کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1326566 | 977437 | 2009 | 8 صفحه PDF | دانلود رایگان |
Inexpensive air and moisture stable diamino-diol ligands [(2-OH-C10H6)CH2(μ-NC4H8N)CH2(C10H6-2-OH)] (1) and [(5-tBuC6H3-2-OH)CH2(μ-NC4H8N)CH2(5-tBuC6H3-2-OH)] (2) were synthesized by reacting corresponding alcohols with formaldehyde and piperazine. Treatment of ligands 1 and 2 with Pd(OAc)2 in 1:1 molar ratio afforded neutral palladium complexes [Pd{(OC10H6)CH2(μ-NC4H8N)CH2(C10H6O)}] (3) and [Pd{(5-tBuC6H3-2-O)CH2(μ-NC4H8N)CH2(5-tBuC6H3-2-O)}] (4) in good yield. The palladium complexes 3 and 4 are employed in Suzuki–Miyaura cross-coupling reactions between phenylboronic acid and several aryl chlorides or bromides. They are found to be competent homogeneous catalysts for a variety of substrates to afford the coupled products in good to excellent yields. The crystal structures of compounds 2 and 4 are also reported.
The inexpensive, phosphorus free, air and moisture stable palladium complexes of tetradentate ligands are found to be very efficient catalysts for Suzuki–Miyaura cross-coupling reactions.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 694, Issue 13, 1 June 2009, Pages 2114–2121