Establishing GC-MS Fingerprinting Thresholds to Quantify Trace 2,3,5- and 2,4,5- Isomer Impurities Above 0.3%
When evaluating 2,3,4-Trimethoxybenzaldehyde (CAS: 2103-57-3) for reductive amination, standard HPLC assays often mask structural isomers due to co-elution. GC-MS fingerprinting is mandatory to quantify 2,3,5- and 2,4,5- isomers. If these impurities exceed 0.3%, they act as irreversible poisons for palladium catalysts, significantly reducing turnover frequency. Ningbo Inno Pharmchem Co., Ltd. implements rigorous GC-MS protocols to ensure isomer profiles remain within acceptable
