- A Simple One-step Synthesis of Phenyl Ethers from Phenyl Acetates
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Phenyl acetates when refluxed with alkyl halides in acetone solution in the presence of a crown ether and anhydrous potassium carbonate undergo alkylation yielding phenyl ethers.
- Banerjee, Sunil K.,Gupta, Bishan D.,Singh, Kuber
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- A green approach for the decoration of Pd nanoparticles on graphene nanosheets: An in situ process for the reduction of C-C double bonds and a reusable catalyst for the Suzuki cross-coupling reaction
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A new strategy for in situ synthesis of palladium nanoparticles (Pd NPs) decorated on reduced graphene oxide (rGO) nanosheets with controlled size and shape is reported. This strategy was designed as three processes in one pot, namely, (a) reduction of graphene oxide, (b) formation of Pd NPs on the rGO nanosheets and (c) simultaneous reduction of olefin. In this synthesis process, a hydrogen atmosphere was used to develop the Pd NPs-rGO nanocatalyst, which is reusable and easily separable. The influence of the size and morphology of the Pd-rGO-H2 catalyst on the catalytic activity in the Suzuki cross-coupling reaction was investigated by comparing with other catalysts, Pd-rGO-As and Pd-rGO-Gl, and they were synthesized by different reducing agents, ascorbic acid and glucose, respectively. The catalysts were characterized by electron microscopy (HRTEM, SEM), FT-IR, XRD and XPS. The Pd-rGO-H2 catalyst was found to possess excellent catalytic activity and recyclability in the Suzuki cross-coupling reaction under mild reaction conditions.
- Hussain, Najrul,Borah, Ashwini,Darabdhara, Gitashree,Gogoi, Pranjal,Azhagan, Vedi Kuyil,Shelke, Manjusha V.,Das, Manash R.
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p. 6631 - 6641
(2015/08/06)
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- Synthesis of regioisomeric naphtho-furans via naphthyloxyalkanals
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A new route to the regioisomeric 2-alkylnaphtho[2,1-b]- and 2-alkylnaphtho[1,2-b]furans via acid-catalyzed cyclization of the corresponding 2-naphthyloxyalkanals under mild conditions over Amberlyst 15 resin has been described. The 2-naphthyloxyalkanals w
- Kwiecien,Witczak,Kowalewska,Augustyniak
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experimental part
p. 20 - 29
(2010/08/06)
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- Photolyses of (3-Naphthoxypropyl)-, (4-Naphthylbutyl)-, and (4-Naphthyl-4-oxobutyl)cobaloxime
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The cobalt-carbon bond of the titled compounds is photochemically cleaved to generate an organoradical and a cobaloxime(II) radical pair. 3-(1- or 2-naphtoxy)propyl, 4-(1- or 2-naphthyl)butyl, and 4-(1-or 2-napthyl)-4-oxobutyl radicals thus formed undergo three types of reactions: (a) hydrogen abstraction to give a saturated terminal, (b) hydrogen elimination to give a terminal olefin, and (c) substitution on the naphthalene ring.In benzene and radicals follow process b exclusively (the radicals from (3-(2-napthoxy)propyl)cobaloxime (1a), (3-(1-napthoxy)propyl)cobaloxime (2a), and (4-(1-napthyl)butyl)cobaloxime (2 b)) or preferentially (the radicals from (4-(2-napthyl)butyl)cobaloxime (1 b), (4-(2-napthyl)-4-oxobutyl)cobaloxime (1c), and 4-(1-napthyl)-4-oxobutyl)cobaloxime (2c)).In chloroform, process a becomes important to the extent as the sum of the other two processes.In water-acetonitril (4:1), process c becomes important and even takes precedence of others for the radicals from 1b and 1c.This feature is accounted for by the folding of the side chain of hydrophobic radicals.Encapsulation of the radicals in β-cyclodextrin stimulates process c except for the case of the radical from 2c.In the case of cobaloxime 2c, α-cyclodextrin does not effect the partition process of the intermediate radical.This feature is accounted for by the shallow inclusion of the radical due to the hydrogen bonding as depicted in Figure 1d.
- Tada, Masaru,Hiratsuka, Mitsunori,Goto, Hiroyuki
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p. 4364 - 4370
(2007/10/02)
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- Acylation of naphthalenes
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Naphthalene substituted in the 2- or β-position with an electron-donating substituent can be acylated with high regioselectivity in the 6-position by using an acylating agent in substantially anhydrous hydrogen fluoride which functions both as catalyst and solvent.
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