4-NITROSORESORCINOL synthesis
- Product Name:4-NITROSORESORCINOL
- CAS Number:698-31-7
- Molecular formula:C6H5NO3
- Molecular Weight:139.11
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Yield:698-31-7 75%
Reaction Conditions:
with sodium nitrite in water;
Steps:
21 Preparation of resorufin-4-carboxylic acid
Example 21
Preparation of resorufin-4-carboxylic acid
Sulfuric acid (conc. 3.5 mL) was added to a 500 mL flask containing 170 mL of water, which was then cooled to 4° C. in an ice bath.
Resorcinol (7.2 g, 65 mmol) was then added under stirring.
After 5 min, a sodium nitrite (5.4 g, 78 mmol) water solution was added slowly.
The temperature was kept around 5-8° C. for 30 min and then allowed to warm to 20° C. for another 30 min.
The reaction was diluted with 200 mL water, and the precipitated product was collected by suction filtration, washed with water, and dried by vacuum pump to give a yellow product (4-nitrosoresorcinol in 75% yield).
References:
US2013/53252,2013,A1 Location in patent:Page/Page column
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