高顺式-二氢茉莉酮酸甲酯的研制

高顺式-二氢茉莉酮酸甲酯（MDJ）作为香料其性能远优于普通MDJ,是各大香精香料公司的招牌产品之一。文中利用普通MDJ与三甲基氯硅烷反应制备出烯醇硅醚,再经溴化、脱溴生成烯烃后再加氢合成出高顺式MDJ,该法比较适合工业化。     

《香料香精化妆品》2009年总目录

高选择加氢方法合成铃兰醛……阎永利等2009／1 1 高顺式-二氢茉莉酮酸甲酯的研制……季根忠等2009／1 5 高效液相色谱法测定化妆品中乙二醛的方法研究……王依春等2009/1 7     

茉莉酮酸酯类香料的合成进展

本文介绍了茉莉酮酸酯类香料化合物茉莉酮甲酯，二氢茉莉酮酸甲酯和γ-茉莉内酯的合成方法及其进展。     

顺式二氢茉莉酮酸甲酯的合成技术改进

以普通二氢茉莉酮酸甲酯为初始原料,N-溴代丁二酰亚胺作为溴代试剂,三乙胺为脱溴试剂,制得脱氢二氢茉莉酮酸甲酯;以Pd/C作催化剂,环己烷作溶剂,在温度为20℃,氢气压力为0.4 MPa下,脱氢二氢茉莉酮酸甲酯经催化氢化合成顺式二氢茉莉酮酸甲酯,经精馏得到的最终产品中顺式产品质量分数为35%。     

茉莉香料化学

本文简述了关于茉莉酮、二氢茉莉酮、二氢异茉莉酮、异茉莉酮、茉莉内酯、γ 甲基癸内酯、顺 7 癸烯 4 内酯、5 羟基 8 癸烯酸内酯、茉莉酮酸甲酯、二氢茉莉酮酸甲酯、二氢异茉莉酮酸甲酯、己基环戊酮、庚基环戊酮、3 甲基 2 异戊烯基 环戊烯酮和茉莉酯等的化学合成方法。     

二氢茉莉酮酸甲酯的简便合成法

茉莉酮酸甲酯是大花茉莉精油的主要成份。一氢茉莉酮酸甲酯是茉莉酮酸甲酯的代用品,它具有优雅而持久的花香,目前已成为十分引入注目的香料。自六十年代以来,人们一直在探索较为简便的合成路线,下面为仅有四步的合成法:先由丁二酸和庚酰氯反应得到2-戊基1,3-环戊二酮;再用甲醇醚化可得到2-戊基-3-甲氧基-环戊-2-烯酮;将该物质与丙二酸二甲酯反应生成(2-戊基-3-酮-1-环戊烯-)基乙酸甲酯,最后催化氢化,便可得到二氢茉莉酮酸甲酯。     

茉莉酮类香料的合成

本文介绍了茉莉酮类香料化合物顺式－茉莉酮、茉莉酮酸甲酯、二氢茉莉酮酸甲酯和茉莉内酯等的保成方法与进展。     

顺式茉莉酮

<正> 顺式茉莉酮是花香型香料中具有代表性的香料。茉莉花是由法国栽培起来的,南意大利、阿尔及利亚、埃及、摩洛哥、希腊等国也有栽培。[编者按:中国也有大量栽培] 作为顺式茉莉酮的关联香料,有茉莉酮酸甲酯,茉莉花内脂,茉莉花酮内脂,二氢茉莉酮、二氢茉莉酮酸甲酯等,其中二氢茉莉酮和二氢茉莉酮酸甲酯已经商品化。 本品是具有果香的茉莉花精油的重要成分之一。     

二氢茉莉酮酸甲酯生产工艺的研究

二氢茉莉酮酸甲酯是一种深受人们喜爱的茉莉香型的重要香原料。本文以环戊酮和戊醛为原料在碱催化下 ,以缩合和异构化反应合成了 2 -戊基环戊烯酮。 2 -戊基环戊烯酮再与丙二酸二甲酯缩合 ,脱羧得二氢茉莉酮酸甲酯 ,并且进行了中试放大 ,确定了最佳工艺条件     

