Rational Design of a Metallocatalytic Cavitand for Regioselective Hydration of Specific Alkynes
作者:Naoki Endo、Mami Inoue、Tetsuo Iwasawa
DOI:10.1002/ejoc.201701613
日期:2018.3.7
supramolecular flask device with inwardly oriented AuI and P=O is described, including a description of its catalytic proclivity in the regioselectivehydration of specificalkynes. The bifunctional cavity favors selective folding of a single side chain of unsymmetrical alkynes through host–guest interactions, which skillfully directs the water molecule to one carbon atom of the triple bond.
By using a readily available, air‐ and moisture‐stable dihydrido–Ru complex, a variety of Zolefins are accessible under transfer‐hydrogenation conditions with formic acid as the hydrogen source in excellent yields and Z/E selectivities.
Synthesis of Cyclopentadienols by Rhodium-Catalyzed C–H Activation of 8-Formylquinolines and [2+2+1] Carbocyclization with Alkynes
作者:Xingwei Li、Xifa Yang、Zisong Qi
DOI:10.1021/acscatal.6b01936
日期:2016.10.7
An efficient Rh(III)-catalyzed redox-neutral [2+2+1] coupling between 8-formylquinolines and alkynes has been realized for the synthesis of cyclopentadienols with broad substrate scope and functional group tolerance. The reaction occurs via C (acyl)–H activation with double insertion of the alkyne in high atom-economy. Instead of simply undergoing a [2+2+1] cyclization, a subsequent formal intermolecular
selective semihydrogenation of alkynes to alkenes on shape‐controlled palladium (Pd) nanocrystals was performed. Pd nanocrystals with a cubic shape and thus exposed 100} facets were synthesized in an aqueous solution through the reduction of Na2PdCl4 with L‐ascorbic acid in the presence of bromide ions. The Pd nanocubes were tested as catalysts for the semihydrogenation of various alkynes such as 5‐decyne
The Reaction of Alkenylboranes with Palladium Acetate. Stereoselective Synthesis of Olefinic Derivatives
作者:Hidetaka Yatagai
DOI:10.1246/bcsj.53.1670
日期:1980.6
The reactions of alkenylboranes with palladium acetate were investigated. Alkenyldialkylboranes, derived from terminal alkynes, underwent intramolecular migration reaction in the presence of an equimolar amount of palladium acetate and triethylamine to give (E)-olefins. On the other hand, under the same conditions as above or even in the presence of catalyticamounts of palladium acetate, alkenyldialkylboranes