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Pyridazine derivatives for electrooptical displays: Pyridazine derivatives for electrooptical displays. Petrzilka, Martin; Trickes, Georg (Hoffmann-La Roche, F., und Co. A.-G., Switz.). Eur. Pat. 93269-64-8 is just another one chemical used in this study. Appl. EP 111695 A2 27 Jun 1984, 65 pp. DESIGNATED STATES: R: CH, DE, GB, LI. (German). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C07D237-08; C09K003-34; C07D237-14; C07D237-12. APPLICATION: EP 83-110788 28 Oct 1983. PRIORITY: CH 82-6748 19 Nov 1982; CH 83-208 14 Jan 1983; CH 83-5132 21 Sep 1983. DOCUMENT TYPE: Patent CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Section cross-reference(s): 28, 75 Pyridazine derivs. (I; R = C1-12 straight chain alkyl; R1 = C1-12 straight chain alkyl or alkoxy; Z = CYC, CH2CH2) are described for use in liq. crystal compns. for electrooptical display devices. These liq. crystal compns. have a dielec. anisotropy of +1 at the most. Thus, 3-[2-(trans-4-pentylcyclohexyl)ethyl]-6-propylpyridazine having a m.p. of 64.2° was prepd. by the hydrogenation of 3-[2-(trans-4-pentylcyclohexyl)ethynyl]-6-propylpyridazine and subsequent recrystn. .

Pyridazines: Pyridazines. Part 30: palladium-catalysed synthesis of 5-substituted 6-phenyl-3(2H)-pyridazinones assisted by a retro-ene transformation. Coelho, Alberto; Ravina, Enrique; Sotelo, Eddy (Laboratorio de Quimica Farmaceutica, Departamento de Quimica Organica, Facultad de Farmacia, Universidad de Santiago de Compostela, Santiago de Compostela 15782, Spain). Synlett, (12), 2062-2064 (English) 2002 Georg Thieme Verlag. CODEN: SYNLES. ISSN: 0936-5214. DOCUMENT TYPE: Journal CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) The efficient one-pot functionalization, through palladium-catalyzed (Pd(PPh3)4 and PdCl2(PPh3)2) Suzuki, Sonogashira and Stille coupling reactions, of position 5 of the 6-phenyl-3(2H)-pyridazinone system I (R = Ph, 4-MeC6H4, 4-ClC6H4, 4-OHCC6H4, CYC-TMS, CYC-CH2OH, CYC-CH(OEt)2, CH=CH2) has been performed using a retro-ene-assisted fragmentation. This route allows access through a short synthetic sequence to several pharmacol. useful 3(2H)-pyridazinones. 13965-03-2 which is the cas registry number is also used here. .