## Abstract Substituent effects on the ^13^C and ^1^H chemical shifts have been studied for derivatives of 3‐benzylidene‐2, 4‐pentanedione. A significant correlation has been found between chemical shifts of the __Z__ carbonyl group (C‐2) and Hammett constants, while no correlation has been found f
Substituent effects on 13C and 1H chemical shifts in 2-isopropyl- and 2,6-diisopropylnaphthalene and their oxidation products
✍ Scribed by Roman Mazurkiewicz; Zbigniew Stec; Jan Zawadiak
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 95 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
13
C and 1 H spectral assignments were made for three 2-substituted-and six 2,6-disubstituted naphthalenes with isopropyl, 2-hydroxy-2-methylethyl and 2-hydroperoxy-2-methylethyl substituents by the use of proton-proton decoupling, 2D H,H-COSY and 2D-C,H-COSY techniques. The downhill simplex method was used for calculations of the best set of 13 C and 1 H incremental shifts. An excellent additivity of substituent effects was found for both, the 13 C and 1 H spectra of 2,6-disubstituted naphthalenes.
📜 SIMILAR VOLUMES
## Abstract Complete ^13^C spectral assignments were made for 1‐ and 2‐R‐naphthalenes (R = Me, Et, __i__‐Pr, __t__‐Bu) in CDCl~3~ solution (5 mol%) by the use of 2D techniques including 2D INADEQUATE. Contradictory assignments from the literature were clarified and incomplete data completed. Substi
## Abstract A principal component analysis is applied to α‐monosubstituted ethyl acetates (YCH~2~CO~2~Et), where the observed chemical shifts for the α‐carbon atom, the carbonyl carbon, and the α‐hydrogen atoms are correlated with theoretically derived molecular properties, i.e. the partial charges
## Carbon -13 chemical shifts of l-phenylsulphonyl-2-phenylaziridine and several of its mand psubstituted derivatives have been determined. The substituent chemical shift (SCS) effects on the benzylic carbon C-2, and on the methylene carbon C-3 have been satisfactorily correlated with Hammett subs
## Abstract Carbon‐13 NMR spectral data for a series of symmetrical 2,6‐disubstituted adamantanes (O, CH~2~, CH~3~, OH, OCOCH~3~) are presented. The substituent effects on ^13^C chemical shifts are additive, except for carbons 2 and 6 in 2,6‐adamantanedione. The non‐additivity of the substituent