EP 1144378 A3 20020911 - PROCESS FOR THE PREPARATION OF 1,2,3,6-TETRAHYDRO-2,2,6,6-TETRAALKYLPYRIDINES
Title (en)
PROCESS FOR THE PREPARATION OF 1,2,3,6-TETRAHYDRO-2,2,6,6-TETRAALKYLPYRIDINES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON 1,2,3,6-TETRAHYDRO-2,2,6,6,-TETRAALKYLPYRIDIN
Title (fr)
PROCEDE DE PREPARATION DE 2,2,6,6-TETRAALKYLPIPERIDINE-1-OXYLE PAR L'INTERMEDIAIRE DE 1,2,3,6-TETRAHYDRO-2,2,6,6-TETRAALKYLPIRIDINE
Publication
Application
Priority
- CH 21999 A 19990205
- CH 48499 A 19990316
- EP 0000733 W 20000131
Abstract (en)
[origin: WO0046202A2] This invention relates to a process for the preparation of a compound of formula (I), wherein R1, R2, R3 and R4 are each independently of one another C1-C4alkyl; R5 is H or CH3; and R6 is H or C1-C18alkyl; from a compound of formula II, which comprises dehydrating the compound of formula (II) either a1) in the form of an aqueous solution or suspension, or a2) in the form of an atomised melt together with water vapour at a temperature of above 150 DEG C on a metal oxide or semimetal oxide catalyst. This invention also relates to a process, in which the compounds of formula I are hydrated and then oxidised to the corresponding N-oxyls.
IPC 1-7
IPC 8 full level
C07D 211/70 (2006.01); C07D 211/94 (2006.01)
CPC (source: EP KR)
C07D 211/46 (2013.01 - KR); C07D 211/70 (2013.01 - EP KR); C07D 211/94 (2013.01 - EP KR)
Citation (search report)
See references of WO 0046202A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0046202 A2 20000810; WO 0046202 A3 20011206; AU 2905900 A 20000825; CA 2352507 A1 20000810; CN 1352633 A 20020605; CZ 20012808 A3 20011114; EP 1144378 A2 20011017; EP 1144378 A3 20020911; JP 2002536363 A 20021029; KR 20010089632 A 20011006; SK 11122001 A3 20011203
DOCDB simple family (application)
EP 0000733 W 20000131; AU 2905900 A 20000131; CA 2352507 A 20000131; CN 00803344 A 20000131; CZ 20012808 A 20000131; EP 00907490 A 20000131; JP 2000597272 A 20000131; KR 20017009833 A 20010803; SK 11122001 A 20000131