化合

One of the 863 National Scientific and Technological Innovation Projects of China, Backed by the strong technical force of Yantai Wanhua Group, which has developed a unique core process technology of "macromolecule polymerization harening structure", under the unique chemical combination of environment-friendly polyurthane adhesive, and in conjunction with the complete production line for new-type strawboard, which isuniquely developed and continually upgraded by our company, a new generation of environmental substitute for wood panels, the first of its kind in China, is developed --- ecological board.

在吸收了国外先进技术的基础上，依托万华集团强大的科研力量，独创的"高分子聚合固化结构"核心工艺技术，以聚氨酯生态胶粘合剂独特的化合作用，配合我公司独家开发研制并不断完善升级的新型秸杆均质板生产线成套设备，生产出国内首创的无公害新一代木质人造板的最佳替代品--生态板材。

When the two gases previously mentioned are mixed in the presence of a filament of platinum, they form sulphurous acid.

前面提到的两种气体和那根细细的铂金丝混合，它们就会化合成亚硫酸。

The necessary conditions for a ternary alloy phase to form in nanometer powders are that the components can compound or solid solute each other,and there is a proper composition range for the master alloy.

三种组元间能够相互化合或固溶是在纳米粉末中形成三元化合物相的必要条件。此外，母合金的成分范围还必须合适。

In the process of laboratory study, oxycodone was prepared by oxidating thebaine at 6,14-position under oxydol, hydrodeoxidizing 7,8-position double bond and 14-position ether under palladium catalyst. Furthermore, N-methyl of oxycodone was isolated byα-chloro-ethyl chloroformate under anhydrous condition and protection of 14-position hydroxyl to obtain noroxycodone, which was further converted into methylnaltrexone by N-alkylation in presence of cyclopropyl bromomethane, then by isolating 3-position methyl of methylnaltrexone under boron tribromide, becoming hydrochloride to prepare target compound, natrexone hydrochloride.

实验室工艺方面，本文首先用双氧水氧化蒂巴因的6-位和14-位、在钯炭催化下加氢还原7-8位双键和14-位醚合成羟考酮，然后提出并优化了在无水和14-位保护的情况下，用氯甲酸-α-氯乙酯脱去羟考酮的N-位甲基合成去甲羟考酮，再用环丙甲基溴将去甲羟考酮的N-位烷基化合成甲基纳曲酮，最后采用三溴化硼脱去甲基纳曲酮的3-位甲基和成盐酸盐合成盐酸纳曲酮。

Oxidative methylation of toluol to styrene is a new process studied widely recently.

甲苯氧化甲基化合成苯乙烯是目前正在探讨的合成苯乙烯的新工艺。

According to the H NMRstudy, it was found that the protons on the cyclopentadienyl ring of 〓 were not splitted, but when one proton on the cyclopentadienylring was substituted by methyl, that is in〓 complexes, thefour protons on the ring were splitted into four groups,the 〓 between the onesignal and the others is large, the total splitting is over 2ppm. The splittings werealso affected by the halides linked with the titanium, they increase according to theorder of CI, Br, I. By the study of the 〓 Sn NMR, it is found that the chemicalshifts of 〓 are present in low field. It is assume that the large space strain causesthe angles of the tin linked with ligands deviate from the normal tetrahedral anglesresults low field shift for 〓Sn. And by MS study,there were no molecular ions for 〓 complexes in the spectra. However, for 〓 when X=CI,Br,NCO and Ar is tolyl or phenyl group,there were molecular ions,but theirabundances were very small,and no that for the iodide was found.

钛上的卤素对茂环氢的裂分也有影响，依〓，Br，I顺序，卤素对茂环氢的裂分依次加大；通过对〓的研究发现，以上这些化合物〓的化学位移都出现在低场，认为大的空间张力造成的锡的键角偏离正常的锡的四面体键角是造成〓化学位移出现在低场的原因；对这些化合物质谱的研究发现，〓系列化合物得不到分子离子峰，而〓系列的化合物，当X=〓，NCO和苯环上不带取代基或只带甲基时，则出现分子离子峰，但丰度很低，而相应的碘化物和其它化合物则没出现分子离子峰。

Some metals are found in their native status, that is, uncombined with other elements.

有些金属是以天然状态存在的，即不与其他元素化合。

Some metals, such as gold, are found in their native state---that is, uncombined with other dements.

有些金属，如黄金，是以天然状态存在的，即不与其他元素化合。

Sodium is never found uncombined in nature.

自然界中的钠被发现都处于化合状态。

It combines, with valence 2, 4, or 6, with nearly all other elements.

它能与几乎所有其它元素化合，原子价为2、4或6。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。