A novel system consisting of low valent vanadium and diethyl phosphonate or triethyl phosphite for the highly stereoselective reduction of gem-dibromocyclopropanes
by the fact that the hapticity of the ligand in the Ti and Ni substrates changes easily allowing for an extra temporary coordination of [Re2(CO)9], for example, generated in situ and leading to CpRe(CO)3. Heating titanium compound 1 with Re2(CO)10 led to CpRe(CO)3 and the substituted cyclopentadienyltricarbonylrhenium compound 2 with yields of 36 and 37%, respectively.
Intermetallic transfer of unsymmetrical borylene fragments: isolation of the second early-transition-metal terminal borylene complex and other rare species
作者:Bret B. Macha、Debabrata Dhara、Krzysztof Radacki、Rian D. Dewhurst、Holger Braunschweig
DOI:10.1039/d0dt03557b
日期:——
effectively transfer the borylene ligand to other transition metal complexes by replacing one or two carbonyl ligands upon irradiation of the reaction mixture with UV light. This borylenetransfer reaction led to the formation of new terminal and bridging borylenecomplexes which cannot be formed by the corresponding salt elimination reactions, including a rare example of a bis(terminal borylene) complex
Generation of Oxozirconocene Complexes from the Reaction of Cp<sub>2</sub>(THF)ZrN-<i>t</i>-Bu with Organic and Metal Carbonyl Functionalities: Apparently Divergent Behavior of Transient [Cp<sub>2</sub>ZrO]
作者:Sun Yeoul Lee、Robert G. Bergman
DOI:10.1021/ja954050t
日期:1996.1.1
Cp2(THF)ZrN-t-Bu (1a) toward a series of organic and metal carbonyl complexes has been examined. The ZrN linkage of 1a undergoes imido/oxo exchange reactions with the carbonylcompounds and generates three different types of oxozirconocene products: (Cp2ZrO)n (3), (Cp2Zr)2(μ-O)(μ-N-t-Bu) (9), and (Cp2Zr)2O3CCPh2 (12) were obtained from the reactions of 1a with RR‘CO (R = R‘ = Me (2b); R = Ph, R‘ = H (2c);
已经检查了 Cp2(THF)ZrN-t-Bu (1a) 对一系列有机和金属羰基配合物的反应性。1a 的 ZrN 键与羰基化合物发生亚胺/氧代交换反应并生成三种不同类型的氧代锆茂产物:(Cp2ZrO)n (3)、(Cp2Zr)2(μ-O)(μ-Nt-Bu) (9 ), 和 (Cp2Zr)2O3CCPh2 (12) 是从 1a 与 RR'CO 的反应中获得的 (R = R' = Me (2b); R = Ph, R' = H (2c); R = i-Pr, R' = H (2d))、CpCo(CO)2 (7) 和 Ph2CCO (10)。这些反应中的副产物分别是亚胺 RR'CN-t-Bu (4b-d)、异腈配合物 CpCo(CO)(CN-t-Bu) (8a) 和烯酮亚胺 Ph2CCN-t-Bu (11a)。随着含有α-氢原子的更多受阻羰基,反应遵循不同的途径,导致形成烯醇配合物Cp2Zr(NH-t-Bu)(OCR3CR2R1)
Complexes of a gallium heterocycle with transition metal dicyclopentadienyl and cyclopentadienylcarbonyl fragments, and with a dialkylmanganese compound
作者:Simon Aldridge、Robert J. Baker、Natalie D. Coombs、Cameron Jones、Richard P. Rose、Andrea Rossin、David J. Willock
DOI:10.1039/b604640a
日期:——
shows the complexes to be monomeric. One (M = V) reacts with one equivalent of [K(tmeda)][Ga[N(Ar)C(H)]2}] to give the crystallographically characterised, anionic bis(gallyl)-complex, [K(tmeda)][V(C5H4Me)2[Ga[N(Ar)C(H)]2}]2]. For comparison, the reaction of [K(tmeda)][Ga[N(Ar)C(H)]2}] with [MnCH(SiMe3)2}2] was carried out and gave the monomeric, anionic complex, [K(tmeda)][MnCH(SiMe3)2}2[Ga[N(Ar)C(H)]2}]]
Ultrafast Studies of Stannane Activation by Triplet Organometallic Photoproducts
作者:Justin P. Lomont、Son C. Nguyen、Charles B. Harris
DOI:10.1021/om300175e
日期:2012.5.28
nonadiabatic behavior as the Sn–H bond approaches the metal center. Interestingly, we find no evidence for an external heavy-atom effect in the calculated spin–orbit coupling values, and we offer an explanation for the results of these calculations. To our knowledge, this study represents the first ultrafast investigation into Sn–H bondactivation by organometallic catalysts.