meta-Dialkylamino- or meta-chloro-toluenetricarbonylchromium complexes are much more reactive towards aldehydes in a basic medium than the corresponding para-substituted complexes. If two potential sites of attack, namely the meta and para positions of the C6H5 ring are present in the same molecule only meta-substituted hydroxymethyl products are formed. Dialkylaminoindanetricarbonylchromium is a good
元-Dialkylamino-或间位-
氯toluenetricarbonylchromium络合物是更向反应在碱性介质中的醛比相应的对位取代的配合物。如果在同一分子中存在两个潜在的攻击位点,即C 6 H 5环的间位和对位,则仅形成间位取代的羟甲基产物。二烷基
氨基
茚满三羰基
铬是显示该反应的立体
化学范围的一个很好的例子,因为获得的脂环族络合物是由羰基化合物在外位的区域特异性和立体特异性加成而产生的。