C5H4OS

C5H4OS is the molecular formula for several chemical compounds. One notable compound with this formula is thiophene-2-carbaldehyde, also known as 2-thiophenecarboxaldehyde. This organic compound is a derivative of thiophene, a five-membered heterocyclic aromatic ring containing four carbon atoms and one sulfur atom. In thiophene-2-carbaldehyde, an aldehyde group (-CHO) is attached to the carbon atom at the second position of the thiophene ring.

Thiophene-2-carbaldehyde is typically a yellow to brown liquid with a characteristic odor. It is soluble in many organic solvents but has limited solubility in water. This compound finds use as an intermediate in the synthesis of various organic molecules, including pharmaceuticals, agrochemicals, and dyes. Its reactive aldehyde group allows for a range of chemical transformations, making it a versatile building block in organic chemistry. The thiophene ring itself imparts specific electronic and structural properties to molecules derived from it. Due to its utility in chemical synthesis, thiophene-2-carbaldehyde is a commercially available reagent. Other isomers with the molecular formula C5H4OS exist, but thiophene-2-carbaldehyde is the most commonly encountered.