NMR spectroscopy table

Nuclear Magnetic Resonance. AH three hydrogen isotopes have nuclear spins, I 7 0, and consequently can all be used in nmr spectroscopy (Table 4) (see Magnetic spin resonance). Tritium is an even more favorable nucleus for nmr than is H, which is by far the most widely used nucleus in nmr spectroscopy. The radioactivity of T and the ensuing handling problems are a deterrent to widespread use for nmr. Considerable progress has been made in the appHcations of tritium nmr (23,24). 

The products of reactions 4-9 have been characterized in SO2CIF solution by l3C and 19F NMR spectroscopy (Table 2). All solid products and their SO2CIF solutions were stable indefinitely at temperatures approaching-20 °C. 

Thus, the latter approach was clearly preferable and several NPG donors were coupled to 41 under these conditions in order to investigate trends in anomeric selectivity, as monitored by gel-phase 13C NMR spectroscopy (Table 5.1).66 As expected, neighboring-group active donors 44 and 45 produced solely the... 

The few examples presented below in this section and the rest of the chapter point to various properties that can be investigated by NMR spectroscopy. Table 5 presents data on the atomic mass and nuclear spin of elements that are relevant to the MS and NMR spectroscopic techniques applied to organic and some organometalhc compounds. 

The erythrolthreo-KoracK of three 4,5-disubstituted-l,3-dioxanes 73 (cf. Table 5), synthesized as chiral building blocks based on the 1,3-dioxane core, were assigned by H NMR spectroscopy (Table 5) <1999TA139> additionally, they are enantiomerically pure. 

Figure 12 The solution structure of [(/, S)-BINAPHOS]Rh(H)(CO)2 confirmed by NMR spectroscopies. Table 6 Hydroformylation of styrene using 32 and 33 as ligands...

In 1969 Giam and Stout reported the first isolation of solid organolithium adducts of pyridine.134 In a typical experiment pyridine was added to a cold LiBr-free ether solution of phenyllithium. The resulting yellow solid was collected and investigated by 100 Hz H-NMR spectroscopy (Table XIV) in N,N,N. /V -tetramethyI-l,2-diaminoethane (TMEDA) solution. It was assigned structure 86. The solid was sensitive to moisture, oxygen, and heat, and when dissolved in diethyl ether it was oxidized by oxygen to afford... 

The structure of hydrol lignin has been examined by NMR spectroscopy. Tables of 8 values for types of protons found in hydrol lignin have been established, and 8 values for various types of aromatic ring substitution patterns have been clarified. 

Using the same reactor, a premixed solution of aldehyde or ketone and dithiol (1.0 M, 1 1) in anhydrous MeCN was passed through the Amberlyst-15 126 containing packed bed. The reaction products were again collected in MeCN and analyzed every 10 min by GC-MS. Once optimized, the reactions were conducted for 1 h, to produce the required quantity of each 1,3-dithiane or 1,3-dithiolane, the reaction products were then concentrated in vacuo and analyzed by 1H NMR spectroscopy (Tables 16 and 17) (Wiles et al., 2007b). 

The structure of anew alkylating agent, 2-(l-methyl-l-nitroethyl)-5-nitrothiazole and its C-alkylation product of the reaction with 2-nitropropane anion by SRN1 mechanism has been assigned by proton and carbon NMR spectroscopy (Table 3.20) [541, 542],... 

Nitro derivatives of 2,1,3-benzoxadiazole (benzofurazan) and 2,1,3-benzoxadi-azole-1-oxide (benzofuroxan) were studied by H, 13C, and 15N NMR spectroscopy (Table 3.29) [746-759],... 

The electronic structure of tautomeric nitrobenzotriazoles and their 1-methyl- and 2-methylbenzotriazoles (Scheme 3.15) have been studied by means of multinuclear one- and two-dimensional II, 13C and15N NMR spectroscopy (Tables 3.31-3.33) and quantum chemistry (Table 3.34) [826] ... 

This conclusion was also confirmed by multinuclear (13C, 15N, 29Si) NMR spectroscopy (Table VI). The 29Si resonances of complexes 11, except that for iig, shifted to lower field upon cooling. This has been rationalized by the ionization reaction A E (Scheme 1), which converts the pentacoordinate silicon to tetracoordinate, resulting in the shift of... 

Molecular weight of poly(vinylmethyl-c<9-dimethyl)siloxane arms was determined by SEC and H NMR spectroscopy (Table 1). The SEC values obtained in... 

The bis(pyrrolidinyl)silanes, IVa-IVh, which are colorless liquids and highly moisture sensitive, were purified by vacuum distillation. Compounds IVa-IVh were characterized by elemental analysis (Table I) and and NMR spectroscopy (Table IV). The NMR spectra confirmed the structure shown in the equation. Table IV lists the chemical shifts for the R and R groups in these compounds. The pyrrolidinyl group showed two resonances at about 1.7 and 2.9 ppm in the NMR spectra and at about 26 and 46 ppm in the NMR spectra for the two methylene groups, which, for simplicity, are not shown in Table IV. 

Both anions could be characterized by multinuclear NMR spectroscopy and single-crystal X-ray diffraction analysis [9]. Si NMR spectroscopy (Table 1) reveals the silylenoid character of the first reaction product (2) by a rather large downfield shift of the resonance of the anionic silicon at n of some 30 ppm compared to the shift of methoxytris(trimethylsilyl)silane. This behavior is in fiill... 

Schuster89 has studied the Substituent-Induced Chemical Shifts (SCS) in 1-aminonaph-thalene and 9-aminoanthracenes by 13C NMR spectroscopy. Table 10 presents the 13C SCSs for 1-aminonaphthalene 32, 9-aminoanthracene 33 and 9-amino-4,5-dichloroanthra-cene 34 (Figure 11). 

The azo dyes used in this study were l-phenylazo-2-naphthol-6-sulfonate (2) and seven derivatives with substituents in the meta or para positions of the phenyl ring (3-9). These were selected as representative l-azo-2-naphthol sulfonate dyes and because the substituents on phenyl ring would allow a systematic study of the mechanism of their oxidation by metalloporphyrin-catalysed systems in aqueous solution. Dye 2 is commercially available (as Acid Orange 12) and was purified by reciystallisation whilst the others (3-9) were prepared by standard diazonium ion/2-naphthol coupling reactions. The purities of all the dyes were checked by TLC, MS and H NMR spectroscopy. Table 1 reports the measured pl values of all the azo dyes used in this study. 

The deuterium-labelled initiator method was also applied to the polymerization of macromonomer to determine the number of initiator fragments in a polymacromonomer chain (N) and initiator efficiency (/)-77 Isotactic and syndiotactic PMMA macromonomers having a styrene group as polymerizable function were polymerized with AIBN-<7 2 in toluene at 60°C and the resultant polymacromonomers were analysed by 2H NMR spectroscopy (Table 8). The N values were less than unity (0.50 0.72), indicating some kind of chain transfer reaction in the radical polymerization of macromonomer. The / values were 0.18 0.28 and much smaller than those for styrene polymerization (0.5 0.7). The isotactic macromonomer gave larger N and / values than the syndiotactic... 

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