Synthesis of Quinoline-Based Pt-Sb Complexes with L- or Z-Type Interaction: Ligand-Controlled Redox via Anion Transfer.

A series of Pt-Sb complexes with two or three L-type quinoline side arms were prepared and studied. Two ligands, tri(8-quinolinyl)stibane (SbQ, Q = 8-quinolinyl, ) and 8,8'-(phenylstibanediyl)diquinoline (SbQPh, ), were used to synthesize the Pt-Sb complexes (SbQ)PtCl () and (SbQPh)PtCl (). Chloride abstraction with AgOAc provided the bis-acetate complexes (SbQ)Pt(OAc) () and (SbQPh)Pt(OAc) ().

Study on the relationship between vertebrobasilar dolichoectasia and posterior cranial fossa space.

Objective: To investigate the correlation between vertebrobasilar dolichoectasia (VBD) and posterior cranial fossa (PCF) space.

Methods: The medical records and imaging data of patients with VBD and control group were collected from June 2021 to June 2022 in the Third People's Hospital of Hubei Province. All patients with VBD were graded by head and neck CTA.

Ethylene Dimerization and Oligomerization Using Bis(phosphino)boryl Supported Ni Complexes.

We report the dimerization and oligomerization of ethylene using bis(phosphino)boryl supported Ni(II) complexes as catalyst precursors. By using alkylaluminum(III) compounds or other Lewis acid additives, Ni(II) complexes of the type (PBP)NiBr (R = Bu or Ph) show activity for the production of butenes and higher olefins. Optimized turnover frequencies of 640 mol·mol·s for the formation of butenes with 41(1)% selectivity for 1-butene using (PBP)NiBr, and 68 mol·mol·s for butenes production with 87.

Cu(II) carboxylate arene C─H functionalization: Tuning for nonradical pathways.

We report carbon-hydrogen acetoxylation of nondirected arenes benzene and toluene, as well as related functionalization with pivalate and 2-ethylhexanoate ester groups, using simple copper(II) [Cu(II)] salts with over 80% yield. By changing the ratio of benzene and Cu(II) salts, 2.4% conversion of benzene can be reached.

Tetracyclic dihydronaphthalene derivatives via gold-catalyzed aminative homodimerization of ortho-alkynylbenzaldehydes.

Gold(i) catalyzes domino homodimerization of o-alkynylbenzaldehydes via a sequence of 6-endo-dig-cyclization, amine addition, and [4+2] cycloaddition involving two bicyclic intermediates. The resulting products integrate medicinally relevant 1,2-dihydronaphthalene and isochromene moieties into a single amine-substituted tetracyclic framework.

Competing amination and C-H arylation pathways in Pd/xantphos-catalyzed transformations of binaphthyl triflates: switchable routes to chiral amines and helicene derivatives.

A Pd(OAc)2/xantphos catalyst system was found effective for benzylaminations of binaphthyl 2-triflates bearing a variety of alkyl, benzyl, and substituted phenyl substituents at the 2'-position. With 2'-aryl substituents, an intramolecular Pd-catalyzed C-H arylation was observed as a competing side reaction under some conditions. By adjusting the solvent and quantity of the amine, the reaction was optimized to favor either the amination or the C-H arylation pathway, affording two distinct and potentially useful sets of products.

Assembly of fused indenes via Au(I)-catalyzed C1-C5 cyclization of enediynes bearing an internal nucleophile.

A tandem reaction initiated by Au(I)-catalyzed C1-C5 cyclization of enediynes bearing an internal carboxy nucleophile has been developed, providing a distinctive methodology for the assembly of fused indenes including indeno[1,2-c]isochromen-5(11H)-ones and indeno[1,2-b]pyran-2(5H)-ones. A mechanism involving the concerted formation of the five- and six-membered rings was proposed.