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 Gas chromatography of alkyl halides on a silicone oil capillary column, published in 1975, which mentions a compound: 616-14-8, Name is 1-Iodo-2-methylbutane, Molecular C5H11I, Name: 1-Iodo-2-methylbutane.
RX (R = C3H7, C4H9, and C5H11; X = Cl-, Br-, and I-) isomers were separated and identified by gas chromatog. on a capillary column containing silicone fluid MS 550 at 20° with N carrier gas and a flame ionization detector. The straight-chain secondary hexyl, heptyl, and octyl halide isomers were similarly separated at 20-80°. The technique was used to analyze quant. 27 com. available secondary alkyl halides for their isomeric composition
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Reference:
Thiomorpholine – Wikipedia,
Thiomorpholine | C4H9NS – PubChem