Global Patent Index - EP 1144378 A3

EP 1144378 A3 2002-09-11 - 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

EP 1144378 A3 (EN)

Application

EP 00907490 A

Priority

  • CH 21999 A
  • CH 48499 A
  • EP 0000733 W

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 (main, further and additional classification)

C07D 211/70; C07D 211/94

IPC 8 full level (invention and additional information)

C07D 211/70 (2006.01); C07D 211/94 (2006.01)

CPC (invention and additional information)

C07D 211/70 (2013.01); C07D 211/94 (2013.01)

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

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