Regeneration of α-Haloaldehydes from α-Halodimethylacetals
摘要:
Alpha-Chlorodimethylacetals are hydrolysed in a mixture of acetic acid and aq. HCI (3.5 M) to alpha-chloroaldehydes in excellent yields. On replacing HCI by HBr the same procedure is applied to alpha-bromodimethylacetals.
Trichloroisocyanuric Acid Oxidation of 2-Chloro Aldehyde Acetals to 2-Chloro Acid Esters
作者:Monica Boni、Franco Ghelfi、Ugo Maria Pagnoni、Adriano Pinetti
DOI:10.1246/bcsj.67.156
日期:1994.1
2-Chloro acid methyl esters were prepared in good yields treating 2-chloro aldehyde dimethyl acetals with trichloroisocyanuric acid in DMF. Aldehyde dimethyl acetals with the 2-halogen on a tertiary carbon atom were poorly reactive and could be oxidized effeciently only after their transformation into 1,3-dioxolanes.
Preparation of 2,2-Dihalocarboxylic Acid Methyl Esters by Oxidation–Chlorination of 2-(1-Haloalkyl)-4-methyl-1,3-dioxolanes with Trichloroisocyanuric Acid
作者:Monica Boni、Franco Ghelfi、Ugo Maria Pagnoni、Claudia Zucchi
DOI:10.1246/bcsj.67.1622
日期:1994.6
Methyl 2,2-dichloro or 2-bromo-2-chloro carboxylates were obtained in excellent yields by oxidation–chlorination of 2-(1-haloalkyl)-4-methyl-1,3-dioxolanes with trichloroisocyanuric acid.
Kirrmann,A.; Nouri-Bimorghi,R., Bulletin de la Societe Chimique de France, 1968, p. 3213 - 3220
作者:Kirrmann,A.、Nouri-Bimorghi,R.
DOI:——
日期:——
Acetal chlorination with MnO2-Trimethylchlorosilane
作者:Franco Bellesia、Monica Boni、Franco Ghelfi、Romano Grandi、Ugo M. Pagnoni、Adriano Pinetti
DOI:10.1016/s0040-4020(01)81231-x
日期:1992.1
alpha-Chloroacetals am obtained in almost quantitative yields, by treating acetals with MnO2-trimethylchlorosilane in CH3OH:CH3CN (1:1). The halogenation is explained by a ligand-transfer process on an enolether intermediate, mediated by a Mn(IV)-chloride species.
Epoxyethers. VII. Reaction of α-Haloaldehydes with Base