Stereochemical aspects of proton chemical shifts. VII. The γ effects of hydroxyl, methoxyl and methyl substituents

Stereochemical aspects of proton chemical shifts. VII. The γ effects of hydroxyl, methoxyl and methyl substituents

The 1H NMR chemical shifts of some hydroxy, methoxy or methyl substituted trans‐decalins, trans‐1, 3‐dioxadecalins and cyclohexanes are reported. It is concluded that the replacement in a g+g+ HCCCH fragment of one hydrogen by hydroxy, methoxy or methyl results in a modest (0.1 ppm) upfield shif...

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Veröffentlicht in:Organic Magnetic Resonance 1978-12, Vol.11 (12), p.628-631
Hauptverfasser: Tavernier, Dirk, Anteunis, Marc J. O.
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creator Tavernier, Dirk
Anteunis, Marc J. O.
description The 1H NMR chemical shifts of some hydroxy, methoxy or methyl substituted trans‐decalins, trans‐1, 3‐dioxadecalins and cyclohexanes are reported. It is concluded that the replacement in a g+g+ HCCCH fragment of one hydrogen by hydroxy, methoxy or methyl results in a modest (0.1 ppm) upfield shift of the other hydrogen atom. Experimental limitations to the transferability of shift increments from one molecular environment to another are demonstrated. The syntheses of 1α,5β‐dimethoxy‐ and 1β,5α‐dimethoxy‐trans‐decalin are given.
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title Stereochemical aspects of proton chemical shifts. VII. The γ effects of hydroxyl, methoxyl and methyl substituents
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