甲基

The result indicated that MgO and α- methacrylic acid can together thicken epoxy, and the speed of thickening epoxy become quickly with the increasing content of MgO; when the ratio of MgO and α- methacrylic acid is 3:1, thickening epoxy have a better effect; the thickening mechanism: the terminal corboxyl group of α- methacrylic acid react with MgO, and it accompany with large numbers of heat, the heat can accelerate the reaction between the terminal corboxyl group with the secondary hydroxyl groups of epoxy, intermolecular hydrogen bonding which the water of above-mentioned formation result in and complex compound which format the metal atoms and carbonyl group complexing collective increase the viscosity of epoxy resin.

结果表明：MgO和α－甲基丙烯酸配合可增稠环氧树脂，随着MgO加入量的增加，环氧树脂增稠的速度加快；MgO与α－甲基丙烯酸为3：1时，增稠环氧树脂的效果较好；推测环氧树脂的增稠机理是α－甲基丙烯酸中的端羧基与氧化镁反应，放出热量促使其端羧基与环氧树脂中的仲羟基反应，上述反应生成水产生的氢键和羰基与氧化镁中的金属原子形成络合物共同导致环氧树脂的粘度增加。

A process for synthesis of-2-{[4-(3-methoxypropoxy)-3-methyl-pyridin-2-yl]methyl- sulfinyl}-1H-benzimidazole from 2,3-lutidine was studied.

以2，3-二甲基吡啶为起始原料，经过11步反应，不对称合成了质子泵抑制剂的关键中间体：-2-{[4-(3-甲氧基丙氧基)-3-甲基吡啶-2-基]甲基亚硫酰基}-1H-苯并咪唑。

Benzyl isopropyl ether also forms CCT complex with oxygen on the benzene ring like phenyl isopropyl ether, but it is easy to oxidize since charge transfer and 〓 transfer may occur at the methylene group adjacent to the benzene ring, which result in the oxidation of the methylene group.(4) The 〓-CCT complex and the initial dark oxidation mechanism of poly were studied.

虽然苄基异丙醚也以苯环与O〓形成CCT复合物，但它却容易发生暗氧化，这是由于与苯基相连的是亚甲基，此时电荷转移发生在苯环与亚甲基之间，引起亚甲基的氧化，而不是异丙基的氧化。

Disclosed is a method to prepare 3, 3-dimethyl butyric acid chloride, relating to an organically synthesized intermediated compound and particularly relating to a method to prepare 3, 3-dimethyl butyric acid chloride from 3,3-dimethyl butyric acid and phosphorus trichloride.

3，3-二甲基丁酰氯的制备方法，涉及一种有机合成中间体，尤其是涉及一种由3，3-二甲基丁酸与三氯化磷反应制备3，3-二甲基丁酰氯的方法。

Treatment of pterin (2-amino-4-hydroxy-pteridine) derivatives with N,N-dimethylformamide dimethylacetal [1,(CH 3) 2NCH(OCH 3) 2] usually gave corresponding N 2-(N,N-dimethylaminomethylene)- pterin derivatives in polar solvents.

用N ，N 二甲基甲酰胺缩二甲醇 [(CH3 ) 2 NCH(OCH3 ) 2 ，1]和蝶呤(2 氨基 4 羟基蝶啶)衍生物在极性有机溶剂中反应一般得到脒化产物：N2 (N ，N 二甲基氨基亚甲基)-蝶呤衍生物。

By further comparing the retention time of the profounds and that of the impurities,the main impurities in triadimefon technical was conformed as following:First, 1-(4-bromophenoxy)-3,3-dimethyl-1 -(1H-1,2,4-triazol-1 -yl)-2-butanone;Second, 1-(2,4-dichlorophenoxy)-3,3-dimethyl-1 -(1H-1,2,4-triazol-1 -yl)-2-butanone;Third, 1,1 -bis(4-chlorophenoxy)-3,3 -dimethy 1-2-butanoneour conclusion is conformed right.

再经过化合物的保留时间与杂质保留时间的比照，证实了三唑酮原药中的主要杂质是：杂质Ⅰ：1-(4-溴苯氧基)-3，3-二甲基-1-(1H-1，2，4-三氮唑-1-基)-2-丁酮；杂质Ⅱ：1-(2，4-二氯苯氧基)-3，3-二甲基-1-(1H-1，2，4-三氮唑-1-基)-2-丁酮；杂质Ⅲ：1，1-二(4-氯苯氧基)-3，3-二甲基-2-丁酮。

Ingredients: olive extract,whitening factor,squalane, caprylic/decanoic acid glycerol ester, methyl silicone oil, dimethyl silicone oil, rrimethylglycine, xanthane.

成分：橄榄提取液，美白因子，合成角鲨烷，辛酸癸酸甘油酯，环甲基硅油，二甲基硅油，三甲基甘氨酸，汉生胶。

Ingredients: lemon extract, honey,whitening factor, squalane, caprylic,decanoic acid glycerol ester, methyl silicone oil, dimethyl silicone oil, rrimethylglycine, xanthane

成分：柠檬提取液，蜂蜜，美白因子，合成角鲨烷，辛酸癸酸甘油酯，环甲基硅油，二甲基硅油，三甲基甘氨酸，汉生胶

Ingredients: shea butter extract,whitening factor, moisturizing factor,squalane, caprylic/decanoic acid glycerol ester, methyl silicone oil, dimethyl silicone oil, rrimethylglycine, xanthane.

成分：乳木果提取液，美白因子，保湿因子，合成角鲨烷，辛酸癸酸甘油酯，环甲基硅油，二甲基硅油，三甲基甘氨酸，汉生胶。

The effect of low temperature treatment on DNA methylation level decrease revealed some variety differences. The DNA methylation level in stem apices of the spring radish cultivar'Duanye 13'was somewhat easy to be decreased by low temperature treatment, but that of the winter radish cultivar'Yidianhong'did not decrease when the germinated seeds were treated at 10℃ for 10 days.

萌动种子低温处理降低DNA甲基化水平的效果在品种间存在一定差异，春性品种'短叶13'其DNA甲基化水平比较容易被降低，而冬性品种'一点红'的萌动种子在10℃下处理10d尚不能降低其DNA甲基化水平。

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。