The relative rates for interconversion and reprotonation of the ion-pair intermediates are of the same order of magnitude in the piperidine catalyzed ‘degenerate’ rearrangement of 1,3-dimethylindene, as investigated using 1H and 2H NMR spectroscopy by letting the 1,3-hydron transfer reaction compete with isotope (1H/2H) exchange.
                                    在
哌啶催化下,1,3-二甲基
茚的“退化”重排中,离子对中间体的相互转化和重质化速率具有相同的数量级,这是通过让1,3-氢转移反应与同位素(1H/2H)交换竞争,利用1H和2H NMR光谱研究得出的结果。