- Azacyclo-dicarbene subunit borane ionic liquid and preparation method thereof
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The invention relates to an azacyclo-dicarbene subunit borane ionic liquid and a preparation method thereof. The azacyclo-dicarbene subunit borane ionic liquid has a structural formula I as shown in the specification. A method for preparing the compound of formula I comprises the following main steps: performing an alkylation reaction on 1,2,4-triazole and a carbonic ester compound, further performing a quaternary amination reaction with halogenated hydrocarbon, and finally performing a reaction with sodium borohydride, thereby obtaining a target product. The ionic liquid provided by the invention can be used as a self-combustion type green rocket propellant, and has the advantages of being short in ignition delay time, good in water stability, large in density ratio impact value, and thelike. In the formula I, R1 is selected from any one of alkyl, and R2 is selected from any one of hydrocarbyl substituent groups.
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Paragraph 0055; 0058
(2018/07/30)
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- Pyrazolyl benzyl ether derivatives containing a fluoromethoxyimino group and use thereof as pesticides
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The invention relates to novel pyrazolyl benzyl ethers, to a plurality of processes for their preparation and to their use for controlling harmful organisms.
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- Spin-transition behaviour in chains of FeII bridged by 4-substituted 1,2,4-triazoles carrying alkyl tails
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A family of polymeric 1-dimensional chains of iron(II) species showing the spin-crossover phenomenon has been synthesized using 4-n-alkyl-1,2,4-triazoles as bridging ligands. The influence of the length of the alkyl tails on the triazole ligands on characteristic features of the spin transition was studied, showing degrading of steepness with increasing length. A set of four counter ions has been used to access a wider range of transition temperatures. Large hysteresis loops are detected with small tails, mainly for the methyl and ethyl substituted products. In most cases longer tails weaken co-operativity and hysteresis gradually decreases to zero. However it is shown that with certain anions hysteresis remains, even with very long tails on the triazoles. Weakening of the co-operativity mainly arises from a diminution of the length of the polymeric chains with increasing alkyl tails on the triazole. This effect is anion dependent. A strong interaction along the polymeric chains is confirmed.
- Roubeau,Alcazar Gomez,Balskus,Kolnaar,Haasnoot,Reedijk
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p. 144 - 150
(2007/10/03)
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- An investigation into the alkylation of 1,2,4-triazole
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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.
- Bulger, Paul G.,Cottrell, Ian F.,Cowden, Cameron J.,Davies, Antony J.,Dolling, Ulf-H.
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p. 1297 - 1301
(2007/10/03)
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- SELECTIVE ALKYLATIONS OF 1,2,4-TRIAZOLE AND BENZOTRIAZOLE IN THE ABSENCE OF SOLVENT
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Alkylation of 1,2,4-triazole and benzotriazole has been performed either in basic media under solvent free phase transfer catalysis conditions or in the absence of base by conventional and microwave heating.Several parameters affecting the selectivity have been studied.In the case of triazole alkylation, microwave irradiation produces specific (non thermal) effects both on reactivity and selectivity.
- Abenhaim, David,Diez-Barra, Enrique,Hoz, Antonio de la,Loupy, Andre,Sanchez-Migallon, Ana
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p. 793 - 802
(2007/10/02)
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- Cyanide process for the preparation of 4H-1,2,4-triazoles
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This invention relates to a novel process for the preparation of 4H-substituted-1,2,4-triazoles. In this process, 4H-substituted-1,2,4-triazoles are prepared by the reaction of an amine with hydrazine and a nitrile.
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