First synthesis of magnesacyclopentadienes from acetylenes by treatment with BuMgHlg in the presence of Zr complexes
摘要:
Treatment of internal acetylenes and allenes with BuMgHlg (Hlg = Cl, Br) in the presence of Cp2ZrCl2 selectively leads to the formation of substituted magnesacyclopenta-2,4-dienes and alkylideneiiiaonesacyclopentenes.
Efficient synthesis of 3-sulfolenes from allylic alcohols and 1,3-dienes enabled by sodium metabisulfite as a sulfur dioxide equivalent
作者:Hang T. Dang、Vu T. Nguyen、Viet D. Nguyen、Hadi D. Arman、Oleg V. Larionov
DOI:10.1039/c8ob00745d
日期:——
We present herein an efficient and practical method for a gram scale synthesis of 3-sulfolenes using sodium metabisulfite as a safe, inexpensive, and easy to handle sulfur dioxide equivalent. Diversely-substituted 3-sulfolenes can be prepared by reacting a variety of 1,3-dienes or allylicalcohols with sodium metabisulfite in aqueous hexafluoroisopropanol (HFIP) or in aqueous methanol in the presence
Copper-Mediated Reaction of Zirconacyclopentadienes with Azides: A One-Pot Three-Component Synthesis of Multiply Substituted Pyrroles from One Azide and Two Alkynes
作者:Yiqing Zhou、Xiaoyu Yan、Chao Chen、Chanjuan Xi
DOI:10.1021/om400988g
日期:2013.11.11
A general method for the synthesis of multiply substituted pyrroles through zirconocene-mediated coupling of two alkynes and an azide in the presence of CuCl has been achieved.
A facile, high-yield synthesis of DI-η5-cyclopentadienylhafnacyclopentadiene compounds
作者:Milind B. Sabade、Michael F. Farona
DOI:10.1016/0022-328x(86)80195-4
日期:1986.8
Hafnocene dichloride was reduced with amalgamated magnesium in the presence of alkynes giving high yields of di-η5-cyclopentadienylhafnacyclopentadienes. Reaction with hydrochloric acid yields exclusively the corresponding (E,E)-butadiene derivatives.
Selective cyclometalation of disubstituted acetylenes and ethylene with diethylmagnesium and ethylmagnesium halides in the presence of zirconium complexes
作者:R. M. Sultanov、V. V. Vasil’ev、U. M. Dzhemilev
DOI:10.1134/s1070428010030097
日期:2010.3
Catalytic cyclometalation of disubstituted acetylenes and ethylene with ethylmagnesium halides EtMgHlg (Hlg = Cl, Br) and diethylmagnesium Et2Mg in the presence of Cp2ZrCl2 gave tetrasubstituted magnesacyclopenta-2,4-dienes and disubstituted magnesacyclopent-2-enes. A probable scheme of formation of cyclic unsaturated organomagnesium compounds was proposed, according to which the reactive intermediates
Unique reactivity of a 1,4-dilithiobutadiene with methyl iodide
作者:Paul F. Hudrlik、Donghua Dai、Anne M. Hudrlik
DOI:10.1016/j.tetlet.2006.03.067
日期:2006.5
4-dilithiobutadiene 5 with MeI in THF gave predominantly methyl iododiene 6. Monolithio monoiodo intermediate 8 was shown not to be involved in the formation of 6, but the results were consistent with the involvement of monolithio monomethyl intermediate 11, which could lead to 6 by metal–halogen exchange. Several other lithioalkenes also reacted with MeI to give alkenyl iodides.