摘要: Publisher Summary This chapter discusses thioaldehydes and classifies them as transient stable. Transient or simple are so reactive have such short life-times that their reactions usually carried out with the generated in situ presence of trapping reagents. Most these cycloadditions (the Diels-Alder reaction 1,3-dipolar cycloaddition). In addition to chemical trapping, some can be detected by spectroscopic methods. Compounds having a thioformyl group highly unstable reactive. The thioamide, thioesters, vinylogous analogs known exist isolable, stable species result mesomeric effect decreases double bond nature C–S hence instability molecule. use bulky substituents enables isolation thioaldehydes. synthesis, structure, reactivity described this chapter.