Weitkamp Robin F, Neumann Beate, Stammler Hans-Georg, Hoge Berthold
Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany.
Chemistry. 2021 Apr 12;27(21):6460-6464. doi: 10.1002/chem.202003504. Epub 2020 Nov 3.
The reaction of the strong monophosphazene base with the weakly acidic phenol leads to the formation of a phenol-phenolate anion with a moderately strong hydrogen bond. Application of the more powerful tetraphosphazene base (Schwesinger base) renders the isolation of the corresponding salt with a free phenolate anion possible. This compound represents the first species featuring the free phenolate anion [H C -O] . The deprotonation of phenol derivatives with tetraphosphazene bases represents a great way for the clean preparation of salts featuring free phenolate anions and in addition allows the selective syntheses of hydrogen bonded phenol-phenolate salts. This work presents a phosphazenium phenolate salt with a redox potential of -0.72 V and its capability for the selective activation of the chemically inert greenhouse gas SF . The performed two-electron reduction of SF leads to phosphazenium pentafluorosulfanide ([SF ] ) and fluoride salts.
强单磷腈碱与弱酸性苯酚反应生成具有中等强度氢键的苯酚 - 酚盐阴离子。使用更强的四磷腈碱（施韦辛格碱）使得分离出带有游离酚盐阴离子的相应盐成为可能。该化合物是首个具有游离酚盐阴离子[H C -O]的物种。用四磷腈碱使酚衍生物去质子化是一种用于纯净制备带有游离酚盐阴离子盐的好方法，此外还能选择性合成氢键连接的苯酚 - 酚盐盐。这项工作展示了一种氧化还原电位为 -0.72 V的磷鎓酚盐及其对化学惰性温室气体SF进行选择性活化的能力。对SF进行的双电子还原生成了五氟硫磷鎓盐([SF ] )和氟化物盐。
