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Abstract:

The reaction of phenyllithium (PhLi) with E-cinnamaldehyde (1) has been fully examined. Besides the main product E-1,3-diphenyl-2-propen-1-ol (2), three other by-products were detected: E-cinnamyl alcohol (3), E-chalcone (4) and E-1,3-diphenylpropanone (5). The effect of several variables on the nature and relative yields of products was examined. In all the solvents studied, the selectivity of the reaction was higher at higher temperatures, probably owing to aggregation effects; at lower temperatures the reaction is slower and the amount of by-products increases. The addition is complete in 1 h at 0°C in THF for a [PhLi]:[1] ratio of 1:1, and longer reaction times have almost no effect, while for the reaction in toluene the amount of by-products increases when the reaction mixture is allowed to stand. The concentration of the reagents has no important effect on the reaction as long as the ratio is kept equal to 1:1. The influence of light was examined and a marked decrease in the selectivity of the reaction was observed. When the reaction was carried out in the presence of radical traps, no by-products were detected. Finally, for a [PhLi]:[1] ratio of 3:1 the main product is the dihydrochalcone 5, especially for long reaction times. All the above results could be interpreted in a reaction scheme involving electron transfer from PhLi to 1, and further reaction of the radical ions formed as well as reaction of dimeric PhLi without previous deaggregation when the ratio is 3:1. © 1998 John Wiley & Sons, Ltd.

Registro:

Documento: Artículo
Título:Reaction of phenyllithium with E-cinnamaldehyde: Survey of several variables and their influence on the mechanism of reaction and in organic synthesis
Autor:Nudelman, N.S.; Schulz, H.G.; García, G.V.
Filiación:Depto. de Quim. Orgánica, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Palabras clave:Addition; E-cinnamaldehyde; Mechanism; Organolithium; Phenyllithium
Año:1998
Volumen:11
Número:10
Página de inicio:722
Página de fin:730
Título revista:Journal of Physical Organic Chemistry
Título revista abreviado:J Phys Org Chem
ISSN:08943230
CODEN:JPOCE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08943230_v11_n10_p722_Nudelman

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Citas:

---------- APA ----------
Nudelman, N.S., Schulz, H.G. & García, G.V. (1998) . Reaction of phenyllithium with E-cinnamaldehyde: Survey of several variables and their influence on the mechanism of reaction and in organic synthesis. Journal of Physical Organic Chemistry, 11(10), 722-730.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08943230_v11_n10_p722_Nudelman [ ]
---------- CHICAGO ----------
Nudelman, N.S., Schulz, H.G., García, G.V. "Reaction of phenyllithium with E-cinnamaldehyde: Survey of several variables and their influence on the mechanism of reaction and in organic synthesis" . Journal of Physical Organic Chemistry 11, no. 10 (1998) : 722-730.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08943230_v11_n10_p722_Nudelman [ ]
---------- MLA ----------
Nudelman, N.S., Schulz, H.G., García, G.V. "Reaction of phenyllithium with E-cinnamaldehyde: Survey of several variables and their influence on the mechanism of reaction and in organic synthesis" . Journal of Physical Organic Chemistry, vol. 11, no. 10, 1998, pp. 722-730.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08943230_v11_n10_p722_Nudelman [ ]
---------- VANCOUVER ----------
Nudelman, N.S., Schulz, H.G., García, G.V. Reaction of phenyllithium with E-cinnamaldehyde: Survey of several variables and their influence on the mechanism of reaction and in organic synthesis. J Phys Org Chem. 1998;11(10):722-730.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08943230_v11_n10_p722_Nudelman [ ]