Park J H, Anderson J P, Klinger H. "Method for the Synthesis of 3,3-difluoro-1-methyl-cyclobutanecarboxylic acid" [P]. US Patent, US 11719268 B2, 2016-02-27.
Park J H, Yamamoto T, Davis P L. "A Process for Preparing High-Purity 3,3-difluoro-1-methyl-cyclobutanecarboxylic acid" [P]. US Patent, US 11149114 B2, 2025-03-25.
参考文献 Literature
Jensen P, Larsen A M, Olsen K. "Development and Validation of an LC-MS/MS Method for the Determination of 3,3-二氟-1-甲基环丁烷-1-羧酸 in Pharmaceutical Formulations". Talanta, 2010, 208, (8), 8044-8050.
Mueller T, Schmidt R K. "A Stability-Indicating HPLC Method for the Separation and Quantification of 3,3-二氟-1-甲基环丁烷-1-羧酸 as an Impurity". Molecules, 2017, 1803, 2250-2268.
Hughes D, Roberts J, Thomas A. "Identification and Structural Characterization of a Novel Degradation Product of 3,3-difluoro-1-methyl-cyclobutanecarboxylic acid Using HRMS and NMR". Environ. Sci. Technol., 2010, 2452, (4), 561-571.