“…As we know, ether linkages can be efficiently cleaved with Lewis acid catalysts. 12,[32][33][34][35][36][37] However, guaiacol could not be effectively obtained from lignin using weak Lewis acid catalysts, such as La(NO 3 ) 3 , Al(OTf) 3 and LaCl 3 ( Table 1, entries 2-4). Unlike the above acids, the triate salts with stronger Lewis acidity could effectively catalyze the production of guaiacol from lignin with various yields (Table 1, entries 5-8 and Fig.…”