A new versatile binuclear seven-coordinate complex of molybdenum(II), [(μ-Cl)2{Mo(μ-Cl)(SnCl3)(CO)3}2]2−

Germa‐closo‐dodecaborate: An Ambident and Flexible Coordinating Ligand

“…The molecular structure together with selected interatomic distances and bond angles is depicted in Figure 5 [15] The interatomic distance between the molybdenum and germanium atom of 2.5758(6) Å is comparable to bond lengths reported in the literature. [16] Because of the insolubility of the zwitterion 1 in common solvents, we conducted solid-state 31 P NMR spectroscopic analysis. The spectrum shows three signals at δ = 45.1, 28.4, and 15.9 ppm for the crystalline material due to the missing C s symmetry in the solid state, thereby resulting in three different 31 P nuclei.…”

The effect of the oxidation state of molybdenum complexes on the catalytic transformation of terminal alkynes: Cyclotrimerization vs. polymerization

“…The piperidine (pip) complex [Mo(CO) 4 (pip) 2 ] (2) [36,37] was prepared in the photochemical reaction of Mo(CO) 6 and pip in n-hexane. The molybdenum(II) complex [(C 3 H 5 )pip] 2 [{(m-Cl)Mo(m-Cl)(SnCl 3 )(CO) 3 } 2 ] (3a) was synthesized in reaction of [Mo(CO) 4 (pip) 2 ] (2) and SnCl 4 in dichloromethane in accordance with a previously reported procedure [38]. A small modification of this procedure in the form of a shorter reaction time ( Analyses of the reaction products were performed on a HewlettPackard GCeMS system containing an HP590II gas chromatograph equipped with a HP-5MS column and an HP5971A mass detector.…”

“…5%) containing a vinyl unit, CH¼CH 2 , and another one (ca. 95%), containing piperidinium cation (Hpip þ ) [38]. Reactions of alkyl-or aryl-substituted alkynes ( t BuChCH, n BuChCH, and PhChCH) in dichloromethane solution containing the piperidine complex 2 are very slow and after 24 h do not give expected products of alkyne transformation.…”

Computational and experimental studies into NMR characterization of [2+2] cycloaddition products of norbornene

“…]hept-2-ylidenebicyclo[2.2.1]heptane (2,2-binorbornylidene, bi-nbe) (Scheme 2), characterized by 1 H and 13 C NMR spectroscopy and GC-MS analysis [15,16]. This dimerization reaction is concurrent to ring-opening metathesis polymerization (ROMP) and can be regarded as a coupling of two norbornylidene ligands [16][17][18][19]. The yield of bi-nbe is high, but in the presence of water it is reduced by the formation of binorbornyl ether ((nba) 2 O) [19].…”

“…This dimerization reaction is concurrent to ring-opening metathesis polymerization (ROMP) and can be regarded as a coupling of two norbornylidene ligands [16][17][18][19]. The yield of bi-nbe is high, but in the presence of water it is reduced by the formation of binorbornyl ether ((nba) 2 O) [19]. In reactions catalyzed by tungsten(II) and molybdenum(II) complexes, the formation of small amounts (ca.…”