These on reduction with NaBH4 gave exclusively cis-3-heterocycle substituted chroman-4-ols in good yields.

【文摘】3,3-Dibromochroman-4-ones on reaction with different heterocyclic secondary amines gave 3-substituted chromones.

Reduction of azides is an important method to introduce amino group to organic molecules.

叠氮还原是向有机分子中引入氨基的重要方法。

The target compound was synthesized from N-benzyl protected aminoacetophenone through hydrogenation,benzoylation and reduction.

以氮-苄基保护胺基酮为原料，经氢化，甲酰化，还原三步合成双甲酰沙丁胺醇酯。

It is synthesized by oxidation of isocitrate, coupled to the reduction of NAD.

由异柠檬酸氧化而来，同时伴有NAD的还原。

The increase in indirect taxation is intended to neutralise the reduction in income tax.

增加间接税是为了抵消所得税的减少。

They are lobbying for a reduction in defence spending.

他们正在为减少国防开支而游说议员。

In this reaction,besides substitution products thiophenol etc,the reduction product benzene is formed.

反应中，除生成笨硫酚等取代外，还生成还原。

The proposed troop reductions were a useful bargaining counter in the disarmament talks.

裁减兵员的议是这次裁中一个有用的讨价还价的筹码。

A reduction in condensation is accomplished by the use of steam-jackets.

使用汽套就能达到降低冷凝。

METHODS Terazosin hydrochloride was synthesized from anhydro-piperazine via acylation,reduction,amination,salification etc.

方法以无水哌嗪为起始原料,经酰化、还原、胺化、成盐等反应制得盐酸特拉唑嗪。

You will have a reduction for cash.

付现金可以打折扣。

Cuprous chloride is an important inorganic fine chemical product,which was produced by nantokite reduction method.

[摘要] 氯化亚铜是一种重要的无机精细化工品。

To pay for the tax reductions, the government will put the bite on smokers and motorists.

为了弥补减税造成的损失，政府会将这笔账算在吸烟者和开车的人身上。

The effect of excess sludge reduction by uncoupler of 2,4-dechlorophenol(DCP) was studied using Sequencing Batch Reactor.

采用序批式活性污泥反应器试验研究了解偶联剂2,4-二氯酚(DCP)的污泥减量化效果。

The contribution of groyne height reduction to counteracting unwanted erosion is then considered a favourable incidental circumstance.

丁坝降低对减少一些对主槽不利的侵蚀是一项比较可取的措施。

I haven’t noticed any significant reduction in the performance of my car since switching to unleaded fuel.

用无铅汽油后，我发现汽车性能并没有明显降低。

The current preperation methods of strontinum carbonate from celesite are carbon reduction method and double decomposition method.

中国天青石资源十分丰富,但矿石品位低、杂质含量高,需经选矿除杂后才能作为生碳酸锶的原料。

Abstract:The structural influencing coefficient includes ductility reduction factor and overstrength factor.

［要］结构影响系数主要包括延性折减系数和超强系数。

Increased reaction time, smaller coal particle size and increased reburn fuel fraction lead to higher NO reduction rate.

所以,在使煤粉成为超细粉的基础上,利用低挥发分烟煤作为再燃燃料是具有可行性的。

The SOD of Rosa roxburghii tratt can inhibite the light reduction of NBT,autooxidation of epinephrine and autooxidation of phenenyl.

刺梨的SOD能抑制四氯唑兰(NBT)的光化还原、肾上腺素的自动氧化和邻三酚的自动氧化。