反应率

The effect of H2SO4 concentration and reaction time on the xylose yield and the selectivity of hemicellulose hydrolysis in corn stover under 121 ℃ was studied by response surface methodology.

通过响应曲面法，研究了反应温度为121℃时，不同硫酸浓度和反应时间对玉米秸秆中半纤维素水解为木糖的产率以及选择性系数的影响。

Treatment of 3-amino-4-chlorobenzoic acid with trimethoxymethane generated methyl 3-amino-4-chlorobenzoate in 80.0% yield.2-ethyl pivalate was oxidized by sulfuryl chloride,an...

所得中间体2-乙基特戊酸酯低温下经磺酰氯氧化，与中间体3-氨基-4-氯苯甲酸甲酯反应，所得产物经重排、水解和酰化反应得到目标化合物，总产率25.8%。

The thermodynamic calculation shows that it needs to consume 065 t of Na2CO3 in treating pseudoleucite syenite ore per ton, and about 95％ Na2CO3 could be recycled.

烧结反应实验结果表明，采用碳酸钠为助剂，假白榴正长岩粉体在760～880 ℃条件下反应10～15 h，矿石中主要矿物的分解率可达971％。

Rational reaction condition is that ratio of the Cu(superscript 2+) schiff base complex of disproportionated rosin amine is 3%, urushiol concentration is 68.8 g/L, the system of reaction reacts 36 h at 30℃ in alcohol dissolvent.

结果表明，氧化聚合反应的理想条件是以乙醇为溶剂，加入3%歧化松香胺席夫碱－铜配合物催化剂，漆酚浓度为0.0688g/ml，在30℃下反应36h后，漆酚聚合物的沉淀得率为51.3%。

It indicated that the vibratile radicle decreased and new radicle appeared. The activity was the most when treated by acid in pH＝1. The degradation rate was 62.96％, when treated with 98% H2SO4 and reacted for 2h.

酸处理的样品在pH＝1时催化活性最好，其中98%的H2SO4处理的样品2h的降解率达到62.96％，该降解反应为二氧化钛的光催化反应。

The effects of reaction conditions on molecular weight and yield of water-soluble chitosan were studied.

研究了反应条件对水溶性壳聚糖分子质量和产率的影响，结果表明，分子质量随着反应温度的升高而增大，随脱乙酰度的增加而减小。

The process of synthesizing wood flour polyether was studied further on the basis of previous process, and the synthesis conditions were optimized through both orthogonal experiment and one factor experiment.

在已开发的木粉聚醚合成工艺基础上进行了进一步的研究，通过加入合适反应介质和改变反应条件，将本粉液化率由原来最高的 6 5 %提高到 95 %以上，使所合成木粉聚醚的粘度完全满足了现有聚氨酯生产设备的要

N-substituted pyrroles are synthesized by reacting acetonylacetone with carbamic ester , catalysted by p-toluenyl sulfonic acid, heated at reflux temperature for 6h, collecting evolved water, giving to 75% yields, which is 26% more than the literature value.

以对甲苯磺酸为催化剂，用甲苯作溶剂，使2，5-己二酮与氨基甲酸酯在110℃反应6h，合成了5种氮取代吡咯衍生物，其中两种未见文献报道，反应产率均达到75％以上，比文献值高出了26％。

The allylation reactions of aldehydes with allyl bromide were carried out in 76%～93% yields with Nd-SnCl2-H2O under ultrasound irradiation at room temperature for 50～60 min.

在Nd-SnCl2-H2O体系中，用烯丙基溴超声诱发下进行了一系列芳香醛的烯丙基反应，室温反应50～60min得76%～93%烯丙基化产物；而不用超声波时同样体系中搅拌3～4h高烯丙基醇产率为30%～86%。

We make chloroacetylaion to N-terminal of Asp, and then convert this compound to GD dipeptide by aminolysis. Followed the lipase -catalyzed peptide synthesis of RGD in aqueous water-miscible organic cosolvent is studied. We set up a new efficient reaction method to synthesize RGD tripeptide. The problem that peptide containing polar amino acid can not be synthesized readily in organic solvent was solved. We offer a new experimental proof for PPL-catalyzed peptide synthesis and make a more general analysis for the effect of some factors in theory.

采用氯乙酰基保护天冬氨酸，然后进行氨解生成GD二肽，利用猪胰脂肪酶催化合成RGD三肽，着重解决了亲水氨基酸/肽片段底物的溶解性与合成产率低的问题，建立了一种新的有效合成RGD三肽的反应模型，并探索解决了极性较强的氨基酸的酶促肽合成的问题，对脂肪酶催化合成肽的影响因素从理论上作了较全面的分析，为肽片段的缩合反应提供了一种新思路。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！