N-dimethylamino)(3-methoxycarbonyl-2-methylphenyl)carbene]chromium(0) [(S)-6] and (R)-pentacarbonyl[(N,N-dimethylamino)(5-methoxycarbonyl-2-methylphenyl)carbene]chromium(0) [(R)-7], were prepared in enantiomerically pure form by the crystallization of diastereoisomeric esters with (S)-1-(1-naphthyl)ethanol. In the case of (S)-6 the racemization barrier ΔG⧧rac = 121 ± 0.5 kJ·mol−1 was established. The substitution
                                    在具有甲基Aminocarbene络合物的邻位上的芳环上的aminocarbene部分,(小号)-pentacarbonyl [(N,N-二甲基
氨基)(3-甲氧羰基-2-甲基苯基)卡宾]
铬(0)[ (S)-6 ]和(R)-五羰基[(N,N-二甲基
氨基)(5-甲氧基羰基-2-甲基苯基)卡宾]
铬(0)[ (R)-7 ]是通过对映体纯的形式制备的(S)-1-(1-
萘基)
乙醇结晶非对映异构体酯。在的情况下(小号)-6消旋屏障Δ ģ ⧧建立了rac= 121±0.5kJ·mol -1。的取代ø -甲基组与异丙基几乎没有改变外消旋屏障(Δ ģ ⧧rac = 120.5±0.5 kJ·mol -1),而邻苯基的引入导致ΔG substantial大大降低赛车。尝试在配合物(S -6)和(R -7)与
炔烃的热反应中转移手性,
钯催化插入C-H键,以及光
化学形成β-内酰胺均未成功。