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NMR Spectra of Organogermanium Compounds tuted 1-Trichlorogermylethanes 2-13c NMR spectra of 2-substituted 1-Trichlorogermylethanes

✍ Scribed by Yoshito Takeuchi; Shuji Tomoda; Norihiro Kakimoto

Publisher: John Wiley and Sons
Year: 1985
Tongue: English
Weight: 250 KB
Volume: 23
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260230221

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✦ Synopsis

REFERENCE DATA tene rings of 1-6 therefore invariably induced shielding of the spiro carbons. This cannot be explained entirely on the basis of a changed inductive effect owing to higher homologation, because such an effect will contribute only 1.5 ppm towards shielding.' It is likely that introduction of a methylene group into 1-6 induces an overall change in the geometry of the molecule, which possibly then leads to shielding of the spiro carbons. In such a situation, one would expect C-8 to experience a different shielding effect to that of C-6. The effect of the changed geometry also results in the shielding of C-9 and C-10 in 7-12 (Table 3).

Table 3. Shielding experienced by various carbons in 14-alkoxyand 14-hydroxy-14-azadispiro[5.1.5.2]pentadec-9-ene-7,15-diones and their derivatives

Compound with Cornpound which data

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