摘要:
Process for removing hydrogen cyanide from ethanedinitrile by contacting hydrogen cyanide-containing ethanedinitrile with an organic reagent under formation of a covalent bond.
摘要:
The invention relates to β-alanine amides of general formula (I), wherein: R1 represents hydrogen or C¿1-6? alkyl that is optionally substituted by hydroxy, amino, carboxy, carbamoyl, methylmercapto, guanidino, optionally substituted aryl or heteroaryl, and; R?2¿ represents hydrogen or R?1 and R2¿, together, form a group of formula -(CH¿2?)n-, wherein n is 3 or 4. Said β-alanine amides are produced without using an amino protective group by reacting the corresponding amine with a cyanoacetic ester in order to form an acetamide and by effecting a subsequent catalytic hydrogenation. The method is suited, in particular, for producing carcinine (β-alanyl-histamine, R?1 ¿= imidazol-4-ylmethyl, R2 = H), a naturally occurring pseudo dipeptide, which is used as an active ingredient having an antioxidative effect in medicaments and cosmetics.
摘要:
The invention relates to a method for producing α-dicarbonyl compounds of formula (I), wherein R?1 and R2¿, independently of each other, mean C¿1-6?-alkyl. Said method is characterised in that an α,ß-unsaturated ketone of formula (II), wherein R?1 and R2¿ have the meaning above and R?3 and R4¿, independently of each other, mean hydrogen, C¿1-6?-alkyl or di-C1-6-alkylamino, is reacted with ozone and the resulting ozonide is treated reductively.
摘要:
The invention relates to a method for producing cyanoacetic acid esters of general formula (I), wherein R represents an optionally substituted linear or branched C1-8 alkyl group or an aryl C1-4 alkyl group. According to said method, an alkoxy propionitrile of general formula (II), wherein R is defined as above, is oxidised to form the desired product in the presence of a catalyst, based on lead or on one of the transition metals, using oxygen or an oxygen-forming reagent.
摘要:
The invention relates to prepolymer compositions on the basis of Novolac cyanates of the general formula (I), wherein n is a number of from 0 to 20 and the groups R are the same or different and represent hydrogen or methyl. The inventive compositions contain: 30 to 90 parts by weight of a prepolymer from Novolac cyanates (I) wherein R = hydrogen (Ia) and 10 to 70 parts by weight of Novolac cyanates (I) wherein R = methyl (Ib), and optionally highly dispersible silicon dioxides and/or particulate or fibrous fillers. The inventive compositions are solid at normal temperature and can be ground to flowable powders. They have an excellent stability when stored and are easy to process and especially suitable for use as the resin component in base materials for printed circuits and resin-bound abrasive products.
摘要:
The invention relates to a method for producing N -alkoxy- N -alkylamides of general formula (I), wherein R represents C1-10 alkyl, cyclo-C5-7 alkyl, cyclo-C5-7 alkenyl, C2-10 alkenyl, aryl, aryl C1-3 alkyl, heteroaryl, heteroaryl C1-3 alkyl or heterocyclyl; and R2 represents C1-6 alkyl. The inventive compounds are characterized in that an ester of general formula (II): R COOR , wherein R has the above-mentioned meaning, and R represents C1-6 alkyl, 4-nitrophenyl, 2,4-dinitrophenyl, succinimido or benzotriazole-1-yl, is reacted with hydroxylamine, a hydroxylamine derivative or with a hydroxylammonium salt, and the reaction product is alkylated in the presence of a phase transfer catalyst.
摘要:
The invention relates to novel acetoacetylated diamines and polyamines and to a method for the production thereof. The acetoacetylated diamines and polyamines are compounds of formula (I), wherein R?1 and R2¿, independent of one another, represent hydrogen or C¿1-6? alkyl, and A represents C3-8 cycloalkanediyl or a group of formula (II): -(CR?3R4)¿p-[NR-(CR5R6)q]r .
摘要:
The invention relates to a method for the production of 6,6,6-trihalo-3,5-dioxohexanic acid esters of formula (I) in addition to the enols thereof and E and Z isomers, wherein X independently represents fluorine, chlorine or bromine and R1 represents alkyl, cycloalkyl, aryl or aralkyl. The invention also relates to a method for the production of enol ethers of formula (Ib) and the enols thereof (E and Z isomers) wherein X and R1 have the above-mentioned meaning.
摘要:
Novel acetoacetylated aromatic amine compounds are claimed. - Novel acetoacetylated aromatic amine compounds (I) are of formula (1). - R1, R2 = OH, 1-6C alkyl, 1-6C alkoxy, halogen, phenyl or phenoxy; - R3 = H or 1-6C alkyl; - m = 0-4; - n = 0-5. - Independent claims are included for: - (i) a process for the production of the compounds (I) (R3=1-6C alkyl) by reaction of diketene with an N-phenyl-p-phenylenediamine of formula (2) in the presence of 3-40 % acetic acid at 20-100 (60-70) degreesC; - (ii) new unsaturated amino-ketone compounds (II) of formula (3) prepared by reaction of the amine compound (I) with ammonia; and - (iii) new amino-ketone compounds (III) of formula (4) prepared by catalytic hydrogenation of (II).