Allylbenzene chromiumtricarbonyl complexes are deprotonated under several basic conditions: tBuOKTHF, NaHDMF and phase transfer catalysis. The regioselectivity of the addition of carbonyl compounds on the complexed allylic anions is influenced by the nature of the cations M+. With M+ = K+, Na+, N+(nBu)4 the reaction of aromatic aldehydes is under thermodynamic control: only the most stable alcohols
:烯丙基苯chromiumtricarbonyl络合物几个碱性条件下脱质子吨BuOKTHF,NaH
DMF和相转移催化。在络合的烯丙基阴离子上添加羰基化合物的区域选择性受阳离子M +的性质影响。当M + = K +,Na +,N +(n Bu)4时,芳族醛的反应处于热力学控制下:仅分离出最稳定的醇,二烯或酮。当M + = K +时,酮通过原位Oppenauer-Woodward氧化反应形成。与M + = Li+反应在很大程度上受动力学控制。
苯甲醛产生α和γ醇的混合物。与
苯乙酮和
二乙基酮反应是区域特异性的。仅获得直链醇。该结果不同于在类似条件下在非复合序列中获得的结果,是复合苯核的空间应变的结果。