甲醛

Resorcinol-formaldehyde aerogel is made in a way similar to production of silica aerogel.

间苯二酚甲醛气凝胶是在一种类似生产白炭黑。

Indoor air pollution prevention;questionnaire survey;spot determine;formaldehyde

室内污染防治；问卷调查；现场检测；甲醛

A method for separation and analysis of salicylic aldehyde and phenol by capillary gas chromatography was developed.

采用毛细管气相色谱法对由苯酚和甲醛为原料合成的水杨醛及反应物苯酚进行了分离分析。

Its zinc complex was applied in asymmetric direct aldol reaction of acetone and p-nitrobenzal...

设计合成了一种NOBIN衍生的手性配体，初步研究了该手性配体的双核锌配合物在对硝基苯甲醛和丙酮的不对称直接醇醛缩合反应中的催化应用，20℃和20mol％催化剂量下，获得了32.5％ee和72％收率的产物。

The nucleophilic attack step of a classical Aldol reaction was studied using acetaldehyde anion and formaldehyde as reactants.

采用乙醛负离子和甲醛作为反应物，对经典的醛醇缩合反应中的亲核进攻步骤进行了研究。

We first examined the ability of the catalyst to promote the direct aldol reaction between acetone and 4-nitrobenzaldehyde under various conditions.

通过偶联反应将催化剂1固载到硅胶上，并将其用于催化环己酮和硝基苯甲醛的aldol反应，dr值最高达到90：10，ee最高76%。

We found that when acetone was used as solvent, in the presence of TFA, cis-4-pyrrodin-1-yl-L-proline could catalyze the direct asymmetric aldol reaction between acetone and 4-nitrobenzaldehyde with 84% ee.

研究发现，该催化剂以丙酮为溶剂时，加入催化剂等当量的三氟乙酸可以较好的催化丙酮与对硝基苯甲醛之间的直接不对称Aldol反应，得到84%的ee值。

It contains formaldehyde, aluminum hydroxide, and 2-phenoxyethanol, a toxic chemical comparable to antifreeze.

包含了甲醛，铝的氢氧化物，以及2-含苯氧基乙醇，一种可以与防冻剂类比的有毒化学物质。

Yao Liangsong thinks, at present ambry is in make, the contaminative problem in installing a process is more serious, formaldehyde exceeds mark, plank not the odour that environmental protection, paint sends out bring about air quality pollution to be underestimated greatly by consumer.

姚良松认为，目前橱柜在制作、安装过程中的污染问题是比较严重的，甲醛超标、板材不环保、油漆散发的气味等导致空气质量污染被消费者大大低估了。

Two: Synthesized a novel rhodamine derivative with a single amidogen, then analyzed and characterized the dye by 1H NMR and EI-MS.

二、以对硝基苯甲醛和八羟基久洛尼定为原料，合成了一种新型的罗丹明荧光染料，并通过核磁共振、质谱等手段对染料结构进行了表征。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。