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2 365 578

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IPC

C07C209/36(2006-01-01)

C07C217/90(2006-01-01)

C07C215/68(2006-01-01)

(21) (22)

Application

2008103384/04, 2008-01-29

(24)

Start date

2008-01-29

(22)

Actual filing date

2008-01-29

(45)

Published

2009-08-27

(72)

Inventor

Begunov Roman SergeevichBrodskij Igor' Igorevich

(73)

Holder

Gosudarstvennoe Obrazovatel'Noe Uchrezhdenie Vysshego Professional'Nogo Obrazovanija Jaroslavskij Gosudarstvennyj Universitet Im. P.G. Demidova

METHOD OF OBTAINING 3, 4'-DIAMINO-4-R-BENZHYDROLS Russian patent published in 2009 - IPC C07C209/36 C07C217/90 C07C215/68

Abstract RU 2365578 C1

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-NaBH₄in 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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RU 2 365 578 C1

Authors

Begunov Roman Sergeevich

Brodskij Igor' Igorevich

Dates

2009-08-27—Published

2008-01-29—Filed