Equilibrium Acidities of Nitroalkanes in an Ionic Liquid
作者:Feixiang Gao、Pengju Ji、Jin-Pei Cheng
DOI:10.1021/acs.joc.8b02183
日期:2018.12.21
The acidity ladder scale in [BMPY][NTf2] was successfully expanded toward the weak acidity region for about five more pK units compared to the previously established one. This allows the acidities of a series of 13 aliphatic and aromatic nitroalkanes to be determined accurately by the UV–vis spectroscopic method. The acidity of nitroalkane in [BMPY][NTf2] covers ∼8 pK units and is significantly weaker
Free radical cyclizations leading to nitrogen heterocycles. II. 2-Phenylpyrazolidin-3-ones via tributyltin hydride reaction with alpha-bromoacylated phenylhydrazones
作者:John L. Belletire、Chad E. Hagedorn、Douglas M. Ho、Jeanette Krause
DOI:10.1016/0040-4039(93)89015-i
日期:1993.1
The unexpected observation of 2-phenylpyrazolidin-3-one formation during an attempted 4-exo Trig cyclization of an a-bromoacylated phenylhydrazone is a general reaction.
Thermal ring enlargement of aromatic cyclopentadienylidene iminyl radicals. Intramolecular radical addition to the N atom of nitriles results in high yields of aza-aromatics
作者:Jörg Hofmann、Kathrin Schulz、Gerhard Zimmermann
DOI:10.1016/0040-4039(96)00320-6
日期:1996.4
benz-anellated cyclopentadienones (fluorenone (9a), methanophenanthrenone (9b)), yield into phenanthridine (8a) and benzo[lmn]-phenanthridine (8b) in yields > 60%. The results point to a predominant addition of intermediately generated phenyl type radicals 5 to the N atom of the nitrile groups followed by bimolecular H-abstraction of the cyclic imidoyl radicals to 8 (scheme 3).
A structural study of dimethylaluminum carboxylato and hydrazonato complexes
作者:Diane A Dickie、Dharinee D Choytun、Michael C Jennings、Hilary A Jenkins、Jason A.C Clyburne
DOI:10.1016/j.jorganchem.2004.03.043
日期:2004.7
formation of the dialkylaluminum complexes [(CH3)2Alμ-O2CPh(Ph3)}]2 (4) and [Me2AlN(C6H5)NC13H8]2 (5). The synthesis of these complexes, as well as their spectroscopic and structuralcharacterization are reported. X-ray crystallographic studies show that the carboxylato complex4 adopts a dimeric structure containing an 8-membered O–Al–O–C core whereas the hydrazonato complex 5 likewise is dimeric in the