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Two-bond geminal coupling

Spm-spm splitting of NMR signals results from coupling of the nuclear spins that are separated by two bonds (geminal coupling) or three bonds vicinal coupling)... [Pg.576]

Figure 3.41. Residual protonated resonances of deuterated solvents (a) CHCI3 in CDCI3, (b) CHDCI2 in CD2CI2 and (c) CHD2COCD3 in (CD3)2C0. The multiplicity seen in (b) and (c) arises from two-bond (geminal) couplings to spin— 1 deuterium producing a 1 1 1 triplet and a 1 2 3 2 1 quintet respectively. The left-hand singlet in (b) is residual CH2CI2 in the solvent, the shift difference arises from the H-D isotope shift of 6 Hz. Figure 3.41. Residual protonated resonances of deuterated solvents (a) CHCI3 in CDCI3, (b) CHDCI2 in CD2CI2 and (c) CHD2COCD3 in (CD3)2C0. The multiplicity seen in (b) and (c) arises from two-bond (geminal) couplings to spin— 1 deuterium producing a 1 1 1 triplet and a 1 2 3 2 1 quintet respectively. The left-hand singlet in (b) is residual CH2CI2 in the solvent, the shift difference arises from the H-D isotope shift of 6 Hz.
The mechanism of cis and trans couphng in alkenes is no different from that of any other three-bond vicinal coupling, and that of the terminal methylene protons is just a case of two-bond geminal coupling. All three types have been discussed already and are illustrated in Figure 5.19. [Pg.238]

See other pages where Two-bond geminal coupling is mentioned: [Pg.2]    [Pg.308]    [Pg.141]    [Pg.138]    [Pg.138]    [Pg.138]    [Pg.138]    [Pg.105]    [Pg.43]    [Pg.30]    [Pg.197]    [Pg.138]    [Pg.138]    [Pg.60]    [Pg.355]    [Pg.3306]    [Pg.30]    [Pg.400]    [Pg.280]   


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