Abstract
A 1:1 reaction of [HO(CH2)3]3P with 4-hydroxy-3-methoxy-cinnamaldehyde (coniferaldehyde) or 3,5-dimethoxy-4-hydroxycinnamaldehyde (sinapaldehyde) in acetone at room temperature affords phosphonium zwitterions of the type R3P+CH(4-O−-Ar)CH2CHO; other phosphines [R = Et, n-Bu, (CH2)2CN, and p-Tol] do not react under the same conditions. In alcohols R’OH(D) [R’ = CD3, Et, (CD3)2CD, s-Bu, HOCH2CH2], the above phosphines (except the cyano-derivative) and those where R = i-Pr, Cy, Me2Ph, MePh2 do react within an equilibrium established between the reactants and the zwitterion-hemiacetal products R3P+CH(4-O−-Ar)CH2CH(OH)(OR′) that are formed as a mixture of two diastereomers. The nature of the phosphine and the alcohol affects the equilibrium and the diastereomeric ratio.
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Original Russian Text © D.V. Moiseev, B.R. James, A.V. Gushchin, 2012, published in Zhurnal Obshchei Khimii, 2012, Vol. 82, No. 5, pp. 732–740.
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Moiseev, D.V., James, B.R. & Gushchin, A.V. Lignin-type, α,β-unsaturated aldehydes of lignin-type in organic solvents. Russ J Gen Chem 82, 840–847 (2012). https://doi.org/10.1134/S1070363212050064
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DOI: https://doi.org/10.1134/S1070363212050064