22874-80-2Relevant academic research and scientific papers
Preparation of α-methylene-γ butyrolactones with difluoromethylene functionalities
Fukuda, Hiroshi,Kitazume, Tomoya
, p. 275 - 285 (1997)
4-(1,1-Difluoro-2-ethoxycarbonyl)methyl-γ-butyrolactone (1) was prepared from the Reformatsky-type reaction of n-butyl 3-formylpropanoate with ethyl bromodifluoroacetate in Zn-THF system, and compound (1) was converted to α-methylene-γ-butyrolactone derivatives with a difluoromethylene unit at γ-position.
Highly efficient phosphorescent materials based on Ir(III) complexes-grafted on a polyhedral oligomeric silsesquioxane core
Yu, Tianzhi,Xu, Zixuan,Su, Wenming,Zhao, Yuling,Zhang, Hui,Bao, Yanjun
, p. 13491 - 13502 (2016/09/04)
A new iridium(iii) complex containing a coumarin derivative as the cyclometalated ligand (L) and a carbazole-functionalized β-diketonate (Cz-acac-allyl) as the ancillary ligand, namely, Ir(iii) bis(3-(pyridin-2-yl)coumarinato-N,C4)(1-(9-butyl-9H-carbazol-3-yl)hept-6-ene-1,3-dionato-O,O) [Ir(L)2(Cz-acac-allyl)], was firstly synthesized as the emissive iridium(iii) complex. Then three new phosphorescent polyhedral oligomeric silsesquioxane (POSS) materials, consisting of the emissive Ir(iii) complex and carbazole moieties covalently attached to a polyhedral oligomeric silsesquioxane (POSS) core were successfully synthesized by hydrosilylation reaction in the presence of platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane (Pt-dvs) as the catalyst. These phosphorescent POSS materials offer many advantages including amorphous properties, good thermal stabilities, and good solubility in common solvents, and high purity via column chromatography. The photoluminescence spectra of the POSS materials in solution and in the solid state indicate a reduction in the degrees of interactions among the Ir(iii) complex units and concentration quenching due to the bulky POSS core. Solution processed light-emitting devices based on these phosphorescent POSS materials exhibit a maximum external quantum efficiency (EQE) of 9.77%.
Effective acceleration of atom transfer carbonylation of alkyl iodides by metal complexes. Application to the synthesis of the hinokinin precursor and dihydrocapsaicin
Fukuyama, Takahide,Nishitani, Satoshi,Inouye, Takaya,Morimoto, Keisuke,Ryu, Ilhyong
, p. 1383 - 1386 (2007/10/03)
Atom transfer carbonylation (ATC) of alkyl iodides leading to carboxylic acid esters is effectively accelerated by Pd(PPh3)4 and Mn2(CO)10 under photoirradiation conditions. In the presence of amines, Pd(0) complexes affected double carbonylations leading to α-keto amides, whereas Mn2(CO)10 accelerated only a single carbonylation reaction leading to the corresponding amides. The Pd(0)-accelerated ATC system was successfully applied to the synthesis of hinokinin and dihydrocapsaicin.
