Agnes Kütt

Solubilities of mono‐aminoacridines (AAs) in a variety of solvents were studied computationally using COSMO‐RS method and selectively confirmed by experiment (liquid chromatography and gravimetry). The results confirm the reliability of COSMO‐RS for ranking solvents on the basis of dissolving a specific AA, but not ranking the solubilities of different AAs in the same solvent. Pyrrolidine and some pyrrolidine‐based mixtures were predicted to deliver outstandingly high solubilities of AAs (10–30 % by mass, depending on the compound). Hydrogen bonding was found to have a considerable role in the solubility of AAs, which can act as hydrogen bond donors and acceptors. The obtained data and conclusions can facilitate solvent selection for purification of AAs, sample preparation for MALDI‐MS if an AA is used as a matrix, and can be helpful for solubility‐related applications involving other compounds.

A new group of bases with benzophenoneiminyl (bpi) moiety has been synthesized and characterized in this work. The title compound tris(benzophenoneimino)phosphane (P(bpi) 3 ) 1 was prepared with a convenient one‐pot approach: benzophenone imine was deprotonated using MeMgCl and reacted with PBr 3 in diglyme. The method could be considered as a method of choice for preparing other (amino)phosphanes in case lithio‐intermediates and/or protonated phosphane is out of consideration. Phosphane 1 is further used to prepare a range of related phosphonium cations and phosphazenes. Phosphonium cations were deprotonated to assess the stability of the resulting phosphonium ylides. In some cases, the bulky substances were capable of forming P−N heterocycles. Experimental (MeCN) and computational (MeCN, THF, gas‐phase) basicities of benzophenone imine, phosphane 1 , phosphonium ylides, and phosphazenes, as well as some representative XRD structures, are presented and discussed.