使溴化

The originalprocedure has subsequently been replaced by milder and more environmentallyfriendly conditions. We tried to alkylate 3,4,5-trimethoxytoluene by2-allylphenylbenzyl ether in the presence of N-bromosuccinimide.

本实验是在溴代琥珀酰亚胺的作用下使2-烯丙基苯基苄基醚产生苄正离子，苄正离子亲电进攻3，4，5-三甲氧基甲苯从而进行傅氏烷基化反应的。

Through esterification of functionality —COOM on side chains of xanthan gum by 1-bromooctane,water soluble hydrophobically modified xanthan gums of octyl substitution 11 and 21 per 100 structural units,HMXG-C8-11 and-21,are prepared.

用1-溴代辛烷使黄原胶XG侧链上的—COOM基团酯化，得到以100结构单元计取代度为11和21的水溶性疏水改性黄原胶HMXG-C8-11和-21。

More prophase and prometaphase cells may be obtained by this technique.

在培养基中加入5-溴脱氧尿嘧啶核苷使细胞同步化6—8小时，可以得到较多的前期和前中期分裂细胞。

In the arylation reaction, the temperature was meliorated from -40℃ to -15℃, which could be easy controlled with ice-salt bath. Furthermore, the reaction could be carried out reposefully by adding the initiator.

其中在以2，5-二氟溴苯格氏试剂进行芳基化反应时，改进了反应条件，克服了文献使用的低温条件(-40℃)，简便了操作，同时通过加入合适的引发剂，使反应能够平稳进行。

Results The synthesis condition was improved. The method of methane sulfonic acid/DL-methionine was found an ideal substitute of BBr3 for less cost. While using hydrobromic acid, the O-demethylation and hydrolyzation could be combined in one stage.

结果 优化了纳洛酮的合成工艺，甲磺酸／DL-甲硫氨酸法试剂价格低廉，可降低生产成本；而氢溴酸法不但试剂价格更低，还可将去氧甲基化和水解合并为一步反应，使新工艺的总收率提高到59.90%，产品质量符合中国药典。

In the case of decorative zinc electroplatings, a further enhancement of the appearance of such substrates in addition to the corrosion resistance imparted is achieved by the passivate film which ranges from a clear bright to a light blue bright appearance simulating that of a chromium deposit or alternatively, a clear light-yellow appearance simulating that obtained by use of prior art hexavalent chromium solutions.

可选择的治疗方法，可进一步遏制卤化物包括氟离子、氯化物和溴化物离子进一步增加了硬度钝化膜以及一个或多个兼容为实现高效润湿剂接触基板对待。现在的发明特别地可适用但是不限制在碱而产生酸非氰化物的锌的治疗使电解沉积传授对被对待的基体改良的腐蚀抵抗和装饰的外表。

And discuss some key point of integrated management system design, include hazard identification and risk assessment and risk control in the occupational health and safety management, the measure of satisfaction target of customer, the flawlessness of law system, the integration of the integrated management system and enterprise standardization system, unify lead institution and work orgnization, integreted internal audit and integrated management review.

同时，论述了一体化管理体系构建中的几个主要问题，包括职业健康安全管理中的危险源辨识、风险评价和风险控制、顾客满意度的科学监测、法律、法规体系的完善、一体化管理体系与企业标准化体系的有机结合、统一的领导机构和工作机构、一体化的内部审核和管理评审。

Deepwater Taranaki is investigated for its petroleum potential, using all available seismic data tied to shallow-water wells.

运用与浅水井相关的现有全部震波探测数据考察了深海区塔拉纳基盆地的油藏前景。