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In the present study, the synthesis of oxygen-containing quaternary phosphonium salts (oxy-QPSs) was described. Within this work, structure-property relationships of oxy-QPSs were estimated by systematic analysis of physical-chemical properties. The influence of the oxygen-containing substituent was examined by comparing the properties of oxy-QPSs in homology series as well as with phosphonium analog-included alkyl side chains. The crystal structure analysis showed that the oxygen introduction influences the conformation of the side chain of the oxy-QPS. It was found that oxy-QPSs, using an aprotic co-solvent, dimethylsulfoxide (DMSO), can dissolve microcrystalline cellulose. The cellulose dissolution in oxy-QPSs appeared to be dependent on the functional group in the cation and anion nature. For the selected conditions, dissolution of up to 5 wt% of cellulose was observed. The antimicrobial activity of oxy-QPSs under study was expected to be low. The biocompatibility of oxy-QPSs with fermentative microbes was tested on non-pathogenic Saccharomyces cerevisiae , Lactobacillus plantarum , and Bacillus subtilis . This reliably allows one to safely address the combined biomass destruction and enzyme hydrolysis processes in one pot.

Herein, the synthesis of ferrocene-containing salts is presented. Acylation of ferrocene (Fc) according to the Friedel-Crafts method led to ω-bromoacyl ferrocenes. The ω-bromoacyl ferrocenes were subsequently introduced to quaternization reaction with tri- tert -butyl phosphine, which resulted in phosphonium salts. Obtained phosphonium salts were characterized by physical methods. The electrochemical properties of phosphonium salts were studied by cyclic voltammetry (CV). It was found that the replacement of n -butyl fragments at the phosphorus atom by tert -butyl leads to a more anodic potential shift. In contrast to isolobal structures Fc-C(O)(CH 2 ) n P + ( n -Bu) 3 X - and Fc-(CH 2 ) n+1 P + ( n -Bu) 3 X - , the CV curves of Fc-C(O)(CH 2 ) n P + ( t -Bu) 3 X - and Fc-(CH 2 ) n+1 P + ( t -Bu) 3 X - did not show a large discrepancy between forward and reverse currents. The transformation of the C=O groups to CH 2 fragments had a significant effect on the electrochemical properties of ferrocene salts, the oxidation potential of which is close to that of pure ferrocene.