In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Microwave induced synthesis of a new class of pyrano isoxazoline and isoxazole annulated chromones – an intramolecular nitrile oxide cycloaddition with tethered olefins and alkynes, published in 2020, which mentions a compound: 16400-32-1, Name is 1-Bromo-2-pentyne, Molecular C5H7Br, Synthetic Route of C5H7Br.
A variety of new highly substituted-tetracyclic pyrano isoxazoline/isoxazole annulated chromone derivatives I [R1 = H, Cl; R2 = H, Me, Ph; R3 = H, Me] and II [R4 = H, Me, Et] were synthesized via eco-friendly microwave assisted/ceric ammonium nitrate (CAN) as an oxidant, intramol. 1,3-dipolar cycloaddition with in situ generated nitrile oxides from aldoximes of alkene/alkyne tethered chromones. This protocol was practically simple and efficient to construct diverse range of substituted pyrano isoxazoline/isoxazole annulated chromone derivatives and gave higher yields of products in microwave irradiation compared to conventional heating. The structures of all the synthesized compounds were established by IR, NMR and mass spectral anal.
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Reference:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics