3,4,5-Trimethoxybenzoic Acid
3,4,5-Trimethoxybenzoic Acid (CAS: 118-41-2), also known as eudesmic acid or trimethylgallic acid, is a white to off-white crystalline aromatic acid bearing three methoxy groups. It is a key intermediate for the synthesis of trimethoprim, the widely used antibacterial synergist, and for other pharmaceutical active ingredients. The carboxylic acid group supports esterification, amidation, and reduction chemistry, while the electron-rich ring enables further functionalization. The compound stores well as a dry crystalline powder with good thermal stability. Customers select it where a methoxylated aromatic acid building block with consistent quality is required.
• Trimethoprim intermediate: the key building block for the antibacterial synergist trimethoprim.
• Pharma synthesis: used in the production of drug actives and other methoxylated aromatics.
• Versatile reactivity: supports esterification, amidation, reduction, and ring functionalization chemistry.
• Handling: stable white crystalline powder stored in drums with plastic liners.
Product Name: 3,4,5-Trimethoxybenzoic Acid
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