“ricochet” rearrangement, with the alkyl group being shifted to the endo position at C(1) and the chromium tricarbonyl group shifted to the benzene nucleus. The structure of the product of such a rearrangement in the case of η5-C9H7(CO)3CrCH2C6H5, i.e. (1-benzyl-3a,4-7,7a-η6-indene)chromium tricarbonyl (XVIII), is established by a low temperature X-ray study, indicating an endo position for the benzyl
                                    的K烷基化[η 5 -C 9 ħ 7的Cr(CO)3 ](XA)用CH 3我和C 6 H ^ 5 CH 2
溴导致的σ烷基衍
生物η 5 -C 9 ħ 7的Cr(CO)3 Alk类型。这些配合物经历了内层“弹跳”的重排,烷基转移到C(1)的内位,三羰基
铬转移到苯核。这种重排的在η的情况下,该产物的结构5 -C 9 ħ 7(CO)3 CRCH2 ç 6 ħ 5,即(1-苄基-3α,4-7,7a-η 6 -
茚)
铬三羰基(XVIII)中,通过低温透视研究建立,指示内的苄基位置。