826-62-0Relevant articles and documents
STEREOREGULAR FLUOROPOLYMERS: 6. THE RING-OPENING POLYMERIZATION OF N-PENTAFLUOROPHENYLBICYCLOHEPT-5-ENE-2,3-DICARBOXIMIDE
Blackmore, P. M.,Feast, W. J.
, p. 331 - 348 (1988)
Exo-N-pentafluorophenylbicyclohept-5-ene-2,3-dicarboximide (I) readily undergoes metathesis ring-opening polymerization when exposed to conventional metathesis catalysts such as WCl6/Me4Sn and MoCl5/Me4Sn; by contrast, its endo isomer (II) is not homopolymerized but can be copolymerized with (I).The microstructures of the resulting polymers are established and discussed.
ROMP polymer supported manganese porphyrins: Influence of C[dbnd]C bonds along polymer chains on catalytic behavior in oxidation of low concentration Fe2+
Li, Fanfan,Wang, Xuan,Zhang, Yanwu,Zhao, Huanhuan
, (2020/02/22)
One unsaturated polymer support was prepared through ring opening metathesis polymerization (ROMP) of norbornene-2,3-dip-toluene sulfonate initiated by Grubbs 2nd initiator and manganese porphyrins were immobilized on polymer through transesterification reaction. To investigate the effect of C[dbnd]C bonds along polymer chains on the catalytic behavior, the obtained polymer supported catalyst (P-PPIXMnCl) was applied in oxidation of low concentration Fe2+ to mimic catalytic behavior of Ceruloplasmin. In the presence of P-PPIXMnCl, the conversion of Fe2+ reaches to 91.92% and 96.46% at 10 °C and 37.5 °C (body temperature), respectively. Compared to manganese porphyrins, P-PPIXMnCl can dramatically increase oxidation rate of Fe2+ and the catalytic kinetic shows that the oxidation reaction changes from second-order to third-order. Upon hydrogenation of ROMP polymer, the oxidation reaction still conforms to the second-order kinetics. Density functional theory (DFT) calculation shows that the C[dbnd]C bonds along polymer chains play an important role in the coordination with Fe2+ in the catalytic microenvironment. The real time morphology of supported catalysts in aqueous environment characterized by Cryo-TEM indicates that hydrogenation can shrink the morphology of polymer-water skeleton. The catalyst could be recycled six times without any significant loss in activity. The liner heterogeneous catalyst is expected to be used as drugs for treating excessive iron accumulation in the human body.
Synthetic method of aliphatic pentacyclic dianhydride
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Page/Page column 6-11, (2020/03/12)
The invention discloses a synthetic method of aliphatic pentacyclic dianhydride, and particularly relates to a synthetic method of pentacyclic [8.2. 1.14, 702, 903, 8] tetradecane-5, 6, 11, 12-tetracarboxylic dianhydride. The invention belongs to the field of preparation methods of fine chemicals. Maleic anhydride and cyclopentadiene are used as initial raw materials, an intermediate product norbornene dianhydride is synthesized through a 1, 4-addition reaction at a low temperature, then a solvent and a photocatalyst are added, the reaction process is monitored through HPLC under the illumination condition of a single-wavelength light source, and after the reaction is finished, a white solid is obtained through aftertreatment. The method disclosed by the invention is simple to operate, high in synthesis yield and few in byproducts.
A Crystalline Ready-to-Use Form of Cyclopentadiene
Krupp, Felix,He, Shiliang,Frey, Wolfgang,Richert, Clemens
supporting information, p. 1707 - 1710 (2018/07/03)
Cyclopentadiene (Cpd) is widely used as a starting material in organic and inorganic chemistry. In neat form, Cpd dimerizes, making it necessary to distill it prior to use to obtain fully reactive material. We have screened three different tetraphenyladamantane octaethers for their ability to act as encapsulating organic crystal (EnOC) hosts for Cpd. To this end, we also synthesized 1,3,5,7-tetrakis(3,5-dimethoxyphenyl)adamantane, a new octaether, dubbed iso -TDA. Only one of the octaethers was found to produce inclusion complexes with Cpd in the crystalline state. The encapsulated diene was stable for one month and showed full reactivity in a series of different synthetic transformations.
