| 摘要 |
1. Process for the preparation of condensation products of pentaerythritol and tetrahydro-DELTA**3 -benzaldehyde compounds of the formulae see diagramm : EP0067353,P3,F3 or see diagramm : EP0067353,P3,F4 in which R its identical or different and represents hydrogen or methyl, in a molar ratio of 1:1 to 1:3, all aldehyde groups being present in an acetalised form, in the presence of catalytic quantities of an acid dehydration catalyst, characterised in that the reaction is carried out in an aqueous medium using excess pressure at a temperature of 80 to 140 degrees C. |
