Magnesium‐Induced Pinacol Coupling of Aromatic Aldehydes and Ketones Under Ultrasound Irradiation
作者:Jian‐Sen Wang、Ji‐Tai Li、Zhi‐Ping Lin、Tong‐Shuang Li
DOI:10.1081/scc-200057305
日期:2005.5.1
Abstract The system of magnesium and magnesiumiodide can reduce some aromatic aldehydes and ketones to the corresponding pinacols in good yields within 10–60 min at room temperature under ultrasound irradiation.
Reductive Coupling of Carbonyl Compounds to Pinacols with Zinc in THF-Saturated Aqueous Ammonium Chloride
作者:Rahim Hekmatshoar、Issa Yavari、Yahya S. Beheshtiha、Majid M. Heravi
DOI:10.1007/s007060170083
日期:2001.6
In the presence of metallic zinc, aldehydes and ketones experience reductive coupling in tetrahydrofuran-saturated aqueousammoniumchloride (5:3) to afford the corresponding pinacols in moderate to high yields.
Polycyclic aromatic hydrocarbons are difficult substrates for hydrogenation because of the thermodynamic stability caused by aromaticity. We report here the first chromium- and cobalt-catalyzed, regiocontrolled hydrogenation of polycyclic aromatic hydrocarbons at ambient temperature. These reactions were promoted by low-cost chromium or cobalt salts combined with diimino/carbene ligand and methylmagnesium
Some newer aspects of Clemmensen reduction of aromatic ketones
作者:Sunil K. Talapatra、Syamal Chakrabarti、Asok K. Mallik、Bani Talapatra
DOI:10.1016/s0040-4020(01)87928-x
日期:1990.1
9,9'-Bifluorenyl (6), 1,1,2,2-tetraphenylethane (10) and 10,10'-bianthrone (18) have been obtained as a new type of products in Clemmensen reduction of 9H-fluoren-9-one (3), benzophenone (7) and 9,10-anthraquinone (13) respectively. Dibenzo(g,p)chrysene (5) is formed as the major product in the reduction of 3. Plausible mechanistic pathways for the formation of the unconventional products have been
Facile and Fast Pinacol Rearrangement by AlCl3 in the Solid State
作者:Parviz Rashidi-Ranjbar、Ebrahim Kianmehr
DOI:10.3390/60500442
日期:——
A facile and efficient synthetic procedure for effecting the pinacol rearrangement catalyzed by AlCl3 in the absence of solvent is developed. The rearrangement product is obtained at room temperature in a few minutes and in almost quantitative yield. Benzylic pinacols rearrange under these conditions, while aliphatic pinacols do not react.