Synthesis and Conformational Analysis of α,β‐Dichlorocarbonyl Compounds.

Autor:	Kobayashi, Shunta, Prakoso, Nurcahyo Iman, Zheng, Xin, Noro, Shin‐ichiro, Hashimoto, Masaru, Morozumi, Tatsuya, Umezawa, Taiki
Předmět:	CONFORMATIONAL analysis COUPLING constants CARBONYL compounds NUCLEAR magnetic resonance spectroscopy CHLORINE compounds
Zdroj:	European Journal of Organic Chemistry; 9/2/2024, Vol. 27 Issue 33, p1-7, 7p
Abstrakt:	α,β‐Dichlorocarbonyl compounds were synthesized by facile dichlorination of α,β‐unsaturated amides with TCIA‐PPh3 and the resultant amides were converted to ketones. Conformational analyses of the products were performed to confirm our previous hypothesis regarding vicinal dichlorinated carbonyl compounds. The compounds exhibited 1H NMR signals with large coupling constants (7–11 Hz) for the 1,2‐anti‐configuration and small coupling constants (3–4 Hz) for the 1,2‐syn‐configuration. The syn‐pentane interaction enabled rational conformational analysis of the α,β‐dichlorinated carbonyl compounds, although some interesting exceptions were observed. Consideration of these conformations is helpful in assigning relative configurations of α,β‐dihalogenated carbonyl compounds in general. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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