Organotitanium chemistry XVIII. Dehalogenation of organic halides by Cp2TiX (X = Cl, Br)
作者:Qian Yanlong、Li Guisheng、Yao-Zeng Huang
DOI:10.1016/0022-328x(90)85446-6
日期:1990.1
Dicyclopentadienyltitanium chloride and bromide prepared in situ from the reduction of dicyclopentadienyltitanium dichloride by isopropylmagnesium chloride and bromide, respectively, are effective dehalogenating reagents for benzylic, allylic halides and α-bromoketones. Benzylic and allylic halides are transformed into the coupling products whereas the α-bromoketones are reduced to the corresponding ketones
Published as part of the Special Topic Modern Radical Methods and their Strategic Applications in Synthesis Abstract Benzyl and allyl halides undergo homocoupling when treated with zinc in the presence of a catalytic amount of a cationic iridium(III) complex under irradiation with 400 nm light-emitting diodes. The reaction proceeds through the intermediate formation of an organozincreagent, which disproportionates
Deoxygenative Dimerization of Benzylic and Allylic Alcohols, and Their Ethers and Esters Using Lanthanum Metal and Chlorotrimethylsilane in the Presence of a Catalytic Amount of Iodine and Copper(I) Iodide
作者:Toshiki Nishino、Yutaka Nishiyama、Noboru Sonoda
DOI:10.1246/bcsj.76.635
日期:2003.3
Benzylic and allylic alcohols were deoxygenatively dimerized by a treatment with lanthanum metal and chlorotrimethylsilane in the presence of a catalytic amount of iodine, giving the corresponding coupling products, alkanes, in moderate-to-good yields. This dimerization reaction was dramatically accelerated by the addition of a catalytic amount of copper(I) iodide. Similarly, ethers and esters were
Novel Reactivity of N-Bridged Diiron Phthalocyanine in the Activation of CH Bonds: Hydroacylation of Olefins as an Example of the Efficient Formation of CC Bonds
作者:Leonardo X. Alvarez、Evgeny V. Kudrik、Alexander B. Sorokin
DOI:10.1002/chem.201100650
日期:2011.8.16
Bridge over troubled iron: An N‐bridged diiron tetra‐tert‐butylphthalocyanine complex, usually employed for oxidation reactions, also catalyzes the addition of acetaldehyde to olefins (see scheme) to provide methylketones with a high selectivity (up to 92 %) and high turnover numbers (3600–5700).
Light-mediated transformations of olefins into alcohols: reactions of hydroxyl radicals with cycloalkenes
作者:H.R. Sonawane、B.S. Nanjundiah、R.G. Kelkar
DOI:10.1016/s0040-4020(01)82107-4
日期:1986.1
Reactions of hydroxyl radicals, generated by photodecomposition of hydrogen peroxide in acetonitrile, with a wide variety of cycloalkenes have been examined. The results show that the major reaction is the addition of hydroxyl radicals to the less substituted end of the double bond, furnishing the secondary alcohols. The reactivity pattern and the observed regio- and stereoselectivity clearly reveal