提高二氢茉莉酮酸甲酯香气质量的探索

对二氢茉莉酮酸甲酯合成中从2-戊基-3-氧基-环戊基丙二酸二甲酯水解,脱羧制取成品的工艺进行了探索,提高了香气质量。一、引言二氢茉莉酮酸甲酯是新型合成香料,具有天然的茉莉花香气,是一种珍贵的基质香料。在香精中既有使香气增效的功能,又     

浅谈钢帘线附胶率判定

钢帘线最重要的性能之一是与橡胶的粘合性能,它是影响轮胎寿命的主要因素。粘合性能有两种表示方法,一是粘合力表示法,二是附胶率表示法,粘合力表示法有相应的等级判定,而附胶率表示法无相应的等级判定标准。依据大量实验,结合实际情况,制定了相应判定图谱。     

Positional analysis and determination of triacylglycerol structure ofArgania spinosa seed oil

The distribution of fatty acids between the sn-1, sn-2 and sn-3 positions of triacylglycerols fromArgania spinosa seed oil of Morocco has been determined. Saturated fatty acids showed a preference for external positions. The sn-1 position contained slightly more palmitic acid than the sn-3 position, whereas stearic acid was preferentially esterified at the sn-3 position. Linoleic acid occurred predominantly in the sn-2 position with lesser amount evenly distributed between the sn-1 and the sn-3 positions, as generally found in vegetable oils. Oleic acid was distributed with a slight preference shown for the internal position, whereas the distribution between the external positions revealed a slight preference for the sn-1 position. The distribution of the triacylglycerols determined from high-performance liquid chromatography (HPLC) is at variance with that calculated from the 1-random 2-random 3-random distribution theory. This is particularly true for trioleoyl and trilinoleoylglycerols. In contrast, the agreement between theory and experiment is good for triacylglycerols containing two oleoyl and one linoleoyl chains, one oleoyl, one linoleoyl and one palmitoyl chains or one oleoyl, one palmitoyl, and one stearoyl chains.     

On the evaluation of synthetic and natural ilmenite using syngas as fuel in chemical-looping combustion (CLC)

Chemical-looping combustion (CLC) is a combustion technique where the CO₂ produced is inherently separated from the rest of the flue gases with a considerably low energy penalty. For this reason, CLC has emerged as one of the more attractive options to capture CO₂ from fossil fuel combustion. When applying CLC with solid fuels, the use of a low cost oxygen carrier is highly important, and one such low cost oxygen carrier is the mineral ilmenite. The current work investigates the reactivity of several ilmenites, some which are synthetically produced by freeze granulation and two natural minerals, one Norwegian ilmenite and one South African ilmenite.     

纤维素连续酶解装置的混合输送器性能研究

设计了一种用于纤维素酶解的卧式平推流连续酶解反应器，以实现酶解工艺的连续化生产。应用Polyflow软件，分析了不同类型混合输送器在纤维素酶解混合物料处于高黏度时期的混合、输送、返混、功耗及破碎性能。结果表明：等外径混合输送器的功耗最低，输送能力一般，混合、返混及破碎性能较差；变外径混合输送器混合、返混、破碎性能比等外径混合输送器要好，但输送和功耗性能一般；内外螺带型混合输送器的混合、输送、返混及破碎性能均较好，功率耗能稍高，但基本与其他两种形式混合输送器功耗水平一致。对上述性质进行综合评价，得到结论：内外螺带型混合输送器更适合纤维素物料处于高黏度阶段时的连续酶解。     

油-水旋流分离器计算流体力学模拟效果分析

油-水旋流分离器是一种新型的水力旋流设备之一。在石化等行业中显示出越来越广泛的应用前景。掌握旋流分离器内液体的流动特性对旋流分离器的应用是非常重要的。利用计算流体力学（CFD）软件对其流体的分析是分析方法之一。通过CFD对油-水旋流分离器内流态的三维数值模拟,发现这种研究方法存在一定的局限性和不完全性,如所采用的迭代次数就对液分离器的模拟效果有著明显的影响。     

