FIELD: chemistry.
SUBSTANCE: invention relates to method of obtaining 3,4'-diamino-4-R-benzhydrols of general formula . Where R1=Cl (1); R1=Br (2); R1=
(3), which are used as semi- products in synthesis of nitrogen dyes, consisting in simultaneous reduction of nitro- and carbonyl groups of respective dinitrobenzophenons of general formula
. Where: R1=Cl; R1=Br;
, reduction system Zn-NaBH4 in alcohol with mole substratum ratio: zinc: sodium tetrahydroborate equals 1:6:0.5.
EFFECT: reduction of synthesis cost, reduction of time and temperature of process carrying out, increase of target product output.
1 cl, 2 tbl, 3 ex
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Authors
Dates
2009-08-27—Published
2008-01-29—Filed