1,3-Didodecylimidazolium salts have been prepared as first representatives of a new class of ionic liquid crystals (ILCs), showing thermotropic liquid crystalline behaviour in an extended temperature range below 70 degrees C. Remarkably strong non-Newtonian viscosity behaviour was found for the liquid-crystalline state of these ILCs.
Different types of cyclic phosphine oxides, such as tetrahydrophosphole oxide 1, phosphabicyclo[3.1.0]hexane 3oxide 8 and phosphabicyclo[2.2.1]heptene 7-oxides 10 and 12 were efficiently converted to phosphine-boranes 2, 9, 11 and 13, respectively, under relatively mild conditions by reaction with 4.4 equivalents of dimethyl sulfide-borane. The more strained hetero-ring the starting phosphine oxide (in general 16) has, the easier to accomplish the change in the P-function, that takes place through the corresponding phosphine intermediate ( 20). It is noteworthy that the imide carbonyl groups in starting materials 10 and 12 were fully reduced by the borane to give 11 and 13 respectively.
Watching phase transitions: Ordering processes and phase transitions in thin films of the liquid‐crystalline ionic liquid 1,3‐didodecylimidazolium tetrafluoroborate [C12C12IM][BF4] on Pt(111) (see picture) are studied by means of temperature‐dependent IR reflection absorption spectroscopy. The method allows in situ monitoring of the structural properties of liquid‐crystalline supported ionic liquid phase (SILP) catalysts under reaction conditions.
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