phenylene

Phenylene, biphenylene or naphthalene; or b.

If, however, the phenylene rings are para-oriented, the chains retain their axial symmetry and can crystallize more readily.

The phenylene group (CH) is based on a di-substituted benzene ring (arylene).

Methyl, tertiary-butyl or phenyl substituted phenylene, biphenylene or naphthalene; and 2.

This protocol allows thiophene, pyridine, and ferrocene units to be accommodated in phenylene ethynylene arrays.

The Sonogashira coupling is applied in the synthesis of cross-conjugated oligo(phenylene enynylene)s and phenanthroline derivatives.

PAEK plastics are characterized by phenylene rings that are linked via oxygen bridges (ether and carbonyl groups (ketone)).

Structurally speaking, the colorless isomers of benzopyrene are pentacyclic hydrocarbons and are fusion products of pyrene and a phenylene group.

An example of such pair is the miscible resin NORYL , a mix of poly(phenylene oxide) and polystyrene.

Ogoshi and coworkers reported the synthesis of a pillar[6]arene with 1,4-Bis(methylcyclohexyl ether)phenylene units in an 87% yield by using chlorocyclohexane as the solvent.

We discuss the widening of the dipolar splittings of phenylene protons due to terminal proton groups, which results in the incorrect measurements of the degree of order.

Going from CPC to CTC, the replacement of a phenylene ring by a thiophene unit induces a red shift in the absorption and fluorescence spectra.

The theory was that the π-π interaction between the aromatic analytes and the phenylene bridge of the PMO framework leads to stronger retention and hence better separation.

For this the police have settled on a compound called Tenax G C (poly p 2.6. diphenyl phenylene oxide) which has the advantage that it does not mix with water.

Phenylene or alkylphenylene ethers or thio-ethers, or their mixtures, containing more than two ether or thio-ether functions or mixtures thereof; or 2.

In one such system one macrocycle is an electron deficient oligo Bis-bi pyridinium ring and the other cycle is crown ether cyclophane based on para phenylene or naphthalene.

In a study of a group of phenalene compounds it was concluded from Brønsted analysis that phenalene acidity is very different from either indene acidity or phenylene acidity .

The phenylene rings in this molecule are free to rotate forming a set of conformers: one with a Möbius half-twist and another with a Hückel double-twist (a figure-eight configuration) of roughly equal energy.

An arylene or arenediyl is a substituent of an organic compound that is derived from an aromatic hydrocarbon (arene) that has had a hydrogen atom removed from two ring carbon atoms, such as phenylene.

The Description of Goods of tariff item No. 5503.90.10 is amended by adding, in alphabetical order, a reference to "Solely of poly (phenylene sulphide) fibres for use in the manufacture of staple fibre yarn;".

The car synthesized has a helicene-derived engine with an oligo (phenylene ethynylene) chassis and four carborane wheels and is expected to be able to move on a solid surface with scanning tunneling microscopy monitoring, although so far this has not been observed.

The pilot atom for one of the five planes of chirality in pillar[5]arene is assigned to the highest priority atom that is not in the chiral plane - the first carbon atom of the neighboring phenylene unit.

To assess their ability to associate and to direct the formation of extended hydrogen-bonded networks, we examined the structure of crystals of four compounds in which two neutral biguanide groups or the corresponding cations are attached to the 1,4- and 1,3-positions of phenylene spacers.

The three adjacent in-plane atoms are then assigned, starting with the methylene carbon attached to the pilot atom as priority 1, and the directly connected phenylene carbon as 2, and the carbon atom connected to the methoxy group as 3.