1-Benzyl-3-methylimidazolium bromide

[no abstract available

Crystal structure of 1-hydroxy-2,2,6,6-tetramethylpiperidin-1-ium trifluoromethanesulfonate

In the cation of the title salt, C9H20NO+·CF3O3S-, the six-membered heterocyclic ring displays a chair conformation. In the crystal, centrosymmetric pairs of cations and anions are linked by N-H...O and O-H...O hydrogen bonds to form rings with a R44(14) graph-set motif

Crystal structure of 1,1,2,2-tetramethyl-1,2-bis(2,3,4,5-tetramethylcyclopenta-2,4-dien-1-yl)disilane

The mol­ecular structure of the title compound, C22H38Si2, features a trans arrangement of the cyclo­penta­dienyl rings to avoid steric strain [C-Si-Si-C torsion angle = -179.0 (5)°]. The Si-Si bond length is 2.3444 (4) Å. The most notable inter­molecular inter­actions in the mol­ecular packing are C-H...[pi] contacts that lead to the formation of wave-like supra­molecular chains along the b axis

Bis(dimethyl sulfoxide)­hydridobis(triphenyl­phosphane)cobalt(I)

The title compound, [CoH(C18H15P)2(C2H6OS)2], was synthesized by the reaction of chloridotris(triphenyl­phosphane)cobalt(I), [ClCo(PPh3)3], in the presence of one equivalent potassium hydridotris(pyrazol­yl)borate in dimethyl sulfoxide. The structure displays a distorted trigonal-pyramidally coordinated cobalt(I) atom, with two phosphane ligands and one DMSO ligand in the equatorial plane. The coordination is completed by one further DMSO ligand and the anionic hydride in the axial positions

Iodidobis(η5-penta­methyl­cyclo­penta­dien­yl)titanium(III)

In the title complex mol­ecule, [Ti(C10H15)2I], the paramagnetic Ti(III) atom is coordinated by two penta­methyl­cyclo­penta­dienyl (Cp*) ligands and one iodide ligand. The two Cp* ligands are in a staggered orientation. The coordination geometry at the titanium atom can be described as distorted trigonal-planar

[1-Dimethyl­silyl-2-phenyl-3-(η5-tetra­methyl­cyclo­penta­dien­yl)­prop-1-en-1-yl-κC 1](η5-penta­methyl­cyclo­penta­dien­yl)titanium(III)

The title compound, [Ti(C10H15)(C20H26Si)], was obtained from the reaction of [Ti{η5:η1-C5Me4(CH2)}(η5-C5Me5)] with the alkynylsilane PhC2SiMe2H. The complex crystallizes with two independent mol­ecules in the asymmetric unit, which differ in the conformation of the propenyl unit, resulting in their having opposite helicity. No inter­molecular inter­actions or inter­actions involving the Si—H bond are present. The observed geometrical parameters are unexceptional compared to known structures of the same type

Crystal structure of (E)-pent-2-enoic acid

The mol­ecule of the title compound, C5H8O2, a low-melting [alpha],[beta]-unsaturated carb­oxy­lic acid, is essentially planar [maximum displacement = 0.0239 (13) Å]. In the crystal, mol­ecules are linked into centrosymmetric dimers via pairs of O-H...O hydrogen bonds

Crystal structure of (E)-undec-2-enoic acid

In the mol­ecule of the title low-melting [alpha],[beta]-unsaturated carb­oxy­lic acid, C11H20O2, the least-squares mean line through the octyl chain forms an angle of 60.10 (13)° with the normal to plane of the acrylic acid fragment (r.m.s. deviation = 0.008 Å). In the crystal, centrosymmetrically related mol­ecules are linked by pairs of O-H...O hydrogen bonds into dimers, forming layers parallel to the (041) plane

(η5-Cyclo­penta­dien­yl)bis­(triphenyl­phosphane)cobalt(I)–toluene–n-hexane (1/0.20/0.25)

The title compound, [Co(C5H5)(C18H15P)2]·0.2C7H8·0.25C6H14, was synthesized by the reaction of cobaltocene, Cp2Co, with elemental lithium in tetra­hydro­furan in the presence of two equivalents of PPh3. The mol­ecular structure displays a cobalt(I) center in a distorted trigonal-planar coordination environment, with one Cp and two phosphane ligands. There are two crystallographically independent mol­ecules in the asymmetric unit besides the disordered solvent molecules

Efficient palladium-catalyzed synthesis of 2-aryl propionic acids

A flexible two-step, one-pot procedure was developed to synthesize 2-aryl propionic acids including the anti-inflammatory drugs naproxen and flurbiprofen. Optimal results were obtained in the presence of the novel ligand neoisopinocampheyldiphenylphosphine (NISPCPP) (9) which enabled the efficient sequential palladium-catalyzed Heck coupling of aryl bromides with ethylene and hydroxycarbonylation of the resulting styrenes to 2-aryl propionic acids. This cascade transformation leads with high regioselectivity to the desired products in good yields and avoids the need for additional purification steps. © 2020 by the authors. Licensee MDPI, Basel, Switzerland