Bismark Brown R
Structural Formula Vector Image
Title: Bismark Brown R
CAS Registry Number: 8005-78-5
CAS Name: 4,4¢-[(4-Methyl-1,3-phenylene)bis(azo)]bis[6-methyl-1,3-benzenediamine] dihydrochloride
Additional Names: C.I. Basic Brown 4; 5,5¢-[(4-methyl-m-phenylene)bis(azo)]bis[toluene-2,4-diamine] dihydrochloride; C.I. 21010; Bismark Brown 53
Trademarks: Vesuvine
Molecular Formula: C21H26Cl2N8
Molecular Weight: 461.39
Percent Composition: C 54.67%, H 5.68%, Cl 15.37%, N 24.29%
Literature References: Prepd by reaction of toluene-2,4-diamine HCl with nitrous acid: Colour Index vol. 4 (3rd ed., 1971) p 4154.
Properties: Dark brown solid. Very sol in water (yellowish-brown soln); sol in ethanol, Cellosolve; slightly sol in acetone; practically insol in benzene. In concd H2SO4 gives brown soln which on dilution turns reddish-brown; in concd HNO3 gives violet soln which turns brown.
Derivative Type: Free base
Additional Names: C.I. Solvent Brown 12; C.I. 21010:1
Molecular Formula: C21H24N8
Molecular Weight: 388.47
Percent Composition: C 64.93%, H 6.23%, N 28.84%
Properties: mp 130-135°. Very slightly sol in water; sol in ethanol, acetone.
Melting point: mp 130-135°
Use: As textile dye, leather dye, biological stain.

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