已经制备了双功能铜基光催化剂,其使用掺入磺酰胺部分的吡唑-吡啶配体,该磺酰胺部分用作光化学PCET工艺的分子内氢键供体。在典型的还原性PCET工艺中,光催化剂和H键供体必须分别具有适当的氧化还原电势和p K a,以促进PCET。当在双功能催化剂(例如Cu(pypzs)(BINAP)BF 4)中协同工作时,p K a氢键供体的一半酸度可以降低几个数量级,并且仍然可以有效地促进PCET过程。可以使用贱金属衍生的光催化剂进行频哪醇还原型偶联,以从易得的醛和酮中获得有价值的二醇(24个实例,收率46-99%)。
Electrolytic reductive coupling of hydroxybenzaldehydes
申请人:Monsanto Company
公开号:US04087336A1
公开(公告)日:1978-05-02
Electrolytic reductive coupling of hydroxybenzaldehydes in an aqueous alkaline electrolysis medium in an undivided electrolytic cell yields 1,2-bis(hydroxyphenyl)ethane-1,2-diols.
The coupling reaction of aromatic carbonyl compounds was performed with Sm-I-2 or Sm-I-2-Ti(O;Pr-i)(4) in methanol. Meso isomer was mainly produced in the presence of Ti(O(i)Pr)(4).
Law, Journal of the Chemical Society, 1906, vol. 89, p. 1514