75025-18-2Relevant academic research and scientific papers
Preparation of cyclic 6-membered to 8-membered vinylene-1,2-dioxy compounds
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, (2008/06/13)
Cyclic 6-membered to 8-membered 1,2-vinylenedioxy compounds of the general formula I STR1 where A is STR2 R1 to R7 independently of one another are each hydrogen, C1 -C8 -alkyl, C2 -C16 -alkoxyalkyl, C2 -C8 -alkenyl, C2 -C8 -alkynyl, C5 -C8 -cycloalkyl, aryl, C7 -C10 -alkylphenyl, C7 -C10 -phenalkyl, C8 -C10 -phenalkenyl or a heterocyclic structure, or R2 and R3, R2 and R4, R3 and R4, R2 and R6, R3 and R6, R4 and R5 or R6 and R7 together form a cycloaliphatic or heterocyclic ring, and R1 to R7 may furthermore carry substituents which are inert under the reaction conditions, and n is 0 or 1, are prepared by a process in which a cyclic 2-oxymethyl-1,3-dioxa compound or one of its derivatives of the general formula II STR3 where R1 to R7, A and n have the abovementioned meanings, and R8 is hydrogen or C1 -C12 -alkyl, is converted in the presence of an acidic catalyst at from 150° to 450° C. and under from 0.001 to 50 bar, some of the compounds obtained being novel.
