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 Diphosphorus tetraiodide (P2I4). A valuable reagent for regioselective synthesis of iodo alkanes from alcohols, published in 1979-05-31, which mentions a compound: 616-14-8, Name is 1-Iodo-2-methylbutane, Molecular C5H11I, HPLC of Formula: 616-14-8.
Primary, secondary, and tertiary alkanols and phenylalkanols and secondary and tertiary cycloalkanols were converted in high yields to the resp. alkyl, phenylalkyl, and cycloalkyl iodides by P2I4 in CS2 and at 20°. E.g., ROH [R = Me(CH2)7, Ph(CH2)2, cyclopentyl] gave 80-8% RI in 24 h.
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Reference:
Thiomorpholine – Wikipedia,
Thiomorpholine | C4H9NS – PubChem