949-47-3Relevant academic research and scientific papers
Alkyne oligomerization catalyzed by molybdenum(0) complexes
Ardizzoia, G.Attilio,Brenna,LaMonica,Maspero,Masciocchi
, p. 173 - 180 (2002)
Three new molybdenum(0) complexes, [Mo(CO)3(Hpz)3] (1), [Mo(CO)2(Hpz)2(DMAD)2] (2), (DMAD = dimethyl acetylenedicarboxylate) and [Mo(CO)3(1-Me-imidazole)3] (3) were synthesized and characterized. Their activity and selectivity in alkyne cyclotrimerization and co-trimerization reactions was investigated. The molecular structures of 1 and 2 have been determined by unconventional powder and standard single-crystal diffraction methods, respectively. 1 consists of a pseudo-octahedral complex of C3 symmetry, with the ligands in fac disposition; complex 2, of idealized C2 symmetry, is obtained by substitution of one CO and one pyrazole in 1 by two DMAD ligands, and shows the rare trans configuration of π-bound acetylenic moieties.
Hydrogen-Bonding Controlled Nickel-Catalyzed Regioselective Cyclotrimerization of Terminal Alkynes
Yang, Kai,Wang, Pengfei,Sun, Ze-Ying,Guo, Minjie,Zhao, Wentao,Tang, Xiangyang,Wang, Guangwei
supporting information, p. 3933 - 3938 (2021/05/26)
Herein we report a hydrogen-bonding controlled nickel-catalyzed regioselective cyclotrimerization of terminal alkynes in moderate to excellent yields with high regioselectivities toward 1,3,5-trisubstituted benzenes. This method features a cheap catalyst, mild reaction conditions, and excellent functional group compatibility. The Ni-B(OH)2 complex in situ generated from NiCl2·DME and tetrahydroxydiboron might act as an active catalyst. After three consecutive cis-additions of terminal alkynes, internal migratory insertion cyclization, and β-boron elimination induced aromatization, 1,3,5-trisubstituted benzenes were selectively established.
Can the Ti(OiPr)4/nBuLi combination of reagents function as a catalyst for [2+2+2] alkyne cyclotrimerisation reactions?
Siemiaszko, Gabriela,Six, Yvan
supporting information, p. 20219 - 20226 (2018/12/13)
Catalysis of the cyclotrimerisation of alkynes with the Ti(OiPr)4/nBuLi system was studied, leading to the development of a particularly convenient and reliable protocol. This method allows the [2+2+2] cycloaddition reaction to proceed within a few minutes under microwave conditions, with generally good selectivity from a variety of aromatic and aliphatic alkynes.
A simple cobalt catalyst system for the efficient and regioselective cyclotrimerisation of alkynes
Hilt, Gerhard,Vogler, Thomas,Hess, Wilfried,Galbiati, Fabrizio
, p. 1474 - 1475 (2007/10/03)
The intermolecular cyclotrimerisation of terminal and internal alkynes can be catalysed by simple cobalt complexes such as a CoBr2(diimine) under mild reaction conditions when treated with zinc and zinc iodide with high regioselectivity in excellent yields. The Royal Society of Chemistry 2005.
STRUCTURAL INVESTIGATION ON SOME TRISISOPROPENYL-BENZENES BY THEORETICAL AND GAS-PHASE UV PHOTOELECTRON SPECTROSCOPIC STUDY
Andoni, E.,Bossa, M.,Carusi, P.,Cauletti, C.,Furlani, A.
, p. 115 - 122 (2007/10/02)
The structure of 1,3,5-trisisopropenylbenzene (I) and 1,2,4-trisiopropenylbenzene (II) was investigated by gas-phase UV photoelectron spectroscopy (UPS) and theoretical (HAM 3) calculations.In the case of compound I we found that the geometrical parameters do not affect appreciably the ordering and spacing of the highest occupied molecular orbitals whereas in II agreement between experimental and calculated IEs was found only for some geometries, characterized also by the lowest total energies.This difference is reflected in the spacing of energy levels in the two molecules.
