Gold-Catalyzed Cyclization/Hydroboration of 1,6-Enynes: Synthesis of Bicyclo[3.1.0]hexane Boranes.

The gold-catalyzed cyclization/hydroboration of 1,6-enynes offers facile, versatile, and atom-economical one-step access to bicyclo[3.1.0]hexane boranes.

Nanosized Carbon Macrocycles Based on a Planar Chiral Pseudo Meta-[2.2]Paracyclophane.

Structural designs combining cycloparaphenylenes (CPPs) backbone with planar chiral [2.2]paracyclophane ([2.2]PCP) lead to optical-active chiral macrocycles with intriguing properties.

Drosera-Inspired Dual-Actuating Double-Layer Hydrogel Actuator.

Drosera is a small insectivorous plant whose antennae can fold up, encircle, and prey. The rapid movement of the antennae is achieved by the synergistic effect of a double-layer structure with the antennae contracts on the front and expands on the back. In this work, a drosera-inspired dual-actuating double-layer hydrogel actuator is proposed, in which the temperature-responsive poly(N, N-diethyl acrylamide) (PDEAAm) layer acts as the main actuation layer and a moisture-responsive poly(acrylamide) (PAAm) layer acts as the auxiliary actuation layer.

Dehydrogenation of iron amido-borane and resaturation of the imino-borane complex.

We report on the first isolation and structural characterization of an iron phosphinoimino-borane complex Cp*Fe(η-HB[double bond, length as m-dash]NCHPPh) by dehydrogenation of iron amido-borane precursor Cp*Fe(η-HB-NHCHPPh). Significantly, regeneration of the amido-borane complex has been realized by protonation of the iron(ii) imino-borane to the amino-borane intermediate [Cp*Fe(η-HB-NHCHPPh)] followed by hydride transfer. These new iron species are efficient catalysts for 1,2-selective transfer hydrogenation of quinolines with ammonia borane.

Controlled partial transfer hydrogenation of quinolines by cobalt-amido cooperative catalysis.

Catalytic hydrogenation or transfer hydrogenation of quinolines was thought to be a direct strategy to access dihydroquinolines. However, the challenge is to control the chemoselectivity and regioselectivity. Here we report an efficient partial transfer hydrogenation system operated by a cobalt-amido cooperative catalyst, which converts quinolines to 1,2-dihydroquinolines by the reaction with HN·BH at room temperature.

Bimetallic nickel-cobalt hydrides in H activation and catalytic proton reduction.

The synergism of the electronic properties of nickel and cobalt enables bimetallic NiCo complexes to process H. The nickel-cobalt hydride [(dppe)Ni(pdt)(H)CoCp*] ( ) arising from protonation of the reduced state was found to be an efficient electrocatalyst for H evolution with ClCHCOOH, and the oxidized [Ni(ii)Co(iii)] form is capable of activating H to produce . The features of stereodynamics, acid-base properties, redox chemistry and reactivity of these bimetallic NiCo complexes in processing H are potentially related to the active site of [NiFe]-Hases.

Reactivity of the diphosphinodithio ligated nickel(0) complex toward alkyl halides and resultant nickel(i) and nickel(ii)-alkyl complexes.

Diphosphinodithio ligated complexes of nickel(0), nickel(i) and nickel(ii)-alkyl with a reactivity relevant to the C-C bond formation were described. Stoichiometric reactions of the nickel(0) complex, [(P2S2)Ni] ([1]0, P2S2 = (Ph2PC6H4CH2S)2(C2H4)), with alkyl halides (RX) such as C6H5CH2Br, C2H3CH2Br, C2H5I and (CH3)2CHI were investigated, from which the products were found to be highly dependent on the nature of RX used. Oxidative addition of C2H3CH2Br to [1]0 provides the stable Ni(ii)-alkyl complexes [1-allyl]+.

Terminal Thiolate-Dominated H/D Exchanges and H Release: Diiron Thiol-Hydride.

To determine the reaction pathways at a metal-ligand site in enzymes, we incorporated a terminal thiolate site into a diiron bridging hydride. Trithiolato diiron hydride, (μ-H)Fe(pdt)(dppbz)(CO)(SR) (1(μ-H)) [pdt = 1,3-(CH)S, dppbz = 1,2-CH(PPh), RS = 1,2-CyPCHS)], was synthesized directly by photoassisted oxidative addition of 1,2-CyPCHSH to Fe(pdt)(dppbz)(CO). The terminal thiolate in 1(μ-H) undergoes protonation, affording a thiol-hydride complex [1(μ-H)H].