Branched polyphenylenes and phenylene dendrimers: NMR and optical studies

Aromatic Dendrimers Bearing 2,4,6-Triphenyl-1,3,5-triazine Cores and Their Photocatalytic Performance

“…The first reports on the synthesis of 1 were published in 1973–2003. 18 − 22 Since then many interesting examples of the respective low-generation aromatic dendrimers showing beneficial light-emission-related features were reported, as discussed above. However, we have noted that the synthesis of (2,4,6-triphenyl-1,3,5-triazine)-containing dendrimers D1 and D2 ( Figure 1 ), which can be claimed as directly structurally derived from 1 , were not reported to date.…”

“…We envisioned that from the structural viewpoint, 1,3,5-tri­[1,3-diphenyl­(phenyl-5-yl)­phenyl-4′-yl]­benzene ( 1 ; Figure ) can be termed as a very original structure for the works dealing with the preparation of aromatic dendrimers consisting of 2,4,6-triphenyl-1,3,5-triazine cores. The first reports on the synthesis of 1 were published in 1973–2003. − Since then many interesting examples of the respective low-generation aromatic dendrimers showing beneficial light-emission-related features were reported, as discussed above. However, we have noted that the synthesis of (2,4,6-triphenyl-1,3,5-triazine)-containing dendrimers D1 and D2 (Figure ), which can be claimed as directly structurally derived from 1 , were not reported to date.…”

Branched Oligophenylenes with Phenylene‐Ethynylene Fragments for Optoelectronics

“…To facilitate the distinction of proton signals in the 1 H NMR spectra of the polymers, we analized the spectra of the model compound – cyclotrimer 1,3,5‐tris (diphenylacetylene‐4‐yl)benzene ( 3 ) . 1 H NMR spectrum of compound 3 (Figure ) has signals of 1,3,5‐trisubstituted benzene ring (s, 7.88 ppm), p‐substituted benzene rings (AB‐q, 7.68–7.81 ppm) and terminal phenyl groups [(m, 7.40–7.48 ppm) and (m, 7.60–7.68 ppm)].…”

Synthesis and Reactivity of 5-Heterotruxenes Containing Sulfur or Nitrogen as the Heteroatom

“…The direct application of the methods used during the cyclotrimerization of acetophenone, for example, condensation in the presence of ethyl orthoformate and hydrogen chloride did not lead to satisfactory yields (Table 1). 51 One of the factors affecting the result of the reaction is the lower reactivity of the ketone 11, compared to acetophenone; therefore, the use of a stronger acid should generate enol form 11′ in a higher concentration, increasing the condensation yield. Chlorosulfonic acid plays a double role in the cyclotrimerization reaction.…”