16917-35-4Relevant articles and documents
A stable β-silyl carbocation with allyl conjugation
Lambert, Joseph B.,Liu, Chunqing,Kouliev, Timur
, p. 667 - 671 (2002)
Phenyl group replaced by a double bond yielding a stable β-silyl carbocation was studied. Two systems were examined in which positive charge could be stabilized by one phenyl and one double bond or two double bonds. The carbocation was found to be stable at room temperature with tetrakis(pentafluorophenyl)borate as the anion benzene as the solvents. The range of β-silyl carbocations observed under stable ion conditions was relatively circumscribed.
Formation of nanoarchitectures including subnanometer palladium clusters and their use as highly active catalysts
Okamoto, Kuniaki,Akiyama, Ryo,Yoshida, Hisao,Yoshida, Tomoko,Kobayashi, Shu
, p. 2125 - 2135 (2005)
Subnanometer Pd clusters stabilized within micelles of random copolymers were formed by direct immobilization of Pd(0) via ligand exchange. The clusters were estimated to contain approximately seven Pd atoms on average (cluster diameter ≈ 0.7 nm). Several
Reactivities of Stable Rotamers. XXXI. Bromine Addition to the Olefinic Moiety of Rotameric 1-(9-Fluorenyl)-2-(1-methylethenyl)naphthalenes
Oki, Michinori,Shionoiri, Katsumi,Otake, Katsumasa,Ono, Masaru,Toyota, Shinji
, p. 589 - 597 (1993)
Reaction of bromine with the ap form of the title compound afforded a normal addition compound, whereas the same with the sp form did no addition compound but a pair of bromo-olefins and a cyclized product, formation of which can be rationalized by deprotonation from and by attack of the ?-system of the fluorene group on the intervening cation.The abnormal reactions of the sp form are the consequence of the steric effects of the fluorene moiety that prohibits the formation of the tetrahedral carbon at the reaction site.The stereochemistry of the cyclized product was determined both by NOE experiments and by X-ray crystallography.The stereoselective formation of only one isomer was rationalized by the structure of the starting material, of which stereodynamics was studied by the dynamic NMR method, and the direction of the attack of the bromine cation.For comparison of the fate of the intervening cation, the adduct from the ap form was treated with silver p-toluenesulfonate.It was found that the ratios of olefin formation were different from one rotamer to another.The results are discussed on the basis of different degree of openness of the intervening bromonium cation with reference to the same reaction for (1,2-dibromo-1-methylethyl)benzene.
Iron-Catalyzed Regioselective Alkenylboration of Olefins
Yu, Xiaolong,Zheng, Hongling,Zhao, Haonan,Lee, Boon Chong,Koh, Ming Joo
, p. 2104 - 2109 (2020/11/30)
The first examples of an iron-catalyzed three-component synthesis of homoallylic boronates from regioselective union of bis(pinacolato)diboron, an alkenyl halide (bromide, chloride or fluoride), and an olefin are disclosed. Products that bear tertiary or quaternary carbon centers could be generated in up to 87 % yield as single regioisomers with complete retention of the olefin stereochemistry. With cyclopropylidene-containing substrates, ring cleavage leading to trisubstituted E-alkenylboronates were selectively obtained. Mechanistic studies revealed reaction attributes that are distinct from previously reported alkene carboboration pathways.
Highly selective hydrosilylation of equilibrating allylic azides
Liu, Ruzhang,Liu, Yongmei,Wang, Juan,Wei, Zhen,Xue, Huaiguo
supporting information, p. 5038 - 5041 (2020/05/18)
The Pt-catalyzed hydrosilylation of equilibrating allylic azides is reported. The reaction provides only one out of four possible hydrosilylation products in good yields and with very high chemoselectivity (alk-1-enevs.alk-2-ene), regioselectivity (linearvs.branched), and excellent functional group tolerance.
