56331-52-3

Upstream product

• 875-35-4 2,6-dichloro-4-methylnicotinonitrile 
• 5332-73-0 3-methoxypropylamine 
• 5444-02-0 3-cyano-4-methyl-6-hydroxypyrid-2-one 

Downstream Products

• 51560-72-6 2,6-bis-(3'-methoxy-n-propylamino)-3-cyano-4-methylpyridine 

Relevant academic research and scientific papers

Preparation method for nitrobenzisothiazole-pyridine dye with good acid-base stability

The invention discloses a preparation method for a nitrobenzisothiazole-pyridine dye with good acid-base stability. The preparation method comprises the following steps: (1) preparing a compound (i) from 1,4-dimethyl-3-cyano-6-hydroxy-2-pyridone and phosphorus oxychloride; (2) preparing a compound (ii) from the compound (i) and NH2-(CH2)n-O-CH3; (3) preparing a compound (A) from the compound (ii)and NH2-(CH2)n-O-CH3; (4) diazotizing 3-amino-5-nitrobenzoisothiazole by using sodium nitrite so as to obtain diazonium salt; (5) mixing the diazonium salt with the compound (A) for a reaction, and carrying out aging so as to obtain a crude product; and (6) dissolving the crude product, carrying out cooling extraction, and carrying out purifying so as to obtain a compound as shown in a structuralformula (B) which is described in the specification. According to the invention, the nitrobenzisothiazole-pyridine dye with good acid-base stability is synthesized in a functional group conversion mode; and the preparation method provided by the invention is easily-controllable in reaction conditions, simple in operation and high in product yield.

Reactive Azo Dyes, Methods for the Production Thereof and Their Use

Reactive dyes of the formula (1) where R1 to R5, Ar, n, Y and D are as defined in claims 1 and 2 are described, as are processes for preparing them, and their use for dyeing and printing carboxamido-, amino-, and hydroxyl-containing

Process of preparing diaminopyridine compounds

A process for preparing diaminopyridines of the formula STR1 where one of the two radicals X1 and X2 is hydrogen, C1 -C4 -alkyl, halogen or nitro and the other is cyano, R1 is hydrogen, C1 -C4 -alkyl or phenyl, R2 and R3 are each hydrogen, C1 -C4 -alkyl or C1 -C4 -alkoxy, R4 is hydrogen or C1 -C4 -alkyl, and R5 is optionally substituted C1 -C10 -alkyl, C3 -C4 -alkenyl or C5 -C7 -cycloalkyl, by reacting dichloropyridines of the formula STR2 in a first step with an amine of the formula R5 -NH2 at from 10° to 80° C. in the presence of a base and of an inert organic diluent and/or water, then removing the diluent and thereafter, with or without prior intermediate isolation of the reaction product, comprises carrying out the second step in a melt at from 90° to 165° C. and at a pH from 3.5 to 6.5 using from 1.3 to 3 mol of aniline IV are used per mole of dichloropyridine II.

2-Hydrocarbyloxy-pyridine compounds

Compounds of the formula SPC1 Wherein X is aliphatic, cycloaliphatic, aromatic, aralkyl, hetaryl, hetarylalkyl or hydrogen; Y is aliphatic, aromatic, aralkyl, --COOR1, --COR2, EQU1 --SO2 R2, EQU2 --CN, --NH2, --NO, --NO2 or hydrogen with the proviso that when Y is hydrogen, X is other than hydrogen; Z1 is cyano, EQU3 --NH--OR10, EQU4 --OR12, --SR12 or --SO2 R12 and Z2 is chlorine, bromine, cyano, hydroxy, mercapto, --OR12, --SR12, --SO2 R12, EQU5 --NH--OR10 or EQU6 R1 is aliphatic; R2 is aliphatic, cycloaliphatic, aromatic, aralkyl or heterocyclic; R3 and R4 when taken separately are hydrogen, aliphatic, cycloaliphatic, aromatic or aralkyl; R3 and R4 when taken together with the nitrogen atom to which they are attached form a heterocyclic moiety; R5 and R6 when taken separately are aliphatic, aromatic, aralkyl, heterocyclic or hydrogen; R5 and R6 when taken together with the nitrogen atom to which they are attached are heterocyclic; R7 is hydrogen, aliphatic or aromatic; R8 and R9 are aliphatic or aromatic, R10 is hydrogen, aliphatic or aralkyl, R11 is aliphatic and R12 is aliphatic, aromatic or aralkyl; R10 and R11 when taken together with the nitrogen atom to which they are attached are heterocyclic.