- An N-Heterocyclic Carbene-Nickel Half-Sandwich Complex as a Precatalyst for Suzuki-Miyaura Coupling of Aryl/Heteroaryl Halides with Aryl/Heteroarylboronic Acids
-
A nickel half-sandwich complex supported by our original NHC ligand was developed as a robust precatalyst for Suzuki-Miyaura cross-coupling. The addition of PPh3 was a crucial element in the suppression of side reactions and in accelerating the cross-coupling reaction. By employing the optimal conditions, aryl-aryl, heteroaryl-aryl, and heteroaryl-heteroaryl couplings were achieved.
- Ando, Shin,Matsunaga, Hirofumi,Ishizuka, Tadao
-
p. 1266 - 1272
(2018/06/18)
-
- Kinetics of aminolysis of 2,4-dinitrophenyl acetate
-
The second order rate constants for the reaction of 2,4-dinitrophenyl acetate with aniline and p- and o-substituted anilines have been reported in 10percent acetonitrile-90percent water (v/v) mixture at 25 deg, 30 deg, 35 deg and 40 deg C.In the reaction of p-substituted anilines, electron-releasing groups facilitate the reaction while electron-withdrawing groups retard it.The p-value is evaluated to be -2.33 +/- 0.16.The Broensted plot is also linear with βN = 0.792 +/- 0.027 at 30 deg C.The ΔS values are all negative as expected for bimolecular nucleophilic substitution reactions.In the case of o-substituted anilines, the rate data have been analyzed in terms of electronic and steric effects.
- Shunmugasundaram, A.,Thanulingam, T. Lekshmana,Ponnukalai, M.
-
p. 757 - 760
(2007/10/02)
-
- REACTION OF DIAZONIUM SALTS WITH TRANSITION METALS X. FORMYLATION OF ARENEDIAZONIUM SALTS WITH CARBON MONOXIDE AND SILYL HYDRIDES UNDER PALLADIUM CATALYSIS
-
Arenediazonium tetrafluoroborates (ArN2BF4 where Ar = X-C6H4; X = H, 2-Me, 3-Me, 4-Me, 4-MeO, 4-MeCO, 4-EtOCO, 2-Ph, 2-Cl, 3-Cl, 4-Cl, 4-Br, 4-I, 3-NO2 and 4-NO2) were easily converted to aromatic aldehydes (ArCHO) in good yields through the palladium-catalyzed reaction with CO and Et3SiH or polymethylhydrosiloxane (PHMS) at room temperature.
- Kikukawa, Kiyoshi,Totoki, Takatoshi,Wada, Fumio,Matsuda, Tsutomu
-
p. 283 - 288
(2007/10/02)
-