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Primary Studies on Variation in Position of Trifluoromethyl Groups in Several Aromatic Group‐14 Derivatives by 19 F‐NMR Spectroscopy
Variation in the position of CF 3 groups in several aromatic Group‐14 compounds was studied by 19 F‐NMR spectroscopy. In these compounds R n ECl 4− n ( n =1 or 2; E=Si, Ge, or Sn; R=2,4,6‐(CF 3 ) 3 C 6 H 2 (=Ar), 2,6‐(CF 3 ) 2 C 6 H 3 (=Ar′), or 2,4‐(CF 3 ) 2 C 6 H 3 (=Ar″)), Ar, Ar′, and Ar″ are al...
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| Published in: | Helvetica chimica acta 2013-06, Vol.96 (6), p.1078-1084 |
|---|---|
| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Variation in the position of CF
3
groups in several aromatic Group‐14 compounds was studied by
19
F‐NMR spectroscopy. In these compounds R
n
ECl
4−
n
(
n
=1 or 2; E=Si, Ge, or Sn; R=2,4,6‐(CF
3
)
3
C
6
H
2
(=Ar), 2,6‐(CF
3
)
2
C
6
H
3
(=Ar′), or 2,4‐(CF
3
)
2
C
6
H
3
(=Ar″)), Ar, Ar′, and Ar″ are all bulky, strongly electron‐withdrawing ligands. The
19
F‐NMR studies of the variation in position of the CF
3
substituents in these compounds as revealed by chemical shifts could be correlated with the electronegativities of the central elements E, and with intramolecular E–F interactions derived from single‐crystal X‐ray diffraction data. These interactions are considered to play an important role in the stabilization of these compounds. |
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| ISSN: | 0018-019X 1522-2675 |
| DOI: | 10.1002/hlca.201200389 |