An intrinsically microporous fluoropolymer has been successfully synthesized through thermo-cross-linking of a functional monomer having quaternary carbon center and thermopolymerizable trifluorovinyl ether groups as the side chains. Because tetrahedral configuration, produces spontaneously formed micropores with an average size 8 Å in polymer. existence micropores, exhibits excellent dielectric properties constant (Dk) 2.36 dissipation factor (Df) 1.29 × 10–3 at frequency 5 GHz. Moreover,...

A new fluorinated poly(aryl ether) with reactive benzocyclobutene groups as the side chain was successfully synthesized. This polymer showed a number-average molecular weight (Mn) of 200 000 and had good solubility film-forming ability. After being postpolymerized at high temperature (>200 °C), film converted to cross-linked network structure, which insoluble in common organic solvents. Such results suggest that postpolymerization is an efficient way achive balance between solvent resistance...

Siloxane-based polymer films obtained by the sol–gel process are often porous and exhibit low refractive indices. To address this issue, we have prepared two intrinsic high index siloxane–sulfide networks via Piers–Rubinsztajn reaction thiol–ene click chemistry based on readily available tetraethoxysilane (TEOS). Our polymers consisting of aromatic groups sulfur display enhanced thermostability with Tg (>120 °C) T5d (>320 as compared to related materials. Such good thermal properties...

A novel organosiloxane containing a thermally cross-linkable benzocyclobutene group was successfully synthesized through one-pot Grignard reaction procedure.

The conversion of a biorenewable plant oil (anethole) to new fluoropolymer with both low dielectric constant and water uptake is reported here. First, cationic polymerization by using CF3SO3H as an initiator gave polymer, which was then functionalized introducing the thermocrosslinkable -OCF═CF2 groups via three-step procedure. obtained can be easily thermally converted infusible insoluble cross-linked network exhibiting (<0.24%, in 96 °C for 4 days) (<2.64 at range frequencies varying from...

Polymers with both low water uptake and a dielectric constant have seen interest from the electronic microelectronic industries for several years. They play crucial role in maintaining good operating situation of devices, whereas most other materials are unsatisfactory. In this contribution, two new fluoropolymers reported, which derived thermo‐crosslinking reaction functional monomers containing perfluorocyclobutane benzocyclobutene moieties. These polymers show ranging 0.11 to 0.31% after...

Anethole, a naturally occurring aromatic compound which can be extracted abundantly from plants like star anise, fennel and basil, has been conveniently transformed to functional monomer in an overall yield of 81% <italic>via</italic> two-step procedure.

A high performance polymer with both low water uptake and thermostability derived from a biorenewable plant oil (anethole) is reported here. By using the as feedstock, new monomer containing benzocyclobutene vinyl units was successfully synthesized. The then converted to via radical polymerization, further postpolymerized form an insoluble infusible cross-linked network at temperature (>200 °C). exhibited of below 0.40% (kept boiling for 4 days) dielectric constant less than 2.9 range...

A thermally cross-linkable molecule composed of bis(trifluoromethyl)benzene and benzocyclobutene units (F1) was successfully prepared. Heating F1 (>200 °C) gave a cured resin, which showed dielectric constant (k) 2.47 at 30 MHz an average k value less than 2.51 in range frequencies from 0.15 to MHz. Such low values are comparable other polymeric low-k materials. For comparison, perfluorobenzene with groups (F2) also synthesized. The F2 exhibited 2.98, indicating that the introduction...

A new benzocyclobutene monomer with a fluorene backbone was synthesized, which can be thermally converted to cross-linked network low dielectric constant and high thermostability.

The enantioselective 1,3-dipolar cycloaddition of alkynes and α-aliphatic nitrones has long been recognized as an important challenge, while considerable progress made for the alkenes aromatic nitrones. We herein report example earth-abundant iron-catalyzed click-approach nonterminal alkynyl imides nitrones, highly functionalized chiral 4-isoxazolines having a 3-alkyl-substituted stereogenic carbon center are modularly generated in up to >99% yield 98% ee (54 examples). Although steric bulk...

