Correlation chart, proton chemical

It is important to learn the ranges of chemical shifts over which the most common types of protons have resonance. Figure 3.20 is a correlation chart that contains the most essential and fre-... 

FIGURE 3.20 A simplified correlation chart for proton chemical shift values. 

Most chemical shifts have 8 values between 0 and 15. A small 8 value represents a small downfield shift, and vice versa. A simplified correlation chart for proton chemical shift values is shown in Table 2 [37]. 

Figure 22 shows a chemical-shift correlation chart for C, illustrating the 5c ranges for functional groups frequently found in polymers [2,16] all shifts are cited relative to the usual reference standard, tetramethylsilane (TMS), at 0 ppm. Aliphatic carbons bonded to silicon (C - Si) also resonate near this point. C-C aliphatic carbons appear at somewhat higher 8c s, between 5 and 50 ppm. As a rule of thumb, 5c increases as the number of protons decreases ... 

Over 100 SbCls affinity values are collected in Table 2.2. The sample of Lewis bases contains mainly oxygen bases and, among these, mainly carbonyl compounds. Only nine nitrogen bases (seven nitriles, one pyridine, one amine) have been studied. The scale lacks second-row bases, carbon bases and halogen bases. We have not reported the values estimated indirectly from correlations between DN and solvent basicity-dependent properties, such as nuclear magnetic resonance chemical shifts of the Na nucleus [27] or of the chloroform proton [28], These values would be valid only if there was no separation into families of bases in the correlation chart, which is rarely found. As shown in this book, family-dependent correlations between basicity-dependent properties are generally the norm. 

---