17691-86-0Relevant academic research and scientific papers
Donor-Substituted Cyclobutenylidene Complexes and Cyclobutenones from Vinylidene Complexes and Electron-Rich Alkynes
Fischer, Helmut,Podschadly, Oliver,Frueh, Angelika,Troll, Carsten,Stumpf, Ruediger,Schlageter, Andreas
, p. 2667 - 2674 (2007/10/02)
Pentacarbonyl(vinylidene) complexes of chromium and tungsten, (CO)5M=C=C(R1)R2 (1) 1 = R2 = Ph (a), R1 = tBu, R2 = Et (b), Me (c); M = Cr; R1 = tBu, R2 = Me (d)> react with 1-(diethylamino)-1-propyne by regiospecific addition of the CC bond of the alkyne to the Cα=Cβ bond of the vinylidene ligand to form the cyclobutylidene complexes 2a - d.Oxidative cleavage of the cyclobutylidene ligand from 2a - d gives the corresponding cyclobutenones.The reactions of 1b with bis(diethylamino)acetylene and of 1a with 1-ethoxy-1-propyne afford the cyclobutylidene complexes 3b and 4a, respectively.In contrast, 1a reacts with diorganylcyanamides, NCNR2 (R = Me, Et, iPr), by ligand displacement and formation of the tetraphenylbutatriene and diorganylcyanamide complexes.The structures of 2c and 4a were established by X-ray analyses. Key Words: Vinylidene complexes / Cyclobutenylidene complexes / Cyclobutenone / Cyanamide complexes / Butatriene, tetraphenyl-
