the production of synthesis gas by reacting light hydrocarbons, preferably methane, with CO.sub.2 is described formed from:one or more compounds of metals of the platinum group, preferably chosen from rhodium, ruthenium and iridium;a support consisting of inorganic compounds chosen from oxides and/or spinels of aluminium, magnesium, zirconium, silicon, cerium and/or lanthanum, possibly in the presence of alkali metals,in which the weight percentage of the metal or metals of the platinum group in the catalytic system is between 0.01 and 20%, and preferably between 0.1 and 5%.

Abstract: A catalyst system for the liquid-phase production of methanol from synthesis gas is described, consisting of:one or more copper compounds;one or more alkoxides of the lanthanum group of formula (R.sub.1 O).sub.x Ln and/or one or more inorganic oxides of the lanthanum and/or aluminum group;one or more alkaline and/or alkaline-earth alkoxides of formula (R.sub.a O).sub.x M,if at least one alkoxide of the lanthanum group is present, then one or more alkoxides of the titanium group of formula (R.sub.t O).sub.x T,where R.sub.1, R.sub.a and R.sub.t, which can be the same or different, are C.sub.1 -C.sub.10 alkyl groups,M is the alkaline or alkaline-earth metal,Ln is an element of the lanthanum group,T is an element of the titanium group,x is equal to the valency of the metal or element.

Abstract: A catalyst system for the selective production of isoprenylalkylethers from isoprene is described, characterized by satisfying the following empirical formulaPdLxL'ywhere L is a phosphorated binder in the form of an organic derivative of trivalent phosphorous of type R.sub.3 P or R.sub.2 P[CH(R)].sub.z PR.sub.2, in which the substituents R, which can be identical or different, are either hydrogen atoms or alkyl, cycloalkyl, aryl, alkoxy, aryloxy, arylthio or arylalkyl groups, and in which z is a whole number between 1 and 5;L' is an easily displaceable binder chosen from dienes, olefins, anhydrides, diketones and nitriles;x is a whole number between 0 and 4 and y is a whole number between 0 and 3,in which system excess phosphorated compounds of R.sub.3 P or R.sub.2 P[CH(R)].sub.z PR.sub.2 type may or may not be present.

Abstract: A catalyst system for the selective production of isoprenylalkylethers from isoprene is described, characterized by satisfying the following empirical formulaPdLxL.sup.' ywhereL is a phosphorated binder in the form of an organic derivative of trivalent phosphorus of type R3P or R2P[CH(R)]zPR2, in which the substituents R, which can be identical or different, are either hydrogen atoms or alkyl, cycloalkyl, aryl, alkoxy, aryloxy, arylthio or arylalkyl groups, and in which z is a whole number between 1 and 5;L.sup.' is an easily displaceable binder chosen from dienes, olefins, anhydrides, diketones and nitriles;x is a whole number between 0 and 4 and y is a whole number between 0 and 3,in which system excess phosphorated compounds of R3P or R2P[CH(R)]zPR2 type may or may not be present.

Abstract: A process for producing methanol from synthesis gas in the liquid phase is disclosed, which comprises reacting CO with H.sub.2 in the presence of a catalytic system constituted by one or more copper compound(s) and one or more alkali metal and/or alkali-earth metal alkoxide(s), in the presence of one or more solvent(s), the basic features of which are in that to the reaction methanol and one or more alkyl formate(s) are added, with the process being carried out with a concentration of the catalytic system in the solution constituted by the solvents and the same catalytic system, which is comprised within the range of from 0.001 to 1 molar for the compound(s) of copper, and is comprised within the range of from 0.01 to 5 molar for the alkali metal and/or alkali-earth metal alkoxide(s), and at a temperature higher than 40.degree. C., and lower than 200.degree. C.