2-((S)-Dec-1-yn-5-yloxy)tetrahydro-2H-pyran, also known as 2-((S)-Dec-1-yn-5-yloxy)tetrahydro-2H-pyran, is a heterocyclic compound with a five-membered ring containing one oxygen atom and one double bond. It is a versatile building block for synthesizing various organic compounds and has been used in a wide range of scientific research applications. It could be used to synthesis 3-methoxy-2-(2-propenyl)-α-[(5S)-5-[(tetrahydro-2H-pyran-2-yl)oxy]-1-decynyl]benzenemethanol.