Multistep degradation method for beta-O-4 linkage in lignins: gamma-TTSA method. Part 2: reaction of lignin model polymer (DHP)

作者：Ando Daisuke^*; Nakatsubo Fumiaki; Takano Toshiyuki; Nishimura Hiroshi; Katahira Masato; Yano Hiroyuki

来源：Holzforschung, 2013, 67(3): 249-256.

DOI：10.1515/hf-2012-0082

• cleavage of beta-O-4 linkages
• FT-IR
• gamma-TTSA method
• HSQC NMR
• LCC
• lignin
• lignin degradation method
• lignin polymer model (DHP)

A selective cleavage method for beta-O-4 linkages (the gamma-TTSA method) was introduced in previous works, which consists of four reaction steps: (1) gamma-tosylation, (2) thioetherification, (3) sulfonylation, and (4) mild alkali degradation. This method was applied to the degradation of a lignin polymer model (dehydrogenation polymer, DHP) consisting of guaiacyl units. Each reaction step was followed by Fourier transform infrared (FT-IR) spectroscopy and heteronuclear single quantum coherence nuclear magnetic resonance (HSQC-NMR) spectroscopy. It was demonstrated that only the beta-O-4 linkage was selectively cleaved by the gamma-TTSA method, although other linkages, such as beta-5 and beta-beta linkages, were also present in the DHP. Consequently, the gamma-TTSA method is expected to be also useful for the degradation of native lignins.

• 出版日期2013-4