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 Novel Class of Tertiary Phosphine Ligands Based on a Phospha-adamantane Framework and Use in the Suzuki Cross-Coupling Reactions of Aryl Halides under Mild Conditions, published in 2003-03-20, which mentions a compound: 97739-46-3, Name is 1,3,5,7-Tetramethyl-6-phenyl-2,4,8-trioxa-6-phosphaadamantane, Molecular C16H21O3P, HPLC of Formula: 97739-46-3.
Arylation or alkylation of the 1,3,5,7-tetramethyl-2,4,6-trioxa-8-phospha-adamantane allows for the preparation of sterically hindered tertiary phospha-adamantane phosphines I (R = Ph, 2-MeC6H4, n-C14H29), suitable for use in palladium-catalyzed cross-coupling reactions. For example, use of a catalytic system incorporating Pd2(dba)3 and I (R = Ph) promoted the Suzuki cross-coupling of aryl iodides, bromides, and activated chlorides with a variety of arylboronic acids at room temperature in a few hours with high yields.
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Reference:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics