Synthesis and crystal structure of new bis(azacrown ethers) on the basis of 1,2-bis(2,2,2-trichloro-1-isocyanatoethoxy)benzene was written by Luk’yanenko, Nickolay G.;Pastushok, Viktor N.;Lyapunov, Alexander Yu.;Onys’ko, Pyotr P.;Sinitsa, Anatoliy D.;Povolotskiy, Mark I.;Zubatyuk, Roman I.;Shiskhin, Oleg V.. And the article was included in Makrogeterotsikly in 2009.Computed Properties of C10H21NO4 This article mentions the following:
Synthesis, properties and X-Ray anal. of the new bis(azacrown ethers), containing bridging urea fragments are reported here. These substances have in their mol. structure both centers of anion linking (proton donating NH groups) and centers of cation linking (crown ether units) and thus may be considered as potential ion-pair receptors. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3Computed Properties of C10H21NO4).
1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3) belongs to ethers. Ether is less polar than esters, alcohols or amines because of the oxygen atom that is unable to participate in hydrogen bonding due to the presence of bulky alkyl groups on both sides of the oxygen atom. But ether is more polar than alkenes. Electron-deficient reagents are also stabilized by ethers. For example, borane (BH3) is a useful reagent for making alcohols. Pure borane exists as its dimer, diborane (B2H6), a toxic gas that is inconvenient and hazardous to use. Borane forms stable complexes with ethers, however, and it is often supplied and used as its liquid complex with tetrahydrofuran (THF).Computed Properties of C10H21NO4
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem