A K-arylacetylide complex for catalytic terminal alkyne functionalization using KO<sup>t</sup>Bu as a precatalyst
作者:Jasimuddin Ahmed、Asim Kumar Swain、Arpan Das、R. Govindarajan、Mrinal Bhunia、Swadhin K. Mandal
DOI:10.1039/c9cc07833a
日期:——
Herein we report a transition metal free catalytic terminal alkyne functionalization across the C–X triple bond (X = CH and N) with E-selective homo (alkyne–alkyne) and head-to-tail selective hetero (alkyne–nitrile) dimerization. A series of stoichiometric reactions enabled us to crystallize a reactive organometallic intermediate K-arylacetylide complex which was characterized by X-ray crystallography
作者:Leslie D. Field、Alison M. Magill、Timothy K. Shearer、Scott J. Dalgarno、Mohan M. Bhadbhade
DOI:10.1002/ejic.201100322
日期:2011.8
Symmetrical, mononuclear bis(acetylido)ruthenium(II) complexes were prepared by the reaction of [trans-RuMe2(dmpe)2] [dmpe = 1,2-bis(dimethylphosphanyl)ethane] with terminal alkynes. The complexes were characterised by multinuclear NMR spectroscopy and X-ray crystallography. In some cases, the complexes catalyse the head-to-head dimerisation of terminal alkynes to yield organic butenynes. The regiochemistry
Cyclic (Alkyl)amino Carbene Based Iron Catalyst for Regioselective Dimerization of Terminal Arylalkynes
作者:Mrinal Bhunia、Sumeet R. Sahoo、Gonela Vijaykumar、Debashis Adhikari、Swadhin K. Mandal
DOI:10.1021/acs.organomet.6b00703
日期:2016.11.14
[(cAAC)Fe(CO)(4)] (1) catalyzed head-to-head dimerization of terminal arylalkynes toward conjugated enynes in very high yield and high E selectivity (up to 84:16 E:Z). The protocol can be performed under extremely low catalyst loading down to 0.01 mol %, resulting in a high TON of 6500. A mechanistic pathway for arylalkyne dimerization has been proposed on the basis of a well-defined catalyst, an isolable intermediate, and quantum chemical calculations.