苯甲酸苄酯

The experiment showed that this separation method is feasible and benzyl benzoate with purity about 90% and fluorenone products with purity of more than 85% were obtained. Furthermore the effects of tower top pressure, temperatures of tower top and bottom, reflux ratio on product purity were analyzed.

试验表明该方法是切实可行的，并获得了纯度为90%左右的苯甲酸苄酯产品和85%以上的苏酮产品；同时探讨了塔顶压强、塔顶和塔釜温度、回流比变化对产品纯度的影响，获得了试验条件下的最佳操作条件。

Of the total volatile substances detected; the major volatile compounds were borneol, isoborneol and benzyl benzoate.

主要挥发性组分是冰片、异冰片和苯甲酸苄酯。

Benzyl p amino benzoate ; PTC ; synthesis ; orthogonal design.

对氨基苯甲酸苄酯；合成；相转移催化；正交设计

Methods: A Diamonsil C18 column was used with the mobile phase of 0.1% ammonium acetate solution-methanol (10:90) at the detection wavelength of 240 nm. The flow rate was 1.0 mL/min. Benzyl benzoate was used as internal standard.

采用Diamonsil C18柱，流动相为0.1%乙酸铵溶液：甲醇(10：90)，流速1.0 mL/min，检测波长240 nm，以苯甲酸苄酯为内标。

If rugs cannot be removed, follow this procedure weekly: Apply benzyl benzoate moist powder or 3% tannic acid, then vacuum using a cleaner with an effective filtration system

如果地毯不能拿掉，每周按以下过程处理：把苯甲酸苄酯潮湿粉或3％单宁酸洒在地毯上，然后用真空吸尘器吸尘。

The fraction of benzyl benzoate and fluorenone were enriched from benzoic acid residua by flash distillation,then separated by vacuum batch distillation,so the recovery of benzoic acid residua was implemented.

依据相关文献确定了通过闪蒸法富集苯甲酸釜残液中的苯甲酸苄酯和芴酮馏分，其后减压间歇精馏分离富集馏分，实现了苯甲酸釜残液的回收利用。

The relationship between glycosidic precursors and its aroma components was studied. The results showed: The dominant aroma constituents in aroma oil of jasmine tea include benzyl acetate, linalool, methyl antyranilate, cis-3-hexenyl benzoate, benzyl alcohol, indole, farnisene, methyl benzoate, methyl salicylate, geraniol, cis-3-hexenyl-acetate etc.; and the higher the concentration of these components is, the higher the quality of jasmine tea is.

结果表明：茉莉花茶香精油中，含量较高的有乙酸苄酯、芳樟醇、邻氨基苯甲酸甲酯、苯甲酸顺-3-己烯酯、苯甲醇、吲哚、法尼烯、苯甲酸甲酯、顺-3-己烯酯、水杨酸甲酯、橙花叔醇、乙酸顺-3-己烯酯、香叶醇；这些成分的含量随花茶品质的提高而增多；研究表明，花茶的高含量香气成分也是茉莉花中的主要赋香成分。

Suitable water-immiscible organic solvents include aromatic hydrocarbons, eg toluene, xylene, naphthalene, tetrahydronaphthalene and methyl naphthalene; chlorinated aromatic hydrocarbons, eg chlorobenzene, fluorobenzene, chloronaphthalene and bromonaphthalene; esters, eg butyl acetate, ethyl acetate, methyl benzoate, ethyl benzoate, benzyl benzoate, butyl benzoate, phenylethyl acetate, butyl lactate, benzyl lactate, diethyleneglycol dipropionate, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di(2-ethylhexyl) phthalate; alcohols having six or more carbon atoms, eg hexanol, octanol, benzyl alcohol, phenyl ethanol, phenoxy ethanol, phenoxy propanol and phenoxy butanol; ethers having at least 5 carbon atoms, preferably C 5-14 ethers, eg anisole and phenetol; nitrocellulose, cellulose ether, cellulose acetate; low odour petroleum distillates; turpentine; white spirits; naphtha; isopropylbiphenyl; terpene; vegetable oil; mineral oil; essential oil; and natural oil; and mixtures of any two or more thereof.

适用于水互溶的有机溶剂包括芳香族碳氢化合物，如甲苯，二甲苯，萘，四氢萘和甲基萘；氯代芳香族碳氢化合物，如氯苯，氟，氯萘和萘；酯类，如醋酸丁酯，醋酸乙酯，苯甲酸甲酯，苯甲酸乙酯，苄酯，苯甲酸正丁酯，苯，醋酸丁酯乳酸，乳酸苄，二甘醇二丙酸酯，邻苯二甲酸二甲酯，邻苯二甲酸二乙酯，邻苯二甲酸二丁酯，二（2乙基己基）酯；醇有6个或更多碳原子，如己醇，辛醇，苯甲醇，苯乙醇，苯氧基乙醇，丙醇和苯氧基苯氧丁醇；醚至少有5个碳原子，最好荤5-14醚，如苯甲醚和phenetol；硝化棉，纤维素醚，醋酸纤维素，低气味石油蒸馏；松节油；白酒，石脑油isopropylbiphenyl；萜类，植物油，矿物油，挥发油；和天然油，以及任何两个或两个以上其混合物。

Benzyloxy benzoyldimethylsulfoxide was prepared by the reaction of ethyl 4-benzyloxybenzoate and dimethyl sulfoxide in the presence of sodium hydride, followed by Pummerer reaction with concentrated hydrochloric acid to afford eo-hydroxy-co-thio-methyl-(4/-benzyloxy) acetophenone, which reacted with urea, thiosemicarbazide, semicarbazide hydrochloride and o-phenylenediamine to give imidazolidine-2,4-dione, l,2,4-triazine-3- one and quinoxaline derivatives, respectively.

本文用4-苄氧基苯甲酸乙酯和二甲亚砜为原料，在氢化钠存在下反应，合成了(4′-苄氧基)-苯甲酰基-二甲亚砜。研究了该亚砜在浓盐酸的存在下发生的Pummerer重排反应，用重排产物ω-羟基-ω-甲硫基-(4′-苄氧基)-苯乙酮分别与尿素、氨基脲、氨基硫脲和邻苯二胺反应合成了2，4-咪唑啉-二酮、1，2，4-三嗪-3-酮、喹喔啉等含氮杂环化合物。

In this article, the preparation of benzyl 4-hydroxybenzoate in water was reported, with 4-hydroxybenzoic acid and benzyl chloride as main raw materials, cetyl trimthylamonium bromide as phrase transfer catalyst.

采用改进工艺，以正十六烷基三甲基溴化铵为相转移催化剂，水为溶剂，对羟基苯甲酸和氯化苄为主要原料，合成对羟基苯甲酸苄酯。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。