Synthesis and investigation of the configurational stability of some dimethylammonium borate salts
作者:Stuart Green、Adam Nelson、Stuart Warriner、Benjamin Whittaker
DOI:10.1039/b005954o
日期:——
Two borate salts, dimethylammonium bis[3-isopropylbenzene-1,2-diolato(2−)-O,O′]borate and dimethylammonium 3,3′′-ethylenebis(3′-methylbiphenyl-2,2′-diolato(2−)-O,O′)borate, were synthesised from the corresponding catechol and tetraphenol respectively. The configurational stability of these salts was determined by variable temperature 1H NMR spectroscopy; the activation energies for the racemisation process were determined to be 85 and 79 kJ mol−1 respectively. Mechanisms are proposed to explain the configurational instability observed.
合成了两种硼酸盐,二甲基铵双[3-异丙基苯-1,2-二醇ato(2−)-O,O′]硼酸盐和二甲基铵3,3′′-乙烯基双(3′-甲基联苯-2,2′-二醇ato(2−)-O,O′)硼酸盐,分别来自相应的儿茶醇和四苯醇。这些盐的构象稳定性通过可变温度 1H NMR 谱学方法进行了测定;其拉伸化过程的活化能分别为 85 和 79 kJ mol−1。提出了机制以解释观察到的构象不稳定性。