Halogen exchange in reactions of boron halides with o-(trifluoromethyl)-phenyltrimethyl derivatives of silicon and tin

1970 ◽  
Vol 48 (24) ◽  
pp. 3856-3859 ◽  
Author(s):  
T. Chivers
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Carbon Tetrachloride ◽  
Magnetic Resonance ◽  
Boron Trifluoride ◽  
Potassium Fluoride ◽  
Coupling Constants ◽  
Boron Trichloride ◽  
Halogen Exchange ◽  
Boron Halides ◽  
Derivatives Of

The reaction of boron trifluoride with o-CF3C6H4SnMe3 in carbon tetrachloride gives o-CF3C6H4BF2, which with aqueous potassium fluoride is converted to K[o-CF3C6,H4BF3]. Boron trichloride and o-CF3C6H4SnMe3 undergo halogen exchange to give, after hydrolysis, o-CCl3C6H4B(OH)2. Halogen exchange also occurs between boron trichloride and o-CF3C6H4Y (Y = H, SiMe3) to give boron trifluoride and o-CCl3C6H4Y. The long range HF and FF nuclear magnetic resonance (n.m.r.) coupling constants observed for o-CF3C6H4-derivatives are briefly discussed.

Methyltin trinitrate and a comparison of its properties with other methyltin nitrates

1970 ◽  
Vol 48 (5) ◽  
pp. 711-716 ◽  
Author(s):  
J. R. Ferraro ◽  
D. Potts ◽  
A. Walker
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Carbon Tetrachloride ◽  
Magnetic Resonance ◽  
Infrared Spectrum ◽  
Vibrational Spectrum ◽  
Vibrational Spectra ◽  
Coupling Constants ◽  
Dinitrogen Pentoxide ◽  
Proton Coupling ◽  
Nuclear Magnetic Resonance Spectra

Methyltin trinitrate has been prepared by the reaction of dinitrogen pentoxide on methyltin trichloride in carbon tetrachloride, followed by sublimation in vacuo at 60 °C. Conductivities and ultraviolet spectra of methyltin trinitrate in several solvents are reported. Vibrational spectra indicate that the three nitrato groups are all bonded in the same bidentate manner and the reactivity of the compound towards aliphatic hydrocarbons and diethyl ether shows that the compound is chemically similar to tin(IV) nitrate. The vibrational spectrum of methyltin trinitrate is compared with those for trimethyltin nitrate, dimethyltin dinitrate, and tin(IV) nitrate. Nuclear magnetic resonance spectra have been determined for the series MenSn(NO3)4−n (n = 1,…, 4), and a comparison of the 117Sn– and 119Sn–proton coupling constants for the series has been made showing that the tin atom becomes more electron deficient and has more s character in its bonding orbital to carbon as n decreases. The pyridine adduct MeSn(NO3)3•2py has been prepared and the infrared spectrum of this compound indicates that the nitrate groups are unidentate.

Discussion on 13C nuclear magnetic resonance spectra of structurally rigid cyclonucleosides. Violation of Karplus relationship between 3JC,H and dihedral angles

1984 ◽  
Vol 62 (8) ◽  
pp. 1555-1557 ◽  
Author(s):  
Jun Uzawa ◽  
Kentaro Anzai
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Coupling Constants ◽  
Dihedral Angles ◽  
Vicinal Coupling Constants ◽  
Nuclear Magnetic Resonance Spectra ◽  
13C Nuclear Magnetic Resonance ◽  
Karplus Relationship ◽  
Derivatives Of ◽  
C Nmr

Using structurally rigid cyclonucleoside derivatives of adenosine, the effect of the oxygen functional groups on the vicinal coupling constants between carbon and hydrogen in, 13C nmr was investigated.

Kernresonanzspektroskopische Untersuchungen (1H-, 13C-, 31P-, 195Pt-NMR) an Alkinyl-Komplexen von PtII, PdII und NiII / Nuclear Magnetic Resonance (1H-, 13C-, 31P-, 195Pt-NMR)-Studies of Alkynyl Derivatives of PtII, PdII and NiII

1983 ◽  
Vol 38 (1) ◽  
pp. 45-56 ◽  
Author(s):  
Angelika Sebald ◽  
Bernd Wrackmeyer ◽  
Wolfgang Beck
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Nmr Studies ◽  
Nmr Parameters ◽  
Cis And Trans ◽  
Derivatives Of ◽  
Nuclear Magnetic

The NMR parameters (1H, 13C, 31P, 195Pt) of compounds of the type cis- and trans- [M(C≡C-R)2(PR′3)2] (M = Ni, Pd, Pt) are reported. The chemical shifts δ13C (M-C≡C; R) and δ195Pt (together with UV data) indicate the presence of π-backbonding from the metal into π*C≡C the orbitals. This also explains some unusual features of the coupling constants J(≡13C1H), J(13C≡13C) and J(195Pt13C≡). The NMR parameters reflect an increase in the amount of π-backbonding for Pt < Pd < Ni.

Conformational dynamics detected by nuclear magnetic resonance NOE values and J coupling constants

1988 ◽  
Vol 110 (11) ◽  
pp. 3393-3396 ◽  
Author(s):  
Horst. Kessler ◽  
Christian. Griesinger ◽  
Joerg. Lautz ◽  
Arndt. Mueller ◽  
Wilfred F. Van Gunsteren ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Conformational Dynamics ◽  
Coupling Constants ◽  
J Coupling ◽  
J Coupling Constants ◽  
Nuclear Magnetic
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