27299-30-5Relevant academic research and scientific papers
Cobalt-Catalyzed Ligand-Controlled Regioselective Hydroboration/Cyclization of 1,6-Enynes
Xi, Tuo,Lu, Zhan
, p. 1181 - 1185 (2017/08/09)
A ligand-controlled cobalt-catalyzed regioselective hydroboration/cyclization of 1,6-enynes with HBPin was developed by switching the size of the coordinated side arm to afford alkenylboronates and alkylboronates, respectively. Gram-scale reactions could be easily conducted, which is beneficial for further derivatizations. A primary mechanism was proposed on the basis of substrate-controlled experiments and deuterium experiments.
Catalytic Semireduction of Internal Alkynes with All-Metal Aromatic Complexes
Deyris, Pierre-Alexandre,Ca?eque, Tatiana,Wang, Yanlan,Retailleau, Pascal,Bigi, Franca,Maggi, Raimondo,Maestri, Giovanni,Malacria, Max
, p. 3266 - 3269 (2015/10/28)
A simple catalytic method involving all-metal aromatic frameworks as precatalysts ensures an efficient route to (Z)-alkenes. Aromatic triangular palladium clusters were used to reduce internal alkynes without any trace of the formation of alkane side products. These trinuclear complexes provide a catalytic system that parallels the activity and selectivity of their best mononuclear peers, and the catalyst likely operates through complementary mechanisms.
Hydroindation of allenes and its application to radical cyclization
Hayashi, Naoki,Hirokawa, Yusuke,Shibata, Ikuya,Yasuda, Makoto,Baba, Akio
supporting information; experimental part, p. 1949 - 1954 (2009/01/31)
Hydroindation of allenes and radical cyclization of 1,2,7-trienes (allenenes) were accomplished by HInCl2 with high regioselectivity to afford a variety of cyclic compounds. The resulting vinylic indiums could be used for successive coupling reactions in a one-pot procedure. The use of HInCl2 generated slowly in situ is extremely effective for the radical cyclization. The Royal Society of Chemistry.
Encapsulated molecular catalysts in polysiloxane gels: Ruthenium cluster-catalyzed isomerization of alkenes
Motoyama, Yukihiro,Abe, Motonori,Kamo, Kazuyuki,Kosako, Yusuke,Nagashima, Hideo
supporting information; experimental part, p. 5321 - 5323 (2009/03/11)
Novel ruthenium-encapsulating polysiloxane gels are prepared by treatment of polymethylhydrosiloxane with diols in the presence of (μ3, η2,η3,η5-acenaphthylene)Ru 3(CO)7, and act as reusable catalysts in the isomerization of alkenes without leakage of the catalyst species. The Royal Society of Chemistry.
Hydrogenation versus hydrogenolysis with a safe, selective and reusable catalyst: Palladium black on Teflon
Belotti, Damien,Cantagrel, Guillaume,Combellas, Catherine,Cossy, Janine,Kanoufi, Frederic,Nunige, Sandra
, p. 761 - 764 (2007/10/03)
Palladium black deposit is obtained by reduction and metallization of the Teflon polymer surface of magnetic stirring bars. These stirring bars can be used to perform selective hydrogenation of olefins and acetylenic compounds whilst hydrogenolysis is not observed. The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2005.
Iridium-catalyzed intermolecular allylic etherification with aliphatic alkoxides: Asymmetric synthesis of dihydropyrans and dihydrofurans
Shu, Chutian,Hartwig, John F.
, p. 4794 - 4797 (2007/10/03)
Hindered chiral ethers with one or two stereocenters are now readily available by allylic etherification of primary and secondary alkoxides (see reaction). When an Ir-phosphoramidite complex is used as the catalyst, the reaction proceeds with high regio-, enantio-, and diastereoselectivity. Np = 1-naphthyl.
Study of the stability of carbocations by chlorosulfonyl isocyanate reaction with ethers
Kim, Ji Duck,Han, Gyoonhee,Jeong, Lak Shin,Park, Hyun-Ju,Zee, Ok Pyo,Jung, Young Hoon
, p. 4395 - 4402 (2007/10/03)
The stability order of various alkyl, allyl, and benzyl carbocations was investigated using the novel technique for comparing the stability of carbocations in solution developed by using a simple CSI reaction with various ethers. The p-methoxycinnamyl carbocation was the most stable in our reaction system and the next stable carbocation was the p-methoxybenzyl carbocation. The stability of the other carbocations decreased with methacryl, t-butyl, cinnamyl, acryl, benzyl, 2° and allyl carbocations in that order.
Bismuth Bromide-Catalyzed reductive coupling of carbonyl compounds and its application to the synthesis of novel crownophanes
Komatsu, Naoki,Ishida, Jun-Ya,Suzuki, Hitomi
, p. 7219 - 7222 (2007/10/03)
The reductive homocoupling of carbonyl compounds and heterocoupling of a carbonyl compound with an alkoxysilane were both effected smoothly with triethylsilane in the presence of a catalytic amount of bismuth bromide (1-3 mol%) under mild conditions. This ether-forming reaction was successfully applied to the single-step preparation of novel crownophanes with olefinic or acetylenic linkages.
Chemoselective removal of allylic formyloxy group using SmI2
Shibuya,Shiratsuchi
, p. 431 - 449 (2007/10/02)
A variety of allylic formates are chemoselectively transformed into th corresponding olefins in excellent yields on treatment with SmI2 in THF-HMPA-H2O (20:5:1), even though allylic acetate and allylic ether groups are present in the same molecule.
