949-47-3Relevant articles and documents
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.
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.
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.