28780-45-2

Basic information

• Product Name: α-hydro, ω-hydroxyheptacosa(oxyethylene)
• CAS NO: 28780-45-2
• Molecular Weight: 1207.45
• Mol File: 28780-45-2.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: α-hydro, ω-hydroxyheptacosa(oxyethylene)(CAS DataBase Reference)
• NIST Chemistry Reference: α-hydro, ω-hydroxyheptacosa(oxyethylene)(28780-45-2)
• EPA Substance Registry System: α-hydro, ω-hydroxyheptacosa(oxyethylene)(28780-45-2)

Safety Data

• Hazardous Substances Data: 28780-45-2(Hazardous Substances Data)

Upstream product

• 3386-18-3 nonaethylene glycol 
• 109635-64-5 Nonaethylene glycol ditosylate 

Relevant articles and documents

Preparation and crystallinity of a large unsubstituted crown ether, cyclic heptacosa(oxyethylene) (cyclo-E27, 81-crown-27), studied by Raman spectroscopy, X-ray scattering and differential scanning calorimetry

Cyclic heptacosa(oxyethyelene) (cyclo-E27, 81-crown-27) was prepared from linear α-hydro, ω-hydroxy-heptacosa(oxyethylene) by reaction with tosyl chloride under alkaline conditions, purified by preparative-scale gel permeation chromatography, and studied by laser-Raman spectroscopy, wide-angle and small-angle X-ray scattering, and differential scanning calorimetry. Comparison was made with the properties of linear oligo(oxyethylene) dimethyl ethers (including C1E27C1). The sub-cell of the crystalline cyclic oligomer was the same as that of its linear counterparts, i.e. the same as that of high-molar-mass poly(oxyethylene). However, the cyclic oligomer crystallised as a twice-folded ring, as confirmed by its long spacing and the frequency of its single-node longitudinal acoustic mode (LAM-1). Enthalpies of fusion and melting temperatures were analysed to provide estimates of the enthalpy and entropy of formation of a fold in an oligo(oxyethylene) layer crystal.