The synthesis and characterization of a porphyrazine bearing aza-15-crown-5 moieties in the peripheral positions and its cobalt(II) complex was written by Kantekin, Halit;Celenk, Elif;Biyiklioglu, Zekeriya;Karadeniz, Huelya. And the article was included in Transition Metal Chemistry (Dordrecht, Netherlands) in 2008.Formula: C10H21NO4 This article mentions the following:
Novel metal-free and metalloporphyrazines I (H2Pz, MgPz, CoPz; M = 2H, Mg, Co, resp.; Q = 1,4,7,10-tetraoxa-13-azacyclopentadec-13-yl), peripherally substituted with eight aza-15-crown-5 moieties, were prepared by template reductive condensation of 2,3-[Q(CH2)3S]-maleodinitrile in the presence of met. Mg in n-PrOH, while MgPz (I, M = Mg) was obtained. Demetalation of MgPz by CF3CO2H gave metal-free porphyrazine H2Pz, which was reacted with CoCl2 to give CoPz (I, M = Co). The novel compounds were characterized by elemental anal., IR, 1H and 13C-NMR, UV-vis. spectra and MS data. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3Formula: 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. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.Formula: C10H21NO4
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem