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 Viscosity of liquid bromoalkanes at ambient pressure from 253.15 to 423.15 K: New experimental data and their free volume theory-based interpretation, published in 2020-11-01, which mentions a compound: 693-67-4, Name is 1-Bromoundecane, Molecular C11H23Br, HPLC of Formula: 693-67-4.
This work reports new exptl. data for the viscosity of 1-bromopenthane (within the temperature range (253.15-298.15) K), 1-bromohexane ((263.15-293.15) K), 1-bromoheptane ((263.15-298.15) K), 1-bromooctane ((253.15-293.15) K), 1-bromononane ((253.15-413.15) K), 1-bromodecane ((253.15-423.15) K), 1-bromoundecane ((283.15-423.15) K), 1-bromododecane ((273.15-293.15) K), and 1-bromohexadecane ((298.15-423.15) K). Considering them in combination with previously known data for these substances, it is shown that the viscosity of this series of 1-bromoalkanes accurately satisfies the Bingham-Coombs model based on the free volume approach. The quant. connection of the excluded volume with the van der Waals volume and the packing fraction is revealed.
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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem