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 Radiometric determination of the solubility of rubidium perchlorate by the nonisotopic-indicator method, published in 1959, which mentions a compound: 542-58-5, Name is 2-Chloroethyl acetate, Molecular C4H7ClO2, Application In Synthesis of 2-Chloroethyl acetate.
The solubility of RbClO4 in water and EtOH is determined by means of Cs134, which coprecipitates isomorphously with RbClO4. Solutions of RbCl containing, per ml., 0.2 γ of Cs+ and 5, 10, or 20 mg. of Rb+ were prepared, and to 1 ml. of each was added 2 ml. of a 10% aqueous HClO4 solution or a 10% solution of NaClO4 in 96% EtOH. After 1 hr. the precipitate were centrifuged off, and the activity of the centrifugate measured. A definite volume of centrifugate was added to the precipitate, and the mixture heated on a water bath to dissolve all or most of the precipitate, and the solution cooled. After 1 hr. the precipitate was separated and the amount of coprecipitated Cs determined The activity of the mother liquor was practically the same as before; this showed the isomorphous nature of the coprecipitation of Cs with RbClO4; however, the Cs was not completely precipitated, and this was allowed for in determining the solubility of RbClO4. The precipitate of RbClO4 obtained from solution containing Cs and Rb in the ratios 1:25,000, 1:50,000, and 1:100,000 were washed with H2O and EtOH until the wash liquor reached a constant activity, and then stirred with the solvent at 15° until saturation was reached. The solubility of RbClO4 in water is 4.35 ± 0.09 × 10-2M, and in EtOH 4.35 ± 0.06 × 10-3M.
In addition to the literature in the link below, there is a lot of literature about this compound(2-Chloroethyl acetate)Application In Synthesis of 2-Chloroethyl acetate, illustrating the importance and wide applicability of this compound(542-58-5).