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 Diethyl acetals of α-formyl esters, published in 1947, which mentions a compound: 1001-26-9, Name is Ethyl 3-Ethoxy-2-Propenoate, Molecular C7H12O3, Electric Literature of C7H12O3.
Zn (100 g., washed with dilute HCl and 3 times with H2O, MeOH, and Me2CO, dried at 100°/20 mm. for 10 min., and used immediately), 25 cc. C6H6, and a crystal of iodine, heated to reflux, and treated dropwise (about 45 min.) with 0.2 mol. of the α-Br ester and 40 cc. (0.24 mol.) HC(OEt)3 in 75 cc. dry C6H6, 25 g. Zn added, and the mixture refluxed 6 hrs., give the di-Et acetals of α-formyl Et esters: propionate, b20 99-102°, 44%; butyrate, b20 112-17°, 51%; isobutyrate, b20 104-7°, 58.5%; valerate, b20 116-20°, 56.5%; caproate, b20 132-6°, 46.5%; hexahydrobenzoate, b20 149-52°, 52.5%. The product from BrCH2CO2Et contains 39% EtOCH:CHCO2Et. NCCHBrCO2Et gives 37% EtOCH:C(CN)CO2Et, m. 49-50°. The acetal esters and 2,4-(O2N)2C6H3NHNH2 in 20% aqueous H2SO4 give 2,4-dinitrophenylhydrazones of α-formyl Et esters: propionate, m. 110-11.5°; butyrate, m. 106-8°; isobutyrate, m. 104.5-5°; valerate, m. 121-3°; caproate, m. 86.5-8°; hexahydrobenzoate, m. 150-2°. Hexahydrobenzaldehyde 2,4-dinitrophenylhydrazone, yellow m. 168-9°.
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Reference:
Bromide – Wikipedia,
bromide – Wiktionary