Efficient method for the synthesis of 2-(3-arylbenzo[f]quinolin-2-yl)ethanol derivatives through an unusual ring-opening of THF-involved reaction

An efficient synthesis of 2-(3-arylbenzo[f]quinolin-2-yl)ethanol derivatives by an unusual THF-involved reaction of aromatic aldehyde and naphthalen-2-amine promoted by iodine has been demonstrated with good yields. The ring-opening of THF reaction is proposed in the possible mechanism.     

Gas chromatographic determination of aromatic amines in water samples after solid-phase extraction and derivatization with iodine: I. Derivatization

A new method for the selective determination of aromatic amines is presented, which is based on the solid-phase extraction at pH 9 and subsequent derivatization of the analytes to the corresponding iodobenzenes. These can selectively and sensitively be determined with gas chromatography and electron-capture detection. Separation of at least 30 compounds in a single chromatographic run in 30 min is possible. With this method, 56 aromatic amines were investigated, and only in six cases no derivatives were obtained. Limits of quantitation were between 0.5 and 8 μg l⁻¹, but may still be lowered with higher sample volumes or different injection techniques. The application to water samples revealed the suitability for the investigation of ground, leachate and wastewater.     

Iodine as a novel and efficient reagent for the synthesis of α-aminonitriles by a three-component condensation of carbonyl compounds, amines, and trimethylsilyl cyanide

A straightforward and general method has been developed for the synthesis of α-aminonitriles by simply combining aldehydes or ketones, amines, and trimethylsilyl cyanides in the presence of a catalytic amount of molecular iodine at room temperature.     

Direct oxidative conversion of aldehydes and alcohols to 2-imidazolines and 2-oxazolines using molecular iodine

Aldehydes were converted to the corresponding 2-imidazolines and 2-oxazolines in good yields by the reaction with ethylenediamine and aminoethanol, respectively, using molecular iodine and potassium carbonate. Moreover, primary alcohols were directly converted to the corresponding 2-imidazolines and 2-oxazolines via aldehydes in one-pot manner with ethylenediamine and aminoethanol, respectively, using molecular iodine and potassium carbonate.     

Ring-opening reactions of diarylvinylidenecyclopropanes by iodine and bromine

Diarylvinylidenecyclopropanes undergo a novel ring-opening reaction upon treatment with iodine or bromine at 0-25 °C in 1,2-dichloroethane to give the corresponding iodinated or brominated naphthalene derivatives in good to high yields within 3 h. The further transformation of the corresponding iodinated or brominated naphthalene derivatives has been disclosed.     

Kinetics and mechanism of the addition of iodine monochloride to some alkenes in nitrobenzene solvent. Effect of polarity of the solvent

The kinetics of the addition of iodine monochloride (ICl) to some vinyl compounds in nitrobenzene solvent was investigated. In all cases the reaction follows second order dependence on ICl and first order on the substrate, making the total order three. Rate constants were measured for each substrate at 20°, 30°, 40° and 50°C.Arrhenius plots were made from which activation energies were evaluated. Other kinetic and thermodynamic parameters are reported. A suitable mechanism is proposed for the reaction and based on this, the various parameters are discussed. Solvent effects are discussed and the data with nitrobenzene and acetic acid solvents are compared.

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Kinetik und Mechanismus der Addition vonICl zu einigen Alkenen in Nitrobenzol als Lösungsmittel. Effekt der Polarität des Lösungsmittels

Zusammenfassung Die Kinetik der Addition von ICl zu einigen Vinylverbindungen in Nitrobenzol als Lösungsmittel wurde untersucht. In allen Fällen ist die Reaktion von zweiter Ordnung hinsichtlich ICl und von erster Ordnung hinsichtlich des Substrats, d. h. mit einer Gesamtordnung von drei. Geschwindigkeitskonstanten wurden für jedes Substrat bei 20°, 30°, 40° und 50°C gemessen. AusArrhenius-Diagrammen wurden Aktivierungsenergien ermittelt und auch andere kinetische und thermodynamische Parameter wurden bestimmt. Ein Mechanismus wird vorgeschlagen, wobei die verschiedenen Parameter diskutiert werden. Lösungsmitteleffekte werden ebenfalls diskutiert und die Daten mit Nitrobenzol und Essigsäure als Lösungsmittel miteinander verglichen.

     

巴盟乌拉特后旗地方性甲状腺肿患病率调查及防治

对乌拉特后旗１４９１０名居民进行了地方性甲状腺肿患病率调查，患病率为５．９４％，属于轻病区。地方性甲状腺肿的患病率在性别和年龄间均存在着显著性差异，男性患病的高峰年龄是１０岁，女性患病的高峰年龄是１５岁－和３０岁－。甲状腺肿大的类型主为弥漫型，占９０．７４％。对患者口服磺化钾治疗，总有效率为９０．９１％。     

水浸泡对海带中碘含量的影响

用能量色散Ｘ射线荧光分析法（ＸＲＦ）研究了水浸泡对海带中碘含量的影响．结果表明，用淡水浸泡海带可使其中８０％的碘损失掉，但仍含碘６００×１０－６～１２００×１０－６，每天食用１～２ｇ经浸泡后的湿海带即可满足成人对碘的日需要量．延长浸泡时间或用盐水浸泡可使海带中碘含量少流失１０％左右。     

间接法测定工业废水中微量苯酚

研究了用吸光光度法间接测定微量苯酚的方法。在KBrO3和KBr溶液中,以淀粉 碘化钾为显色剂,最大吸收波长为590nm,线性范围为0.10～2.00mg·L-1,回收率为92%～110%,NH+4、Ca2+、Fe3+等不干扰测定。该法用于测定工业废水中痕量苯酚,结果满意。     

包头市青山区8～10岁儿童碘缺乏病甲状腺肿大率及尿碘监测分析

调查了内蒙古青山区８～１０岁儿童碘缺乏病甲状腺肿大率，结果表明，甲状腺肿大率为１９．６％，且以城乡结合部居住儿童为高，监测了其尿碘，尿碘水平１００μｇ／Ｌ以下者为１１．２％，其中５０μｇ／Ｌ者了有发现，据此情况，今后仍要强化防治工作。