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Basic Red 18, also known as Rhodamine B, is a synthetic dye. Its synthesis involves several steps, and the exact reagents used may vary depending on the specific method. However, common reagents include:
Phthalic anhydride: This is a key component for creating the xanthene ring system.
N,N-Diethylaniline: This provides the amino groups and the aromatic structure.
Zinc chloride: This is a catalyst to promote the reaction.
Sodium hydroxide: This is used for neutralization and for the final step of dye formation.
The specific reaction conditions (temperature, time, etc.) also affect the yield and purity of the final product.