Variable temperature 1H NMR data for the ethyl substituted ligand 7b (Figure 7) show that signals resolve as the temperature is increased, confirming that the observed line broadening arises due to slow conversion between amide conformational isomers at room temperature. For example the signal at ,...
In THF 1 exists as a 1:1 mixture of the cis and trans isomers,... MA Paver,DS Wright,D Stalke - 《Angewandte Chemie International Edition in English》 被引量: 28发表: 1993年 Synthesis of gold ferrocenyl substituted ylides and methanides: crystal structure of [FcCH(AuPPh_3)PPh_3]...
Also, compared to those of 1 and 2, further downfield shifts of the remaining signals were observed (Figure S3). The 1H-NMR spectra of thiadiazole derivatives 1–3 revealed the presence of additional set of low intensity signals identified as originating from a series of isomers, which may ...
(II) as thed10metal center and, as the flexible organic ligand, the tecton, 5-methyl-1-(pyridine-3-ylmethyl)-1H-1,2,3-triazole -4-carboxylate (NaL1), and 5-methyl-1-(pyridin-4-ylmethyl)-1H-1,2,3-triazole -4-carboxylate (NaL2) two positional isomers. These two ligands have a ...
Four isomers of dihydroxyl FLP and two isomers of hydroxylimide FLP were found from the direct photolysis of FLP. Additionally, mono, di, and trihydroxyl lactam PPs were successfully elucidated by using retention times, fragmentation patterns, isotopic peaks, and HRMS accurate mass measurements. ...
The fluorinated naphthols 5c and 5d were achieved in good overall yield and a 5:1 ratio of the para:meta isomers, respectively. Ring fluorination was confirmed by the observation of resonances in the 19F NMR spectra as singlets: −134.0 ppm (1F) and −134.2 ppm (1F) for 5c and 5d...