Showing papers by "Raimondo Maggi published in 1994"
TL;DR: The reaction of formaldehyde with 2,2′-dihydroxytriphenylmethanes 3 in acidic media gives calix[4]arenes 4 bearing two aryl groups on the diametrical methylene bridges as mentioned in this paper.
Abstract: Reaction of formaldehyde with 2,2′-dihydroxytriphenylmethanes 3 in acidic media gives calix[4]arenes 4 bearing two aryl groups on the diametrical methylene bridges.
29 citations
TL;DR: In this paper, metal-template ortho-regioselective alkylation of phenols with 2-, 3- and 4-pyridinealdehydes was used to synthesize 2.2′-hydroxyphenylpyridinemethanols.
16 citations
TL;DR: A metal-template ortho-regioselective mono-and bis-de- tert -butylation of poly- tert-butylated phenol-formaldehyde oligomers is reported in this paper.
13 citations
TL;DR: A mild synthesis of phenolic oximes has been performed by heating AlCl3 in nitromethane with suitable phenols (molar ratio 2 : 1) as discussed by the authors.
10 citations
9 citations
TL;DR: In this paper, 1,4-Anthraquinones 17 were synthesized by allowing 1, 4-hydroquinones to react with phthalaldehyde (OPA) and they were shown to be di- or tetra-attackable.
Abstract: Oxophilic metal phenolates undergo highly selective condensations with aromatic dialdehydes to produce compounds 6, 7, 11 and 12 resulting from di- or tetra-attack, depending upon the phenolaldehyde molar ratio. 1,4-Anthraquinones 17 were synthesized by allowing 1,4-hydroquinones to react with phthalaldehyde (OPA).
7 citations
4 citations
TL;DR: In this paper, simple preparation of ethyl 3-hydroxy-1,4-naphthoquinone-2-carboxylates including heterocyclic analogs is accomplished by C-regioselective bis-acylation of aromatic and heteroaromatic β-keto esters.
Abstract: Simple preparation of ethyl 3-hydroxy-1,4-naphthoquinone-2-carboxylates 2 including heterocyclic analogs is accomplished by C-regioselective bis-acylation of aromatic and heteroaromatic β-keto esters 1. Compounds 2 are readily hydrolyzed and decarboxylated to the corresponding 2-hydroxy-1,4-naphthoquinone derivatives 3
1 citations
TL;DR: In this article, 1,4-Anthraquinones 17 were synthesized by allowing 1, 4-hydroquinones to react with phthalaldehyde (OPA) and they were shown to be di- or tetra-attackable.
Abstract: Oxophilic metal phenolates undergo highly selective condensations with aromatic dialdehydes to produce compounds 6, 7, 11 and 12 resulting from di- or tetra-attack, depending upon the phenolaldehyde molar ratio. 1,4-Anthraquinones 17 were synthesized by allowing 1,4-hydroquinones to react with phthalaldehyde (OPA).
TL;DR: Optically active 4-hydroxymandelic esters were prepared in good yields and very high diastereoselectivity (up to 96% d) via para-hydroxyalkylation of phenolic ethers as mentioned in this paper.
Abstract: Optically active 4-hydroxymandelic esters were prepared in good yields and very high diastereoselectivity (up to 96% d.e.) via para-hydroxyalkylation of phenolic ethers. Enantiomeric pure 4-hydroxymandelic acid is available by hydrolysis.
TL;DR: In this paper, the synthesis of a series of persubstituted 4-hydroxy-2-pyrones by regioselective cyclotrimerization of aliphatic acyl chlorides promoted by aluminum chloride is reported.
Abstract: The synthesis of a series of persubstituted 4-hydroxy-2-pyrones 6 by regioselective «one-pot» cyclotrimerization of aliphatic acyl chlorides promoted by aluminum chloride is reported