摘要:
A process for the preparation of 2,6-dialkyl-naphthalenes comprising selectively alkylating naphthalene or 2-alkyl-naphthalene with alkylating agent in the presence of a zeolite catalyst at 250.degree. to 345.degree. C. which dialkyl-naphthalenes are useful for the preparation of naphthalene 2,6-dicarboxylic acid used to produce high-quality polyesters or polyamides.
摘要:
Process for the preparation of monoisopropylnaphthalene by alkylation of naphthalene with the aid of zeolites of the faujasite type as catalysts, wherein the cations of the zeolites have been replaced by alkaline earth metal ions.
摘要:
A process for the acylation of naphthyl ethers of the formula ##STR1## using acylating agents of the formula R.sup.2 --CO--X to give acylated naphthyl ethers of the formula ##STR2## in which R.sup.1 and R.sup.2 independently of one another are C.sub.1 -- to C.sub.10 -alkyl, C.sub.2 -- to C.sub.10 -alkenyl or C.sub.3 - to C.sub.8 -cycloalkyl and R.sup.2 is additionally C.sub.6 - to C.sub.10 -aryl and X is Cl, Br, --OCOR.sup.2, OH or C.sub.1 - to C.sub.3 -alkoxy, comprises carrying out the reaction presence of zeolite catalysts which have the formula Z.Al.sub.2 O.sub.3.x SiO.sub.2 (III) in the anhydrous and template-free form, in which Z is M.sup.I.sub.2 O, M.sup.II O and/or (M.sup.III).sub.2 O.sub.3, in which M.sup.I is an alkali metal atom, ammonium or a hydrogen atom, M.sup.II is an alkaline earth metal atom and M.sup.III is a rare earth metal of atomic number 57 to 71 in the periodic table of the elements, and x is a number from 4 to 4000, with the proviso that at least 50% of the negative lattice charges are compensated by protons, ammonium and/or the other metal ions mentioned under M.sup.II and M.sup.III, and the pores of which are formed from at least 10 tetrahedral atoms.