化学性质
这是一种浅黄色粉末(纯品为橙黄色晶体)。其相对密度为1.442(15℃),熔点71.5℃,沸点284℃。该物质能溶于热水、乙醇、氯仿和酸溶液。
用途
橙色基GR适用于染棉、黏胶纤维和蚕丝,并可用于棉布的印花。它与色酚AS偶合可产生红光橙色,其偶合能力强且反应速度快。此外,它可以与多种色酚偶合,生成黄光红、红色或艳红色等颜色。在色酚AS或AS-D打底的棉布上,橙色基GR色浆可以与活性染料一同印花,经过汽蒸后色泽保持不变。
生产方法
以邻硝基氯苯为原料,通过氨化得到产物。具体步骤如下:首先,在高压釜中加入450kg邻硝基氯苯和2280L 27%氨水;然后在约2小时内升温至155℃,停止加热后,反应热会使温度升至180℃,压力约为36-38Pa,并最终达到185-188℃、40Pa左右的条件,持续5小时。自然冷却至60℃后出料,然后降至30℃,用冷水洗涤三次,过滤并干燥滤饼,在50-60℃下干燥48小时,最终得到约390kg纯度达99%的成品干粉。
Reaction of arene diazonium salts with 3-aminocrotononitrile or methyl 3-aminocrotonate affords the 2-aryl-hydrazono-3-oxobutanenitrile (1 or 3 and 3′) or the methyl 2-arylhydrazono-3-oxobutanoate (2 and 2′ or 4 and 4′). A series of these hydrazones has been prepared with a range of electron-withdrawing and -donating substituents in the ortho or para position of the aryl moiety. The hydrazones have been characterized by spectroscopic methods, with emphasis on the 1H NMR spectra, which have been used to determine the configuration of the hydrazones as E or Z or a mixture of the two. The para-substituted hydrazononitriles (1) are formed as a single species, namely the Z isomer, whereas the ortho isomers are formed as a mixture of E and Z configurations (3 and 3′). The hydrazonobutanoates (2 and 2′ or 4 and 4′) are formed as E/Z mixtures regardless of the position of the substituent in the aryl moiety. Complete assignments of all signals in the 1H NMR spectra have been made on the basis of the ability of the various substituents to participate in intramolecular hydrogen bonding and a mechanism is proposed to account for the variations in the proportions of E and Z isomers and the effect of the nature of the substituent on this ratio. 13C NMR spectra of selected hydrazones have been recorded as an aid to structure assignment. Key words: hydrazone, diazonium, NMR spectroscopy, E/Z isomers, crotonic acid derivatives.
Fe3O4@SiO2–BF3 nanoparticles were prepared as a novel solid acid and effectively applied for the solvent-free synthesis of arylazo-1-naphthols at room temperature.