Regiospecific hydroselenation of terminal acetylenes using aluminum phenylselenolate anions
摘要:
Regiospecific hydroselenation of terminal acetylenes using aluminum phenylselenolates afforded the 1-organyl-1-phenylseleno ethenes in good yields. The first example of exclusive formation of the hydroselenation Markovnikov adducts is described. Copyright (C) 1996 Elsevier Science Ltd
A variety of transition metal complexes catalyzed the regioselective hydroselenation of acetylenes. In particular, the palladium acetate-catalyzed reaction afforded the Markovnikov adducts with high selectivity.
Highly regioselective hydroselenation and double-bond isomerization of terminal alkynes with benzeneselenol catalyzed by bis(triphenylphosphine)palladium(II) dichloride
Bis(triphenylphosphine)palladium(II) dichloride (PdCl2(PPh3)2) catalyzesregioselective addition of benzeneselenol to terminal alkynes and the subsequent double-bond isomerization to afford the corresponding internal alkenyl selenides in good yields.
[GRAPHICS]The Pt-catalyzed carboselenation of terminal alkynes with selenoesters provided vinylselenides regio- and stereoselectively in moderate yields.
Palladium(II) Acetate in Pyridine as an Effective Catalyst for Highly Regioselective Hydroselenation of Alkynes
作者:Ikuyo Kamiya、Etsuyo Nishinaka、Akiya Ogawa
DOI:10.1021/jo048727j
日期:2005.1.1
A highly regioselective hydroselenation of terminal alkynes with benzeneselenol can be achieved by the combination of palladium acetate and pyridine, providing the corresponding terminal alkenes, (i.e., 2-phenylseleno-1-alkenes) as a sole product. In this hydroselenation, pyridine may act as a suitable ligand for active palladium intermediates.
Highly Regioselective Palladium-catalyzed Double Hydroselenation of Terminal Alkynes with Benzeneselenol in the Presence of Acetic Acid
Palladium diacetate (Pd(OAc)2), in the presence of acetic acid, is found to exhibit excellent catalytic activity for the double hydroselenation of terminal alkynes with benzeneselenol to yield the corresponding diselenoketals regioselectively.