127892-69-7Relevant academic research and scientific papers
Polyamides and polyesters containing 2,4:3,5-di-O-methylene-L-idaroyl residues
Tinnemans, A. H. A.,Budding, H. A.,Stein, F.,Venekamp, J. C.
, p. 181 - 186 (2007/10/02)
Electrochemical oxidation of 2,4:3,5-di-O-methylene-D-gluconic acid in strong alkaline medium afforded a mixture of 2,4:3,5-di-O-methylene-D-glucaric acid 4 and 2,4:3,5-di-O-methylene-L-idaric acid 1 in a 1/8 ratio with a current efficiency of 53percent.Force-field calculations using Allinger's molecular mechanics program MM2p85 on 1 and 4 indicate that these cis-fused tetrahydro-dioxino-1,3-dioxin ring systems possess an O-inside conformation with a steric energy of 110.3 and 123.5 kJ*mol-1, respectively.Their conformation was confirmed by 400-MHz 1H- and 100-MHz 13C NMR measurements.A series of polycondensates were prepared by homogeneous solution polymerisation of 1 with an aromatic diol or aromatic diamine, which were analyzed by DSC and TGA.
