如果按照规格使用和储存,则不会分解。
偶氮二异丁酸二甲酯广泛应用于纺织、塑料和油墨等工业领域,作为一种油溶性的偶氮类引发剂,主要用作染料和颜料的中间体。
合成方法如下:在装有冷凝管、搅拌器、导气管及温度计的250 mL四口烧瓶中加入33.2 g (0.2 mol) 偶氮二异丁腈肼(HAIBN),再加入150 mL CH₃OH,搅拌至完全溶解。随后在冰水浴冷却下通入18.2 g (0.260 mol) Cl₂,并继续搅拌反应1小时。之后再通入5.9 g (0.16 mol) HCl,混合物于20~25℃搅拌反应18小时。滤出固体产物后加入80 mL水进行水解。冷冻反应混合物,过滤析出的固体物质,并用甲醇水溶液重结晶得到白色固体偶氮二异丁酸二甲酯19.6 g,收率93.6%,纯度为99.3%,熔点28~30℃。红外光谱(KBr,cm⁻¹)显示特征峰位于1740 cm⁻¹ (C=O);氢核磁共振谱(CDCl₃,δ)结果表明其结构中存在1.49 [s, 12H, -C-CH₃] 和3.65 [s, 6H, -OCH₃]。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | Azobis(n-butylcarboxypropane) | 21302-38-5 | C16H30N2O4 | 314.425 |
Prior to adolescence, the rates of depression are similar in girls and boys, or are slightly higher in boys. However, with the onset of puberty, the gender proportion of depression dramatically shifts to a 2:1 female to male ratio. What is the relationship between menarche and the onset of major depression in early adolescence? A recent theoretical model proposes that vulnerability to depression may be rooted in normal female hormonal maturational processes and gender socialization. Information regarding the management of depression in adolescent and young adult women is provided, including gender differences in the presentation of depressive symptoms, instruments to facilitate assessment, and treatment options. Pubertal and other hormonal changes should be monitored prospectively along with individual, genetic, constitutional, and psychological characteristics. The burden of illness associated with onset of depression following menarche reinforces the importance of expeditious recognition and intervention.