Strikingly Different Reactivity Patterns of Fischer Alkoxycarbene and Thiocarbene Complexes in Experimental and Theoretical Studies
作者:Betül Karatas、Isabella Hyla-Kryspin、Rudolf Aumann
DOI:10.1021/om700391t
日期:2007.9.1
complexes 11a−l, derived from [(OC)5MC(SEt)CH2R] (8a−e; M = W, Cr; R = n-Pr, Me, c-C7H7, c-C6H7Fe(CO)3) and imidoyl chlorides under similar conditions, form pyrroles 16a−h and 17k,l by α-cyclization. On the basis of the calculated DFT/BP86 potential energy surfaces of the particular reaction channels it is shown that (β-imino)alkoxycarbene compounds 10 prefer a metalla(di-π-methane) rearrangement due to
观察到铬和钨的烷氧基卡宾和硫代卡宾络合物的反应存在显着差异。因此,由[(OC)5 W C(OEt)CH 2 R](7a - c ; R = n -Pr,Me,c -C 7 H 7原位生成(β-亚氨基)乙氧基卡宾络合物10a - e)和亚氨酰氯R 1 ClC NCHR 2 R 3(9a - f ; R 1 = t- Bu,Ph,2-呋喃基; R 2 = H,Me; R 3= Me,Et,Ph),经历了金属(二-π-甲烷)重排,生成(N-烯氨基)乙氧基卡宾络合物12a - e,而相应的(β-亚氨基)硫代卡宾络合物11a - l衍生自[(OC )5 M C(SEt)CH 2 R](8a - e ; M = W,Cr; R = n -Pr,Me,c -C 7 H 7,c -C 6 H 7 Fe(CO)3)和亚氨酰氯在相似条件下形成吡咯16a - h和通过α-环化得到的17k,l。具体的反应通道的计算DFT