In 2022,Jiang, Xiao; Tian, Zhongjian; Ji, Xingxiang; Ma, Hao; Yang, Guihua; He, Ming; Dai, Lin; Xu, Ting; Si, Chuanling published an article in International Journal of Biological Macromolecules. The title of the article was 《Alkylation modification for lignin color reduction and molecular weight adjustment》.COA of Formula: C6H12Br2 The author mentioned the following in the article:
The application of industrial kraft lignin is limited by its low mol. weight, dark color, and low solubility In this work, an efficient crosslinking reaction with N,N-Dimethylformamide (DMF) and 1,6-dibromohexane was proposed for adjusting the mol. weight and color of lignin. The chem. structure of alkylation lignin was systematically investigated by gel permeation chromatog. (GPC), UV spectroscopy, Fourier transform IR (FT-IR) spectroscopy, and 2D heteronuclear single quantum correlation NMR (HSQC NMR) spectra. After the alkylation modification, the mol. weights of the lignin were increased to 1643%. The resinol (β-β), β-aryl ether (β-O-4), and phenylcoumaran (β-5) linkages were still the main types of the linkages. The formation of β-β linkage would be inhibited at high temperatures The color reduction of lignin can be attributed to the low content of chromophores and low packing d. This alkylation lignin will be a new and general approach for developing mol. weight-controlled and light-colored lignins, which can find more applications in cosmetics, packing, and other fields. The experimental process involved the reaction of 1,6-Dibromohexane(cas: 629-03-8COA of Formula: C6H12Br2)
1,6-Dibromohexane(cas: 629-03-8) is generally used to introduce C6 spacer in the molecular architecture. Some of the examples are: synthesis of solvent processable and conductive polyfluorene ionomers for alkaline fuel cell applications; synthesis of cross-linkable regioregular poly(3-(5-hexenyl)thiophene) (P3HNT) for stabilizing the film morphology in polymer photovoltaic cells.COA of Formula: C6H12Br2
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary