烷类

The novel title compound was synthesized with benzaldehyde, isobutyraldehyde, phosphorus trichloride as raw materials. The total yield was 40.8%. The structure was confirmed by 1H NMR, 31P NMR and elemental analysis.

摘要以苯甲醛、异丁醛、三氯化磷为原料合成了新型的1，3，2-氧磷杂环类化合物2-苯羟甲基－5，5-二甲基－4-苯基－2-氧代－1，3，2-二氧磷杂环己烷，总收率为40.8%，并对其进行了NMR研究和结构表征。

Isolation and identification results of volatile compounds showed that aldehydes, alcohols and ketones were the major volatile compounds formed in the processing of XUANWEI ham, and had the highest relative contents in the 6-month-old, which were 11326.18, 947.29 and 554.95 μg nonane 100g-1, respectively. The result was relevant to intense hydrolysis of intramuscular fat in the pre-processed ham (4-month-old).

挥发性化合物的分离鉴定结果表明：醛、醇和酮类是火腿加工过程中形成的主要挥发性化合物，在6月龄时，它们的相对含量最高，分别为11326.18、947.29和554.95μg壬烷／100 g，此结果与加工前期（4月龄）肌内脂肪发生强烈水解相关。

ATA was found to exhibit more distinctive cytotoxicity toward human cervical squamous carcinoma HeLa cells than oleanolic acid, which suggested that the position of the carboxyl group significantly affects the cytotoxicity of oleanane-type pentacyclic triterpenes with a carboxyl group.

周晓华被发现展品更为鲜明的细胞毒性，对人体颈部鳞癌Hela细胞比齐墩果酸，这表明的立场与羧基显着影响细胞毒性的齐墩果烷型pentacyclic三萜类化合物与羧基。

Seven of them have not been reported.Their structures were confirmed by IR,~1HNMR,MS,and element analysis. 4.Meanwhile,the green methylation procedure of imides was developed by using dimethyl carbonate as methylation reagent.A series of imides,for example,phthalimide,3,4-dibromo-maleimide and succincide were used for substrates.The effects of DABCO(1,4-diazabicyclo [2.2.2]octane)and DBU(1,8-diazabicyclo[5.4.0]undec-7-ene)as a catalyst in this kind of reactions were investigated.2-Bromo-3-(1-methylindolyl-3-yl)-1-methyl-1H-pyrrole-2,5-dione was prepared by using dimethyl carbonate,which further expanded the use of dimethyl carbonate,as a green agent in organic synthesis.

在以硫酸二甲酯为甲基化试剂对3，4-二溴马来酰亚胺进行N-甲基化反应合成3，4-二溴-N-甲基马来酰亚胺的同时，以碳酸二甲酯为甲基化试剂，对3，4-二溴马来酰亚胺、邻苯二甲酰亚胺、琥珀酰亚胺等酰亚胺类化合物的N-甲基化反应进行了研究；考察了1，4-二氮杂双环[2.2.2]辛烷，1，8-二氮杂双环[5.4.0]十一碳-7-烯、碳酸钾和四丁基溴化铵等作为催化剂对碳酸二甲酯N-甲基化反应的反应时间和收率等的影响，并应用碳酸二甲酯为甲基化试剂，合成了N-甲基-3-溴-4-(1-甲基-吲哚-3)-马来酰亚胺。

A reduction-coupling-etherification reaction between aromatic aldehydes or ketones (1) and alcohols ( 2 ) to yield corresponding diether ( 3 ) of pinacol in the presence of tin and chlorotrimethylsilane.

在三甲基氯硅烷、四氢呋喃体系中，芳香醛、酮和醇在金属锡的作用下发生还原-偶联-醚化反应生成相应的频那醇二醚类化合物。

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化工产品类，化工原料：无机酸，钠化合物，钾化合物，钙化合物，钡化合物，锰化合物，铬化合物，镍化合物，锌化合物，镁化合物，铝化合物，单元素化工品，什项五机化工品，石蜡、蜡类其他化工品，焦、油化工品，醇、醛化工品，酯化工品，酮、醚、酚化工品，烷、烯、炔化工品，胺化工品，芳烃化工品，什项有机化工品，羧酸化工品，其它化工原料，染料及中间体，颜料原料，塑料原料，农用化工品：化肥，农药，生长剂，农膜等，器材，引火合金，易燃材料制品，化学试剂，橡胶，进口，机械设备，机械及设备，仪器；摄影器材；印刷器材；通用机械；纺织器材；机械基础件；各种成套设备，中国上海，浙江，广东，江苏优质，低碳，新颗科技商品生产商，出口商，批发商，贸易商，美国，美利坚合众国进口商，批发商，零售商，投资商，设计师，规划师们，请与我处联系，George Chen，Mobile：+

Periplocoside A, a pregnane glycoside, is a new nature product compound isolated from P. sepium Bge.

本研究报导了从北五加皮中提取出来的一个新的孕烷苷类化合物杠柳苷A (Periplocoside A， PSA)。

Teasaponins is a mixture of oleanene-type triterpene saponin that extracted from theaceae camellia plants. It has many bioactivities as well as fine surface activity.

茶皂素是从山茶科山茶属植物中提取出来的一类齐墩果烷型三萜类皂甙的混合物。

Diamines are performed. An new and effective atom economy, domino reaction is developed, and 5, 6dihydro-4H-thieno [2, 3-b] thiopyran are synthesized by 4-(4-methyl-1, 3-dithiol-2-ylidene)-1, 7-diaryl-1, 6-diene-3, 5-dione

然后以4-[（4-甲基-1，3-二噻烷-2-亚甲基）-1，7-二芳基]-1，6-二烯-3，5-二酮类化合物为合成子探索稠杂环合成方法，并发现一个高效的，具有原子经济性的多米诺效应合成方法，并成功的利用其合成了一系列噻喃并噻吩衍生物。

Synthesis of 7, 3', 5'-Trisubstituted Flavanones and Flavonols

篇名 7， 3'， 5'-三取代黄烷酮和黄酮醇类化合物的合成

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。