Bicyclic guanidine superbase carboxylate salts for cellulose dissolution

Eva Gazagnaire, Jussi Helminen, Alistair W.T. King, Thomas Golin Almeida, Theo Kurten, Ilkka Kilpeläinen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review


Bicyclic guanidines are utilized in organic synthesis as base catalysts or reagents. They also offer a platform for coordination chemistry, for example in CO2 activation, and their carboxylate salts offer an efficient media for cellulose dissolution. We have studied a series of bicyclic guanidines with varying ring sizes and with varying methyl substituents with a specific aim to find hydrolytically stable acetate salts for dissolution and processing of cellulose. Different superbase synthesis pathways were tested, followed by hydrolytic stability and cellulose dissolution capacity tests. The synthesis pathways were designed to enable the scale up of the production of the superbases considering the availability of the starting molecules and the feasibility of the synthesis. As a result, we found several hydrolytically stable bicyclic guanidine structures, which can overcome many of the reoccurring problems as carboxylate salts or free bases.

Original languageEnglish
Pages (from-to)12119-12124
Number of pages6
JournalRSC Advances
Issue number17
Publication statusPublished - 16 Apr 2024
MoE publication typeA1 Journal article-refereed


The authors acknowledge the GRETE project (No. 837527 - GRETE - H2020-BBI-JTI-2018) and Academy of Finland (No. 1325369 and No. 1346369) for their financial support.


Dive into the research topics of 'Bicyclic guanidine superbase carboxylate salts for cellulose dissolution'. Together they form a unique fingerprint.

Cite this