For chemists and researchers, a deep understanding of a compound's chemical identity, properties, and analytical characteristics is fundamental. 2-(sec-Butyl)-4,5-dihydrothiazole (CAS: 56367-27-2) is a molecule with a specific structure and reactivity that dictates its behavior and applications, particularly as a pheromone in rodents.

This compound belongs to the dihydrothiazole class, characterized by a five-membered ring containing sulfur and nitrogen atoms, with a sec-butyl group attached at the 2-position. Its molecular formula is C7H13NS, and it has a molecular weight of approximately 143.25 g/mol. The presence of the sec-butyl group introduces chirality, meaning it can exist as different stereoisomers, which can be significant in biological interactions.

Key physical properties include a predicted density of 1.06 ± 0.1 g/cm³ and a boiling point of 193.0 ± 9.0 °C. Spectroscopic analysis provides crucial data for identification and quality control. ¹H NMR spectra reveal characteristic signals for the thiazoline ring protons and the sec-butyl moiety. ¹³C NMR further confirms the carbon framework, with the imine carbon typically appearing around 170 ppm. Mass spectrometry, particularly ESI-MS, yields a molecular ion peak at m/z 143.25, and fragmentation patterns help elucidate its structure.

The analysis of 2-(sec-Butyl)-4,5-dihydrothiazole is often performed using techniques like Gas Chromatography-Mass Spectrometry (GC-MS), especially when detecting it in complex biological matrices such as urine. High-Performance Liquid Chromatography (HPLC) coupled with appropriate detectors is also used for purity assessment and quantification.

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