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CAS RN: 632-69-9 | Product Number: R0041

Acid Red 94

  • Rose Bengal
4   ≥20 

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Product Number R0041
Molecular Formula / Molecular Weight C__2__0H__2Cl__4I__4Na__2O__5 = 1017.63  
Physical State (20 deg.C) Solid
Condition to Avoid Light Sensitive
CAS RN 632-69-9
Reaxys Registry Number 3645857
PubChem Substance ID 87575611
Colour Index 45440
MDL Number


Appearance Dark red to Brown powder to crystal
Lambda max. 547.0 to 551.0 nm(0.02mol/L AcONH4 sol.)
Absorbance(E1%1cm) min. 900(0.02mol/L AcONH4 sol., 547.0 to 551.0 nm)
Properties (reference)
Maximum Absorption Wavelength 549(0.02mol/L AcONH4 sol.) nm
Related Laws:
EC Number 211-183-3
RTECS# LM5920000
Transport Information:
HS Number 3204120090
Reagent for thrombosis model


A One-Pot Transformation of Furans to Nitrogen-Bearing Aromatic Polycycles Initiated by Singlet Oxygen


Typical Procedure (R1=CH3, R2=R3=H): 2-Methylfuran (82.1mg, 1.0 mmol) is dissolved in methanol (6 mL) containing rose Bengal (102 mg, 0.1 mmol). The solution is cooled with an ice bath. Oxygen gas is gently bubbled through the solutions while it is irradiated with a xenon Variac Eimac Cermax 300 W lamp. After completion of the reaction (usually 8 min), methyl sulfide (249 mg, 4.0 mmol) is added for the reduction of the hydroperoxy group. After completion of the reduction (1 h), homoveratrylamine [D0678] is added (145 mg, 0.8 mmol) and the mixture is stirred for 30 min at room temperature. After the formation of the intermediate 2-pyrrolidinone, methanol is replaced by CH2Cl2 (4 mL). TFA (91.2 mg, 0.8 mmol) is added in CH2Cl2 (2 mL) and the mixture was stirred for 6 more hours at room temperature. After concentration of the solution, the product is purified by silica gel flash column chromatography (eluent: petroleum ether:EtOAc = 1:1) to give the desired aromatic tricyclic product (125 mg, 60%).


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