reaction with 4-hydroxy-pyrone/-benzopyrone afforded substituted benzofuran regioisomers whose structures with only two aromatic protons in total prevent a rapid structuralassignment. Based on the evaluation of 1H–13C long-range couplingconstants a rule of thumb could be deduced for an easy and unambiguous differentiation between the possible regioisomers formed. DFT frontier orbital calculations of the
漆酶催化的取代邻苯二酚的氧化,然后与 4-羟基吡喃酮对苯并吡喃酮取代 苯并呋喃区域异构体的结构总共只有两个芳香族质子,阻止了快速的结构分配。根据对1 H – 13 C远程耦合常数的评估,可以推断出经验法则,可以轻松而明确地区分可能形成的区域异构体。反应物的DFT前沿轨道计算提供了一个有趣的工具来解释关键反应的区域选择性。