NMR Studies of Hindered Rotation in Cubic KCN

1968 ◽  
Vol 49 (10) ◽  
pp. 4721-4722 ◽  
Author(s):  
Eiichi Fukushima
Keyword(s):  
Nmr Studies ◽  
Hindered Rotation

NMR studies of hindered rotation and thermal decomposition of novel 1-aryl-3,3-dialkyltriazenes

1992 ◽  
Vol 30 (12) ◽  
pp. 1178-1185 ◽  
Author(s):  
Th. Lippert ◽  
A. Wokaun ◽  
J. Dauth ◽  
O. Nuyken
Keyword(s):  
Thermal Decomposition ◽  
Nmr Studies ◽  
Hindered Rotation

NMR Studies of Hindered Rotation of Unsubstituted Bridgehead Phenyl Rings in the Phencyclone - Norbornadiene Adduct

1993 ◽  
Vol 26 (1) ◽  
pp. 79-101 ◽  
Author(s):  
Laurine A. LaPlanche ◽  
Yangdong Xu ◽  
Ronnie Benshafrut ◽  
Robert Rothchild ◽  
Ernest A. Harrison
Keyword(s):  
Nmr Studies ◽  
Hindered Rotation ◽  
Phenyl Rings

NMR Studies of Drugs: Antipyrine and Analogs. I. Use of Achiral and Chiral Lanthanide Shift Reagents to Examine Hindered Rotation.

1997 ◽  
Vol 30 (8) ◽  
pp. 1669-1683 ◽  
Author(s):  
Azizeh Elias ◽  
Teresa Gail Roberts ◽  
Kunisi S. Venkatasubban ◽  
R. Rothchild
Keyword(s):  
Nmr Studies ◽  
Hindered Rotation ◽  
Lanthanide Shift Reagents ◽  
Shift Reagents

Observation of buttressing effect and hindered rotation about C(sp2)—C(sp2) single bond in styrenes coordinated to a ruthenium cation, Cp(diphosphine)Ru+

1996 ◽  
Vol 74 (11) ◽  
pp. 1936-1944
Author(s):  
Kenzo Ohkita ◽  
Hideo Asano ◽  
Hideo Kurosawa ◽  
Toshikazu Hirao ◽  
Yohko Miyaji ◽  
...  
Keyword(s):  
Variable Temperature ◽  
Phenyl Group ◽  
Shielding Effect ◽  
Single Bond ◽  
Conformational Isomerism ◽  
Nmr Studies ◽  
Hindered Rotation ◽  
Restricted Rotation ◽  
Conformational Isomers ◽  
Dominant Isomer

Complexes of (η5-cyclopentadienyl)(bis(di-p-tolylphosphino)ethane)ruthenium(II) cation with some styrenes containing meta or para substituants were prepared and their NMR spectra examined in detail. Variable-temperature NMR studies on the unsubstituted and para-substituted styrene analogues demonstrated occurrence of a restricted rotation about the C(sp2)—C(sp2) single bond of the styrenes where one of the ortho hydrogens of the styrene phenyl group receives a very large diamagnetic shielding effect by one of the phosphine tolyl groups. Similar studies on the meta-substituted styrene complexes showed existence of two unequally populated conformational isomers arising from the similar restricted rotation where the meta substituent in the dominant isomer was placed further away from the C=C group. The origin of such conformational isomerism was deduced to be the buttressing effect of the meta substituent transmitted via the ortho-hydrogen atom. Key words: buttressing effect, hindered rotation, Ru–styrene complex.

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