摘要:
The invention relates to compounds of formula (Ia) or (Ib). In said formulas, A represents an aliphatic, cycloaliphatic, araliphatic or aromatic radical of the value (n + 1) and n is a whole number from 0 to 5, E represents an aliphatic, cycloaliphatic, araliphatic or aromatic radical of the value (m + 1) and m is a whole number from 0 to 3, X stands for -O-, -COO-, or -CHR4-, whereby R4 and R3 together form an ethylene group, R1 and R2 independently of one another represent hydrogen or methyl, R3 represents hydrogen or R3 and R4 together form an ethylene group, and R5 represents a monovalent aliphatic, cycloaliphatic, araliphatic or aromatic radical. The inventive compounds are highly reactive hardening agents for epoxy resins and produce hardened products with improved chemical resistance.
摘要:
The invention relates to compounds of formula (I) provided in the form of racemates and enantiomers, preferably compounds of formula (Ia), wherein R4 represents C1-C6 alkyl; Z represents chlorine, bromine or iodine, and; X represents -OH, chloride, bromide or iodide, or X forms an ester group with the carbonyl remainder. The invention also relates to salts of the carboxylic acids. The compounds are valuable intermediate products for producing d-amino-g-hydroxy-w-aryl-alkane carboxylic acid amides which exhibit renin-inhibitive properties and which can be used as antihypertensive agents in pharmaceutical preparations.
摘要:
Curable epoxy resin compositions, which are obtainable by heating a composition containing at least one epoxy compound, which contains on average at least one, preferably more than one, 1,2-epoxy group and optionally also one or several hydroxyl groups in the molecule, in the presence of at least one Lewis acid as catalyst, wherein the Lewis acid is a salt of trifluoromethanesulfonic acid or of perchloric acid, the counterion of which carries a 2- to 6-fold positive charge, until the epoxy value, measured in equivalent epoxy/kg (Eq/kg) of the starting material, has been reduced by 1 to 60 percent, preferably by 5 to 50 percent; a process for their preparation, and their use for the preparation of fully cured moulded compositions or coatings. Claimed are, inter alia, also high molecular weight epoxy compounds of formula (IIa), wherein A is a divalent aliphatic or aromatic radical, B is the radical of the dioxan, which is substituted either in 2- and 5-position or in 2- and 6-position and which may be in the cis-or trans-form, and n is an integer from 1 to 10, preferably from 1 to 5.
摘要:
Compounds of formula (I), wherein R1 and R2 are, independently of one another, H,C1-C6alkyl, C1-C6halogenalkyl, C1-C6alkoxy, C1-C6alkoxy-C1-C6alkyl, or C1-C6alkoxy-C1-C6alkyloxy, and R3 is C1-C6alkyl, are obtainable in high yiedls by stereoselective addition of R3-substituted propionic acid esters to R1- and R2-substituted benzaldehydes of formula R-CHO to form corresponding 3-R-3-hydroxy-2-R3-propionic acid esters, conversion of the OH group to a leaving group, subsequent regioselective elimination to form 3-R-2-R3-propenic acid esters, and reduction to corresponding 3-R-2-R3-allyl alcohols and their enantioselective hydrogenation, wherein R is (a).
摘要:
Epoxyacrylate von postglycidylisierten Epoxyharzen sind relativ hochmolekular und photochemisch vernetzbar und können in Photoresistformulierungen ohne zusätzliche Verwendung von hochpolymeren Binderpolymeren eingesetzt werden. Derartige Resistformulierungen finden Verwendung vor allem auf dem Gebiet der Leiterplatten und Druckplatten, sind wässrig applizierbar, weisen praktisch keine Klebrigkeit auf und besitzen eine sehr gute Kantendeckung vor allem auf Leiterzügen.