Zirconocene Ketimides: Synthesis, Structural Characterization, Ethylene Polymerization Activity, and ab Initio Computational Studies

2000 ◽  
Vol 19 (21) ◽  
pp. 4369-4375 ◽  
Author(s):  
David R. Armstrong ◽  
Kenneth W. Henderson ◽  
Ian Little ◽  
Charles Jenny ◽  
Alan R. Kennedy ◽  
...  
Author(s):  
Mary Marshall ◽  
Zhaoguo Zhu ◽  
Junzi Liu ◽  
Lan Cheng ◽  
Kit H. Bowen

2011 ◽  
Vol 100 (6) ◽  
pp. 2321-2332 ◽  
Author(s):  
Giovanna Bruni ◽  
Fabia Gozzo ◽  
Doretta Capsoni ◽  
Marcella Bini ◽  
Piero Macchi ◽  
...  

1995 ◽  
Vol 117 (50) ◽  
pp. 12489-12497 ◽  
Author(s):  
Timothy L. Stemmler ◽  
Terence M. Barnhart ◽  
James E. Penner-Hahn ◽  
Charles E. Tucker ◽  
Paul Knochel ◽  
...  

1993 ◽  
Vol 71 (8) ◽  
pp. 1123-1127 ◽  
Author(s):  
Peter Politzer ◽  
M. Edward Grice ◽  
Jane S. Murray ◽  
Jorge M. Seminario

Ab initio computational studies have been carried out for three molecules that are commonly classed as antiaromatic: cyclobutadiene (1), 1,3-diazacyclobutadiene (7), and 1,4-dihydropyrazine (6). Their dinitro and diamino derivatives were also investigated. Stabilizing or destabilizing energetic effects were quantified by means of the isodesmic reaction procedure at the MP2/6-31G*//HF/3-21G level, and calculated molecular electrostatic potentials (HF/STO-5G//HF/3-21G) were used as a probe of electron delocalization. Our results do not show extensive delocalization in the π systems of any one of the three parent molecules. The destabilization found for 1 and 7 is attributed primarily to strain and to repulsion between the localized π electrons in the C=C and C=N bonds, respectively. However, 6 is significantly stabilized, presumably due to limited delocalization of the nitrogen lone pairs. NH2 groups are highly stabilizing, apparently because of lone pair delocalization. NO2 is neither uniformly stabilizing nor destabilizing.


ChemInform ◽  
2013 ◽  
Vol 44 (1) ◽  
pp. no-no
Author(s):  
Carola J. Mueller ◽  
Sven Lidin ◽  
Susana Ramos de Debiaggi ◽  
Crispulo E. Deluque Toro ◽  
Armando Fernandez Guillermet

2020 ◽  
Vol 206 ◽  
pp. 111043
Author(s):  
Luis Felipe Hernández-Ayala ◽  
Yanis Toledano-Magaña ◽  
Luis Ortiz-Frade ◽  
Marcos Flores-Alamo ◽  
Rodrigo Galindo-Murillo ◽  
...  

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