C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/359, 260/280
C07D 309/06 (2006.01) C07D 405/04 (2006.01) C07D 407/04 (2006.01)
Patent
CA 1319150
- 25 - O.Z. 0050/38673 Abstract of the Disclosure: 4-Formyltetrahydropyrans of the general formula I Image (I) where R1 is hydrogen, C1-C12-alkyl, C2-C12-alkenyl, C1-C6- alkoxy-substituted C1-C12-alkyl, C4-C12-cycloalkyl, unsub- stituted or substituted aryl, hetaryl or aralkyl, or an unsubsituted or substituted, saturated or unsaturated 5- membered or 6-membered ring which may be interrupted by N, O or S, are prepared by a process in which a pyran derivative of the general formula II Image (II) where R1 is as defined above, R2 and R3 are each OH or together are an oxygen atom and thus form an oxirane ring, and R4 is hydrogen where R2 and R3 are each OH, and is hydrogen or tert-butoxycarbonyl where R2 and R3 together are an oxygen atom, is treated at elevated temperatures with a catalyst selected from the group consisting of zeo- lites, phosphates, boric acid on a carrier and silica or mixtures of these. Novel 4-formyltetrahydropyrans are also proposed.
545305
Goetz Norbert
Hoelderich Wolfgang
Hupfer Leopold
Spiegler Wolfgang
Wild Jochen
Basf Aktiengesellschaft
Robic
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