Tables of Coupling Constants

Spectrum of the alkenic protons of cyclopropene. The satellite is a doublet of triplets, since the alkenic proton on is coupled to the other alkenic proton and to the two methylene protons. Other dilute spins produce satellite spectra that are commonly observed in proton spectra, including Si, Se, Cd, Cd, Sn, Sn, Pt, and Hg. 

The most general and effective method for analyzing complex proton spectra involves the use of two dimensions, as is described in Chapter 6. Even this method, however, has limitations imposed on it by the presence of second-order relationships. 

1 Characterize the indicated protons as (1) homotopic, enantiotopic, or diastereotopic and (2) magnetically equivalent or nonequiva lent (by the coupling-constant criterion). In parts (h) and (i), the Cr(CO)3 ligand remains on one side of the benzene ring. 

3 Write out the rotamers of 2-chloroethanol (CICH2CH2OH). What is the spin notation at slow rotation for each rotamer and at fast rotation for the average  

4 Consider the following H-decoupled P spectrum of the platinum complex with the structure illustrated (the resonances of the anion are omitted)  

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Tables of coupling constants involving F have been compiled, including literature values over the same period as the chemical shifts. " The one-bond...

Chapter XI is devoted to Qualitative Organic Analysis. The subject b discussed in moderate detail and this, coupled with the various Sections and Tables of Physical Constants of Organic Compounds and their Derivatives in Chapters III and IV, will provide a satisfactory course of study in this important branch of chemistry. No attempt has been made to deal with Quantitative Organic Analysb in this volume. 

Exocyclic conjugation causes a small upheld shift of the ring hydrogen resonances, as can be seen in Table 6. The increase in tr-bond hxation also results in an increase in the 4,5 coupling constant to about 6.0 Hz. The use of coupling constants for the investigation of tautomerism is discussed in Section 4.17.5. 

MHz, solvent CDC13 and homodecoupling spectra processing with sine bell function (sb = 1) tables with chemical shift in ppm and Hz for the determination of coupling constants... 

Table 5. Solvent dependence of coupling constants in difluoro- and trifluorome thane...

Table 34. Summary of solvent induced changes of coupling constants in three-membered rings = jC6h12 jdmso...

Table 35 Solvent dependence of coupling constants for ethylene-3,1,2-thiadioxalone-2 in various solvents...

Yoshito Takeuchi and Toshio Takayama TABLE 45. Coupling constants and isotope shifts of stannylallenes in CgD6... 

Table 7. coupling constants of some X -phosphotin radical cations and anions... 

Table 32. Coupling constants, total expansion and g values of l.l-hetero-2.4.6-triphenyl-X -phosphorin radical cations...

The normal pattern of coupling constants for aromatic six-membered rings is found in the heterocyclic aza systems, except that the ortho coupling to a proton a to a heterocyclic nitrogen is reduced from 7-8 Hz to 4.5-6 Hz. The J23 of pyrylium salts is still lower (ca. 3.5 Hz), but in pyridinium salts and pyridine iV-oxide it is of intermediate value (ca. 6.5 Hz) (see Table 7). 

TABLE 6.65 Spin-Spin Coupling (Hyperfine Splitting Constants) Values of coupling constant at given in gauss Involves protons unless otherwise indicated. 

In the DMSO-dg solution only one CH,-signal was found in the spectrum of atenolol, ana the solvent caused a slight downfield effect upon.the chemical shift. On the other hand, all other C chemical shifts were moved substantially upfield, the changes ranging from o.6o for C-4 to 4.27 ppm for the C=0 group (Table 4.). The NOE spectrum shows rather smeared multiplets which were not suitable for precise determination of coupling constants, except in very few cases. 

TABLE 2. Coupling constants of radical ions of tetrasilabicyclo[3.3.0]octane derivatives... 

TABLE 3. Coupling constants /(29Si—29Si) in compounds of the type (R3SiA)3SiBXa26°... 

Table 5 Coupling constants (7(C,H), Hz) of some parent A,B-diheteropentalenes. ...

Table V. Coupling Constants for HO-Adduct Radicals of Butadiene, Vinyl Fluoride, and Vinyl Chloride...

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