28393-04-6Relevant articles and documents
Use of Imidazo[1,5-a]pyridin-3-ylidene as a Platform for Metal-Imidazole Cooperative Catalysis: Silver-Catalyzed Cyclization of Alkyne-Tethered Carboxylic Acids
Rawat, Vishal Kumar,Higashida, Kosuke,Sawamura, Masaya
supporting information, p. 1631 - 1637 (2021/02/03)
Silver complexes with 5-(4-(tert-butyl)-1H-imidazol-1-yl)-imidazo[1,5-a]pyridin-3-ylidene ligands were synthesized as metal-imidazole acid-base cooperative catalysts. Single crystal XRD analysis revealed that the silver atom was located in the vicinity of
Self-assembly and solid-state polymerization of butadiyne derivatives with amide and trialkoxyphenyl groups
Kikuchi, Kohei,Tatewaki, Yoko,Okada, Shuji
, p. 298 - 305 (2017/05/10)
Three butadiyne derivatives with amide and tri(dodecyloxy)-phenyl (TDP) groups were synthesized, and four solidification methods were applied to obtain their self-assembling states in various conditions. The solids obtained were characterized by the solid-state polymerization behaviors, stretching vibration wavenumbers of N-H bonds of amide groups, powder X-ray diffraction, the thermal behaviors, and scanning electron microscope (SEM) observations. We found that all compounds had at least two polymorphs. Property differences between two polymorphs depended on the compounds. Two compounds showed clear differences in UV-vis spectra of the photo-polymerized solids, i.e., the polydiacetylene (PDA) structure, and irregularly polymerized form, or two PDA structures. The remaining compound showed the same PDA absorption but the monomer melting points were different. All compounds gave the gels in various organic solvents because of the molecular design with amide and TDP groups. SEM observation clarified the relationship between gel appearance and the nanostructures.
Polydiacetylene paper-based colorimetric sensor array for vapor phase detection and identification of volatile organic compounds
Eaidkong, Thichamporn,Mungkarndee, Radeemada,Phollookin, Chaiwat,Tumcharern, Gamonwarn,Sukwattanasinitt, Mongkol,Wacharasindhu, Sumrit
experimental part, p. 5970 - 5977 (2012/06/18)
Detection and identification of VOCs in their vapor phase is essential for safety and quality assessment. In this work, a novel platform of a paper-based polydiacetylene (PDA) colorimetric sensor array is prepared from eight diacetylene monomers, six of which are amphiphilic and the other two are bolaamphiphilic. To fabricate the sensors, monomers are coated onto a filter paper surface using the drop-casting technique and converted to PDAs by UV irradiation. The PDA sensors show solvent induced irreversible color transition upon exposure to VOC vapors. When combined into a sensing array, the color change pattern as measured by RGB values and statistically analyzed by principal component analysis (PCA) is capable of distinguishing 18 distinct VOCs in the vapor phase. The PCA score and loading plots also allow the reduction of the sensing elements in the array from eight to three PDAs that are capable of classifying 18 VOCs. Utilizing an array containing only two PDAs, various types of automotive fuels including gasoline, gasohol and diesel are successfully classified. The Royal Society of Chemistry 2012.
Cyclization of alkynoic acids with gold catalysts: a surprising dichotomy between AuI and AuIII
Harkat, Hassina,Dembelé, Albert Yénimégué,Weibel, Jean-Marc,Blanc, Aurélien,Pale, Patrick
experimental part, p. 1871 - 1879 (2009/06/28)
ω-Acetylenic acids, substituted or not at their acetylenic end, could be efficiently cyclized to γ- or δ-alkylidene lactones in the presence of AuCl and K2CO3. In contrast AuCl3 led to lactone dimers, probably through cycl
