A Facile, Selective Preparation of Monoketals from Pentaerythritol and Ketones
作者:Ricardo Grau、Marcelo Murguía、Santiago Vaillard
DOI:10.1055/s-2001-14569
日期:——
The selective preparation of monoketals 3a-f from pentaerythritol 1 and cyclic, acyclic, aromatic, and aliphatic ketones 2a-f was achieved by a facile method. The extreme polarity and low solubility of pentaerythritol in almost all organic solvents were the main difficulties to be overcome for the preparation of monoketals in good yields and high selectivity. A benzene-dimethylformamide (40:60) mixture proved to be excellent for the ketalization. The one-step procedure developed allowed the preparation of monoketals in good yields and good to excellent selectivity (higher than 90%).
Spirocyclic acetal compound and method of producing the same, and polymer having spirocyclic acetal structure
申请人:Ito Takayuki
公开号:US20070191584A1
公开(公告)日:2007-08-16
A method of producing a spirocyclic acetal compound of formula (II), having subjecting a compound of formula (I) and pentaerythritol to dehydration condensation, in the presence of a solid acid catalyst; and the polymer having a repeating unit represented by formula (III), which is produced using the spirocyclic acetal compound of formula (II):
wherein R
1
represents an alkyl, cycloalkyl or aryl group, Q represents a hydrogen atom or an acyl group, L represents a divalent linking group having at least one carbon atom, and n is 0 or 1