4575. Guinea Green B

Nomenclature

CAS number: 4680-78-8
N-Ethyl-N-[4-[[4-[ethyl[(3-sulfophenyl)methyl]amino]phenyl]phenylmethylene]-2,5-cyclohexadien-1-ylidene]-3-sulfobenzenemethanaminium inner salt, sodium salt; C.I. Acid Green 3; C.I. Food Green 1; FD & C Green 1; C.I. 42085.
C37H35N2NaO6S2; mol wt 690.80.
C 64.33%, H 5.11%, N 4.06%, Na 3.33%, O 13.90%, S 9.28%.

Description and references

Prepn: Jones et al., J. Assoc. Off. Agric. Chem. 38, 977 (1955). Toxicity studies: F. C. Lu, A. Lavalle, Can. Pharm. J. 97, 30 (1964); W. H. Hansen et al., Food Cosmet. Toxicol. 4, 389 (1966). See also: Colour Index vol. 4 (3rd ed., 1971) p 4385.

Chemical structure

Properties

A dull, dark green powder, or a bright, crystalline solid. Sol in water to a green soln which becomes brownish-yellow on addn of HCl and blackish-green with NaOH. An excess of NaOH decolorizes the soln. Sparingly sol in alcohol; it dissolves in concd H2SO4 to a yellow soln which, when diluted with water, turns first yellowish-red, then green. LD50 orally in rats: >2 g/kg (Lu, Lavalle).

Use

Limited use as a dye for silk and wool fabrics; as biological stain.