Binucleating multidentate amine bis(phenolate) ligands with rigid terphenyl backbones were designed to support two zirconium centers locked in close proximity. Polymerizations of propylene or 1-hexene with the synthesized bimetallic precatalysts resulted in polymers with significantly higher isotacticity (up to 79% mmmm) in comparison to the stereoirregular polymers produced with previously rep...

In the title compound, C(11)H(13)N(3)S, two of the C atoms of the cyclo-hexene ring and the methyl group attached to it are disordered over two sets of sites in a 0.544 (2):0.456 (2) ratio. The benzothiene and pyrimidine rings are almost coplanar with an angular tilt of 2.371 (9)° between them. The thio-phene ring is essentially planar (r.m.s. deviation 0.05 Å), while the cyclo-hexene ring in b...

In the title compound, C22H19NOS, the cyclo-hexene ring of the tetra-hydro-benzo-thio-phenyl ring system adopts a slightly distorted half-chair conformation and is twisted slightly [7.5 (8)° for the major disorder component] from the mean plane of the thio-phene ring. The dihedral angles between the mean planes of the thio-phene ring and the phenyl rings are 65.7 (3) and 8.3 (4)°. The phenyl ri...

In the title carbamate compound, C(17)H(23)NO(2), one of the Csp(3) atoms of the cyclo-hexene ring is disordered over two sites with refined occupancies of 0.55 (2) and 0.45 (2), both disorder components resulting in half-boat conformations. The mean plane through the carbamate unit is inclined at inter-planar angles of 14.80 (13), 18.30 (17) and 24.0 (2)°, respectively, with respect to the phe...

The six-membered N-heterocyclic ring of title compound, C(17)H(17)ClN(2)O, is fused with a methyl-substituted cyclo-hexene ring. The nitro-gen-bearing ring has an envelope conformation with the benzene ring-bearing C atom lying 0.432 (6) Å out of the plane defined by the other five atoms (r.m.s. deviation 0.011 Å); its benzene substituent is aligned at 84.7 (1)° to the latter plane. The cyclo-h...

The 4H-pyran ring of the title compound, C(17)H(16)N(2)O(2), is nearly planar [maximum deviation = 0.077 (2) Å] and the cyclo-hexene ring adopts a flattened chair conformation [puckering parameters: Q(T) = 0.435 (2) Å, θ = 122.0 (3)° and ϕ = 53.5 (3)°]. The 4H-pyran ring is almost perpendicular to the benzene ring [dihedral angle = 87.23 (8)°] and is almost coplanar with the mean plane of the c...

Copolymerization of ethylene with polar vinyl monomers to yield functionalized and possibly easier recyclable polyolefins is challenging it currently being pursued mainly using expensive Pd-based catalysts. Herein, the copolymerization methyl acrylate (MA) achieved by dibenzocycloheptyl-substituted aryliminopyridyl Ni(II) complexes, affording copolymers selectively in-chain incorporated MA unit...

Asymmetric amplification in the copolymerization of cyclohexene oxide and carbon dioxide was demonstrated using chiral zinc complexes, prepared from diethylzinc, diphenyl(pyrrolidin-2-yl)methanol, and ethanol.

The radical copolymerization of vinylidene fluoride (VDF) with 4-bromo-1,1,2-trifluorobut-

The preparation of several graft copolymers obtained by radiation induced graft copolymerization of typical monomers onto poly (3hydroxybutyrate) is reviewed. The general mechanisms by which graft copolymerization reaction proceed under various irradiation conditions are described. Main attention is given to the structure, properties, synthesis and characterization of the graft product, as well...