Synthesis and evaluation of TAC-based inhibitors of papain as mimics of cystatin B

An approach for mimicking protein-protein interactions by using a discontinuous epitope to construct a mimic that is about one tenth of the size of a natural inhibitor of papain, namely, cystatin B, is described. The discontinuous epitope of cystatin B, which is involved in the interaction with papain, was mimicked by synthesis of a tripodal molecular construct by using the triazacyclophane (TAC) scaffold. The mimic contains three peptide arms: one that mimics the N terminus, one that mimics the C terminus, and one that mimics the beta-hairpin loop structure of cystatin B. These peptide sequences were assembled on the TAC scaffold. The resulting cystatin mimic, CysTACtin 9, showed excellent inhibition of papain with a K(i) of 12 nM, which approaches the inhibitory potency of cystatin B (K(i)=0.12 nM). Experiments with molecular constructs that contained one or two arms or a mixture of the nonscaffolded peptides showed that both scaffolding and the presence of the three peptide arms are crucial for a successful mimic.     

Comparing two‐step and one‐step chromatic adaptation transforms using the CAT16 model

Color‐appearance models, CIECAM02 and CAM16, usually include two one‐step chromatic adaptation transforms: a forward (one‐step) transform to convert data from a first illuminant to CIE illuminant E, plus a reverse (one‐step) transform to convert the results from CIE illuminant E to a second illuminant. In practice, however, one‐step chromatic adaptation models, that avoid the use of the intermediate CIE illuminant E, are also employed. Tests using the one‐step CAT16 model indicate failures of both the symmetry and transitivity properties, except in the case where the degree of adaptation D is equal to unity. The magnitude of these failures depends on the specific illuminants selected, and increases as the degree of adaptation decreases. From four possible two‐step CAT16 models, we have identified two that obey the symmetry and transitivity properties, one with slightly better predictions of the experimental corresponding‐color datasets available in the literature, and more consistent with the one‐step CAT16 model. The findings of this article confirm that, for incomplete adaptation, the use of the one‐step CAT is incorrect, and we propose that the use of a two‐step CAT16 model be mandatory for future applications.     

单向芳纶/玻璃纤维混杂复合材料板材拉伸性能研究

本文对单向芳纶/玻璃纤维复合材料进行制作,对其纵向拉伸强度、拉伸模量和弹性伸长进行实验分析。实验结果表明,单向混杂复合材料的拉伸断裂大多为多次性,界面数越多,一次性断裂的可能性越大。界面数为1的混杂纤维复合材料的芳纶纤维体积含量在对拉伸强度影响上的存在临界值,表现出明显的混杂效应。界面数大于1的混杂复合材料在芳纶纤维铺层数一定的情况下,界面数的多少不影响混杂复合材料拉伸强度和拉伸弹性模量的大小。界面数大于1比界面数为1的复合材料的拉伸强度和拉伸模量明显偏高。同时对不同制作条件下纯玻璃纤维单向复合材料的拉伸性能进行剖析。     

矿体与矿柱不垂直时矿柱强度的估算

本文提出了在缓倾斜、倾斜、急倾斜矿体与矿柱不垂直时矿柱强度的估算方法，用等效宽度代替实际宽度考虑了矿柱与矿体不垂直时对矿柱强度削弱的影响这一重要因素。     

The autoprotonation in reduction mechanism of pesticide ioxynil

The reduction mechanism of ioxynil (3,5-diiodo-4-hydroxy-benzonitrile) was studied in dimethylsulfoxide using the electrochemical methods (tast polarography, cyclic voltammetry and controlled potential electrolysis) combined with GC/MS identification of products. The reduction is accompanied by the cleavage of iodide yielding 3-iodo-4-hydroxybenzonitrile. Surprisingly, this process requires only one electron for the exhaustive electrolysis of the starting compound. We showed that the apparent one electron reduction observed in the aprotic solvent is due to the autoprotonation by another molecule of ioxynil. The overall one electron reduction (uptake of two electrons per two molecules of ioxynil) is changed in the presence of a strong proton donor to a two electron process per one molecule.