Owing to their important application in the production of high performance materials, aromatic diamines have received interest many areas for several years. However, most polymers derivated from show poor processability due rigid backbone. Although much effort has been made, a balance between solvent (or heat)‐resistance and still needs be achieved. In this contribution, new diamine is reported, which both reactive amine groups thermo‐polymerizable benzocyclobutene moieties. Starting can not...

The trivalent phosphine-catalyzed [4+1] spiro-annulation reaction of allenyl imide and activated methylene cyclocompounds has been developed for the construction various spiro-2-cyclopenten-1-ones. Oxindoles, 3-isochromanones, 2-indanones are selected as 1C synthons to capture in situ-generated bis-electrophilic α,β-unsaturated ketenyl phosphonium intermediate, affording corresponding monospiro- bispiro-cyclopentenones good excellent yields (≤91%) under mild conditions. primary attempt at...

A polymer based on trifluoromethyl-substituted arene was synthesized with high molecular weight (<italic>M</italic>_n) of 62 000 by the Scholl reaction. The film showed low dielectric constants about 2.56 in a range frequencies from 1 to 25 MHz. Moreover, revealed thermostability and good mechanical properties, suggesting that had potential applications electronics industry.

A series of new thermo-cross-linkable polymers with both excellent transparency and thermostability derived from a biorenewable plant oil (anethole) are reported here. By using the as feedstock, monomer (anethole-based acrylate) containing propenyl acryloyl functional units is successfully synthesized via simple two-step reaction route. Copolymerizing methyl acrylate (MA) in presence radical initiator gives copolymers, which postpolymerized at high temperature to form polymers, exhibiting...

Using a pincer platform based on bridgehead NHC donor with functional side arms, the combined effect of increased flexibility in six-membered pyrimidine-type heterocycles compared to more often studied five-membered imidazole, and rigidity phosphane arms was examined. The unique features observed include: 1) reaction azolium Csp2 -H bond [Ni(cod)2 ] affording carbanionic ligand [NiCl(PCsp3H P)] (8) rather than carbene; 2) its transformation into NHC, hydrido complex [NiH(PCNHC P)]PF6 (9)...

We report the first examples of metal-promoted double geminal activation C(sp

Abstract The development of efficient synthetic strategies for the preparation tetrasubstituted N−H pyrrole derivatives, especially in an environmentally benign fashion is important yet challenging. Herein, we report a copper(II)‐catalyzed tandem reaction involving 1,3‐dipolar cycloaddition α,β‐ynones and glycine iminoesters, followed by copper(II)‐promoted oxidative (air) dehydrogenative aromatization, allowing de novo access to pyrroles up 81 % yield under green conditions. A possible...

Whereas the bis(imine)imidazolium salt 1·Cl yielded with [Pt(cod) 2 ] Pt II -hydrido NHC complex 3, unprecedented, tetrahedral cluster [Pt 4 (μ-H)(cod) ]BF (7) was unexpectedly obtained from 1·BF .

Back Cover: A novel aromatic diamine having both reactive amine groups and a directly thermo-polymerizable benzocyclobutene moiety is used to modify the properties of conventional polyimides, making great improvement polyimides. Further details can be found in article by Yijie Luo, Jing Sun, Jiajia Wang, Kaikai Jin, Fengkai He Qiang Fang* page 856.

Acyclic aldehydes containing a chiral all-carbon quaternary center at the α-position are important synthons for pharmaceuticals and natural products.The challenges such as steric congestion conformational flexibility in acyclic systems must be overcome, which constitutes to hot difficult topic field of asymmetric catalysis.Such type structural motif is mainly accessed from α-C-H functionalization tertiary via enamine catalysis or based on enolate chemistry.Desymmetric tandem strategies have...