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 Conversion of diphenylmethane diisocyanate to poly(carbodiimide) during catalysis by phospholene derivatives, published in 1975, which mentions a compound: 707-61-9, Name is 4-Methyl-1-phenyl-2,3-dihydro-1H-phosphole 1-oxide, Molecular C11H13OP, SDS of cas: 707-61-9.
Activity of phospholene derivatives as catalysts for polymerization of diphenylmethane diisocyanate (I) [26447-40-5] increased with increasing electron-donor activity of the substituent on the P atom of the catalyst. Kinetics data showed a dependence of the catalytic activity of phospholene derivatives on their structure, and the highest activity showed oxides of tertiary phosphines, whereas introduction of O and Cl in the ester radical decreased the polymerization rate. A nucleophilic character of the catalyst in the formation of carbodiimide-containing polymers was suggested. The highest polymerization rate of I was observed in the presence of 1-oxo-1-ethyl-3-methyl-2-phospholene (II) [56255-62-0], 1-oxo-1,3-dimethyl-3-phospholene [15450-79-0] and 1-oxo-3-methyl-1-phenyl-2-phospholene [707-61-9] as catalysts. A combined addition of I and 1-oxo-1-ethoxy-3-methyl-3-phospholene [697-31-4] had an additive catalytic effect on polymerization rate of I.
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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem