苯甲基

On the other hand, the hepatic microsomal aminopyrine demethylase activity was obviously inhibited 2 hours after administration of the same dose of SY-801 and SY-640, while the content of hepatic cytochrome P-450 was not affected.

体外实验表明，SY-801和SY-640对正常小鼠、3-甲基胆蒽（3-MC）处理小鼠及苯巴比妥处理小鼠小鼠肝微粒体氨基比林脱甲基酶活性都具有明显的抑制作用，其中对3-MC处理小鼠肝微粒体氨基比林脱甲基酶活性抑制作用最显著。

Picoline was treated with hydrogen peroxide to form intermediate N-oxide-3- methylpyridine then chloridized with benzoyl chloride to form 2-chloro-5-methylpyridine.

以3-甲基吡啶为原料通过过氧化氢氧化得中间产物3-甲基吡啶-N-氧化物，再用苯甲酰氯氯化得到粗产品2-氯-5-甲基吡啶。

Vitamin E, or tocopherol, is a lipid-soluble antioxidant and essential for human health. 2-methyl-6-phytyl-1, 4-benzo- quinol methyltransferase, one of the key enzymes in vitamin biosynthetic pathway in plants, converts 2-methyl- 6-phytyl-1,4-benzoquinol to 2,3-dimethyl-6-phytyl-1,4-benzoquinol.

维生素E是一类人体必需的脂溶性抗氧化剂，具有重要的生理功能。2-甲基-6-叶绿基-1，4-苯醌甲基转移酶是天然维生素E合成途径中的关键酶之一，催化MPBQ甲基化，生成DMPBQ。

Methyl-6-phytyl-1, 4-benzo- quinol methyltransferase, one of the key enzymes in vitamin biosynthetic pathway in plants, converts 2-methyl- 6-phytyl-l,4-benzoquinol to 2,3-dimethyl-6-phytyl-l,4-benzoquinol.

甲基。6。叶绿基。1，4-苯醌甲基转移酶是天然维生素E合成途径中的关键酶之一，催化MPBQ甲基化，生成DMPBQ。

In this paper, 2,6-dimethyl-1,4-phenylene oxidel was modified by trimethyl chlorosilane and triphenyl chlorosilane, and a serfes of silyl-substituted PPO were synthesized.

讨论了聚2，6－二甲基－1，4－苯撑氧与三甲基氯硅烷和三苯基氯硅烷的反应，合成了一系列取代含量不同的三甲基硅取代PPO和三苯基硅取代PPO。

Methyl-2,3,5,6-tetrafluoro-benzene methanol was synthesized by chlorination, acylation, fluorination, esterifica- tion, reduction, bromization, reduction from terephthalic acid. Tefluthrin was obtained from-(1RS,3RS)-3-(2-chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl cycolpropa-necarboxylate acid by reacting with 4-methyl-2,3,5,6-tetrafluoro-benzene methanol.

以对苯二甲酸为原料，经氯化、酰氯化、氟化、酯化、还原、溴化、还原七步反应合成了4-甲基-2，3，5，6-四氟苄醇，甲基苄醇与-(1RS，3RS)-3-(2-氯-3，3，3-三氟丙-1-丙烯基)-2，2-二甲基环丙甲酸一步酯化合成了七氟菊酯。

Thirteen benzimidazole derivatives were synthesized by one-step oxidative cyclisation of 1, 2-phenylenediamine or 4-methyl-1, 2-phenylenediamine at room temperature and a series of aromatic aldehydes under imidazolium salt grafted iodobenzene diacetate assisted.

以水为溶剂，在咪唑盐二醋酸碘苯促进下，通过邻苯二胺或4-甲基邻苯二胺与各种芳醛室温氧化环合，一步合成了13种苯并咪唑类衍生物，反应时间25~45 min，反应产率92%~98%。

An unreported compound 2-cyclopropylbenzimidazolium salt was obtained from 2-cyclopropyl benzimidazole and iodomethane.

以邻苯二胺和环丙基甲酸为原料，以多聚磷酸为催化剂，在微波辐射下合成了环丙基苯并咪唑，用碘甲烷季胺化得到未见文献报道的环丙基苯并咪唑盐，通过苯并咪唑盐与Grignard试剂加成后水解反应制备环丙基甲基酮。

A dynamic generating toxic gas system and a nose-only exposure system were used for the pharmacokinetic study of inhaled environmental contaminants for benzene, toluene, xylene, ethylbenzene,chlorobenzene, styrene, isopropyl benzene, tetrachloroethylene, nonane and methylcyclohexane in male guinea pig.

用动态配气设备和鼻式吸入方式染毒，采用雄性豚鼠对环境中10种挥发性污染物(苯、甲苯、对二甲苯、乙基苯、氯代苯、苯乙烯、异丙苯、四氯乙烯、甲基环己烷和壬烷混合物)的吸入动力学进行了研究。

In order to check the corresponding compound at 31P NMR –45.4 ppm, stable pentacoordinate spirobicyclic 2-phenoxy-1,3-phenylene-dioxo-1,3,2-iminoacetoxyphosphoranes were synthesized through a new and efficient method whereby phosphorus pentachloride was displaced stepwise by catechol, N,O-bisamino acid and phenol, or catechol, phenol and N,O-bisamino acid, their 31P NMR chemical shifts are at about 31P NMR –45.0 ppm, the results showed that the compound 4 at 31P NMR –45.4 ppm was pentacoordinate phosphorane containing amino acid residue.

采用磷谱跟踪来研究上述成肽反应机理。例如在氮气保护下，0.1mmol O，O-亚苯基磷酰氯（1）和0.15mmol N，O-二苯丙氨酸（2）苯溶液加入0.6ml核磁管中，混合均匀，反应过程用磷谱检测。反应1分钟后，起始原料1(δp=19ppm)很快转变成N-磷酰苯丙氨酸的三甲基硅基酯（3）(δp=19.8ppm)，在8分钟内，3完全转变成苯丙氨酸磷烷4(δp =-45.4ppm)，同时出现环磷三酯（6）(δp=3.5ppm)。随着反应的进行，对应于化合物4的峰逐渐变小，而6逐渐变大。

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。