PROCESS FOR PRODUCTION OF 2-/3-BROME-PROPHIL/-5,5-DIMETHIL-1,3-DIOXAN AND 2-/4-BROME-BUTHIL/-5,5-DIMETHIL-1,3-DIOXAN

摘要

The invention relates to a process for preparing the ketals of 4-bromobutanal and of 5-bromopentanal of the formula IMAGE which comprises reacting 2,3-dihydroguran and 3,4-dihydro-2H-pyran respectively in a solvent in the presence of a catalyst with neopentylglycol and then brominating the resulting product. The invention also relates to the said ketal of 5-bromobutanal as such.