138771-00-3

Upstream product

• 201230-82-2 carbon monoxide 
• 101-81-5 Diphenylmethane 
• 38059-08-4 bis<(2-hydroxymethyl)phenyl>methane 
• 256-81-5 suberene 
• 123335-02-4 bis-(2-bromophenyl)methanol 
• 61592-89-0 2,2’-dibromodiphenylmethane 
• 68-12-2 N,N-dimethyl-formamide 
• 6630-33-7 ortho-bromobenzaldehyde 
• 583-53-9 2,3-dibromobenzene 
• 142066-41-9 2-(chloromethyl)-phenyl methanol 
• 612-14-6 phthalyl alcohol 
• 2222-33-5 dibenzosuberenon 

Downstream Products

• 38059-08-4 bis<(2-hydroxymethyl)phenyl>methane 

Relevant academic research and scientific papers

Fast Photochromism of the Imidazole Dimers Bridged by Group 14 Atoms

We developed fast photochromic imidazole dimers bridged by group 14 atoms. These compounds reversibly break the C-N bond to generate the colored open-ring biradical form. The colored form thermally reproduces the initial colorless form in the microsecond

The first efficient synthesis and optical resolution of monosubstituted cyclotribenzylenes

A new and high yielding synthetic route to monosubstituted cyclotribenzylenes 6 via the cyclocondensation of benzene with a suitably monosubstituted diol 20, obtained from ozonolysis of the corresponding dibenzosuberene precursor 19, was developed for the first time! The dibenzosuberene itself could be readily prepared in large quantities from inexpensive starting materials in five steps. Using this synthetic approach, a mono bromosubstituted cyclotribenzylene 12a was synthesized on large scale. Another four monosubstituted cyclotribenzylenes 21-24 were also prepared either via bromine/lithium exchange followed by subsequent quenching with external electrophiles or a copper mediated reaction with cyanide. These molecules adopt a rigid crown conformation as shown by X-ray analysis and temperature dependent NMR studies. The barrier to inversion is quite high, requiring temperatures well above 120°C before inversion takes place. Futhermore, such monosubstituted cyclotribenzylenes are planar chiral and after optical resolution, using HPLC, we were able to obtain the first planar chiral Cl-symmetric cyclotribenzylenes in form of the optically pure enantiomers of 12a, the CD spectra of which are exact mirror images over the entire spectral range.

Orthocyclophanes. 1. Synthesis and Charaterization of 4>- and 5>Orthocyclophanes and Bicyclic Biscyclophanes

4>- and 5>orthocyclophanes have been designed, synthesized and characterized.Dimetalation of bis(2-bromophenyl)methane (14) to the corresponding dilithio reagent 21, followed by reaction with aromatic dialdehydes bis(2-formylphen