Synthesis and properties of hemifluorinated disodium alkanesulfonates

Synthesis of Cyclic Type Semi-Fluorinated Disodium Alkanesulfonate

“…10,12 In continuation of our efforts towards the synthesis of PFOS alternatives, we embarked on the design and synthesis of cyclic type semi-fluorinated disodium sulfonate, another fascinating target. As described earlier, it is evident that the introduction of bio-degradable perfluorobutyl group as hydrophobic chain in surfactant is our foremost priority.…”

“…12 In continuation, present work on assuming gemini structure and bio-degradable shorter fluoroalkyl chain to enable the development of alternatives, we designed the structure of novel sulfonic acid type gemini surfactant having cyclic-type semi-fluoroalkyl group as hydrophobic segment instead of linear fluoroalkyl chain, which is depicted in Sridhar Chirumarry, Yohan Ko, Kiwan Jang, and Dong-Soo Shin Fig. 1.…”

Mesomorphic properties of cyanobiphenyl dimers with a central malonate unit

“…Colourless solid (89 %, 1.99 g, 8.64 mmol); 1 H-NMR (300 MHz, CDCl 3 ): δ = 1.24-1.64 (m, 24H, 12 × CH 2 ), 3.64 (t, J = 6.6 Hz, 4H, 2 × OCH 2 ) ppm; 13 C-NMR (75 MHz, CDCl 3 ): δ = 25. 7,29.4,29.5,29.6,29.6 (10 × CH 2 ), 32.8 (2 × OCH 2 CH 2 ), 63.1 (2 × OCH 2 ) ppm.…”

“…was carried out with silica gel (particle diameter of 40 -63 µm) from the company Macherey-Nagel. 1 H-NMR spectra were recorded using Bruker Avance 300, Avance 400 and Avance 500 spectrometers at 300 MHz, 400 MHz and 500 MHz, respectively as well as 13 C-NMR spectra at 75 MHz, 100 MHz and 126 MHz, respectively. As a solvent, deuterated chloroform (CDCl 3 ) was used with tetramethylsilane as a reference for the chemical shift δ in ppm (parts per million).…”

“…Atom numbering can differ from the IUPAC nomenclature due to a better comparability of several compounds. 1 H-and 13 C-NMR spectra, COSY, HSQC and HMBC measurements were carried out to assign the NMR signals.…”