macrocycles

The concept is demonstrated in an illustrative example involving polyacetal macrocycles.

Polycycles and macrocycles can also be formed using radical cyclization reactions.

Another reported application is the synthesis of macrocycles via dithiol coupling.

The first and most extensively studied series of synthetic tetraaza macrocycles were initially prepared by Curtis.

His research interests include novel aromatic compounds, conjugated organic materials and macrocycles.

The interlocked rings cannot be separated without breaking the covalent bonds of the macrocycles.

Macrocycles can possess varying degrees of rigidity in their structure, making a single peripheral attack model difficult to apply to all systems.

They are distinct in terms of environment, economic resources, culture and more or less interdependent histories with often unsynchronized developmental macrocycles.

These approaches have been particularly successful in preparing unpredictable Catenanes and other complex macrocycles including a molecular knot.

Pillararenes are macrocycles composed of hydroquinone units (5 to 10) linked in the para position.

Thus porphyrin macrocycles are highly conjugated systems.

A catenane is a mechanically-interlocked molecular architecture consisting of two or more interlocked macrocycles.

Recently the terminology "mechanical bond" has been coined that describes the connection between the macrocycles of a catenane.

If this substituent is large enough to prevent rotation, optically active pillararene macrocycles can be isolated.

Ellagitannins generally form macrocycles, whereas gallotannins don't.

Porphyrazines, or tetraazaporphyrins, are tetrapyrrole macrocycles similar to porphyrins and phthalocyanines.

Pyrogallolarenes are related macrocycles derived from the condensation of pyrogallol (1,2,3-trihydroxybenzene) with an aldehyde.

All three are relatively large, circular-shaped molecules known as "macrocycles": porphyrin, chlorin, and bacteriochlorin.

It covers "research in the chemistry, physics, biology and technology of porphyrins, phthalocyanines and related macrocycles".

Given their high affinities to form inclusion complexes cucurbiturils have been employed as the macrocycles component of a rotaxane.

The lowest energy conformations of macrocycles also influence intramolecular reactions involving transannular bond formation.

Ogoshi named the new family of host macrocycles "pillararene", para-bridged pillar-shaped novel hosts.

Porphyrins have conjugated molecular ring systems (macrocycles) that appear in many enzymes of biological systems.

In the past, chemists making photo pigments have usually started with porphyrins, which are the easiest of the three types of macrocycles to synthesize.

The most stable rings contain five or six carbon atoms, but large rings (macrocycles) and smaller rings are common.