Taming Ambident Triazole Anions: Regioselective Ion Pairing Catalyzes Direct N-Alkylation with Atypical Regioselectivity
作者:Harvey J. A. Dale、George R. Hodges、Guy C. Lloyd-Jones
DOI:10.1021/jacs.9b02786
日期:2019.5.1
of an organocatalytic methodology for ambident control in the direct N-alkylation of unsubstituted triazole anions. Amidinium and guanidinium receptors are shown to act as strongly coordinating phase-transfer organocatalysts, shuttling triazolate anions into solution. The intimate ion pairs formed in solution retain the reactivity of liberated triazole anions but, by virtue of highly regioselective
Transition-metal(II) thiocyanate coordination compounds containing 4-allyl-1,2,4-triazole. Structure and magnetic properties.
作者:G. Vos、J.G. Haasnoot、G.C. Verschoor、J. Reedijk
DOI:10.1016/s0020-1693(00)86758-4
日期:1985.8
The synthesis and characterisation of a series of dinuclear and polynuclear coordination compounds with 4-allyl-1,2,4-triazole are described. Dinuclearcompounds were obtained for Mn(II) and Fe(II) with composition [M2(Altrz)5(NCS)4], and for Co(II) and Ni(II) with composition [M2(Altrz)4(H2O)(NCS)4](H2O)2. The crystal structure of [Co2(Altrz)4(H2O)(NCS)4](H2O)2 was solved at room temperature. It crystallizes
Iron(III) complexes of N-donor ligands. Part II. The reaction of [Fe(L)2Cl2][FeCl4] with 1,2,4-triazole, 4-Allyl-1,2,4-triazole and 4,4′-bipyridyl; Rearrangement of the chelating ligands
作者:J.G. Vos
DOI:10.1016/s0020-1693(00)86059-4
日期:1985.4
4-triazole (Htrz), 4-allyl-1,2,4,-triazole (Altrz) and 4,4′-bipyridyl (44bpy). The products obtained have been characterised by elemental analyses, infrared spectroscopy and Mossbauer spectroscopy. A rearrangement of the bipyridyl ligands was found and the products obtained are probably mononuclear for Htrz, dimeric for 44bpy and dimeric or polymeric for Altrz.
An investigation into the alkylation of 1,2,4-triazole
作者:Paul G Bulger、Ian F Cottrell、Cameron J Cowden、Antony J Davies、Ulf-H Dolling
DOI:10.1016/s0040-4039(99)02272-8
日期:2000.2
The alkylation of 1,2,4-triazole with 4-nitrobenzyl halides and a variety of bases afforded the 1- and 4-alkylated isomers with a consistent regioselectivity of 90:10. Previously reported regiospecific alkylations of 1,2,4-triazole were re-examined and the quoted isomer ratios were shown to depend on the isolation procedure. The use of DBU as base in the alkylation of 1,2,4-triazole allows for a convenient and high yielding synthesis of 1-substituted-1,2,4-triazoles. (C) 2000 Elsevier Science Ltd. All rights reserved.
Ruthenium(II)bis(2,2-bipyridyl) complexes of some 1,2,4-triazoles