羰基的

It was found that the carbonyl group in 3-position of the 1-alkynes is important for the enantioselectivity of the reaction.

通过研究发现，只有炔基与羰基相连时，反应的对映选择性才会比较高。

This is exactly opposite to the order of E465/E665 in HA and the order ofΔ~ K. It shows that the larger the extent of humification, the larger the effect for reducing the rate of Phoxim hydrolysis, because the extent of HA humification is closely related to the extent of benzene in HA and the amount of carbonyl, aryl, phenolic hydroxide.

因腐殖酸腐殖化程度与腐殖酸芳构化程度、羧基、羰基和酚羟基的含量等相关，因此用腐殖酸腐殖化程度反映腐殖酸对农药水解作用大小比仅用腐殖酸中有机碳含量等因素反映更为合理。

Among the variousα-oxo ketene dithioacetals,α-alkenoyl ketene dithioacetals are easier to prepare and bear much more functionalities.

在众多的α-羰基二硫缩烯酮类化合物中，α-烯酰基二硫缩烯酮具有易于制备，官能团多等特点。

Among the existing means to construct these synthetically and biologically important molecules, metal-mediated allylation and propargylation is one of the easiest and most convenient.

在现存的用来构建这些重要的合成子和生物分子的方法中，金属促进的羰基化合物烯丙基化和炔丙基化是最容易和最方便的。

Zn/Cd〓-mediated carbonyl allylation and benzylation could smoothly proceed in distilled and tap water.

以纯水作为反应介质，以Zn／Cd〓作为反应促进剂，实现了羰基化合物的苄基化。

In all those complexes, no matter which conformation IDA assumes (mer- or fac-style), the two 0 atoms of 1N2O are both from carboxylic hydroxyl. However, by comparing the bond length, we can find that O(4) and O(2) atom is from different group in this complex, 0(4) atom from carboxylic hydroxyl, whereas, 0(2) from carboxylic carboxide.

值得注意的是：在这个双核配合物中，我们首次发现一种新颖的配位方式：IDA上与金属离子配位的三齿螯合原子是亚氨N原子、一个羧基上的羟基O原子和另外一个羧基上的羰基O原子。

Moreover, Oxygen-containing groups such as methoxyl, carbohydrates, carboxylic/carbonyl, were also very different among four HAs

另外不同腐殖酸之间，含氧结构单元如甲氧基、碳水化合物结构、羧酸/羰基官能团等的含量也明显不同。

In the last part we first synthesized the propargylic amines though several methods and then developed a new methodology for the synthesis of -α-chloroalkylidene-β-lactams via the catalysis of PdCl〓 with CuCl〓 and BQ with moderate to good yields and good generality.

论文的第三部分工作是我们首先通过几种方法合成了炔丙基胺化合物，接着对PdCl〓催化的炔丙基胺的羰基插入环化反应进行了研究，以中等收率得到-α-氯代亚烷基-β-内酰胺化合物，反应的普适性良好。

Aging mechanism of wood-plastic composite was: light and heat break down the long molecular chains of wood flour and plastic; the free radicals reacted with the oxygen, which generated carbonyl groups, hydroperoxides and so on; the free radicals also had cross linking reaction, which generated alkoxy; Water destroyed the interface of wood flour and plastic, hydrolyzed ester additives, extracted the small molecule additives and degradation products; Microorganism degraded cellulose, semicellulose, lignin and ester additives; degradation product from different component accelerated the aging, which could be exampled by the fact that HCl from degradation of PVC accelerated the hydrolyzation of cellulose and semicellulose.

木塑复合材料的老化机理为：光和热引发木塑复合材料中木质组分和塑料组分大分子链断裂，产生的自由基与氧气作用，发生链支化反应生成羰基、氢过氧化物等，发生交联反应生成烷氧基等；水分破坏木-塑界面、水解酯类添加剂、抽提小分子添加剂和降解产物；微生物分解纤维素、半纤维素、木素和酯类添加剂；木塑复合材料中各组分的降解产物相互促进老化，PVC降解产生的HCl溶于水，促进了纤维素和半纤维素的水解。

Bromo-5-formyl -3-methylpyrrole is an important intermediate of tolyporohin. On the base of introducing the present research and development of tolypo- rohin and pyrroles ramification at home and abroad, an emphasis was made on synthesis of 2-Bromo-5-formyl -3-methylpyrrole and the technical conditions of all steps, which was described as follows. Diethyl 3,5-dimethylpyrrole-2,4-dicarboxylate was made by nitrification, reduction and cycle of ethyl acetoacetate.

由于2-溴-5-甲酰基-3-甲基吡咯是合成托尼卟吩的重要中间体，本文在阐述了当前托尼卟吩及吡咯衍生物的国内外研究和开发的基础上，重点研究了2-溴-5-甲酰基-3-甲基吡咯的合成，并对各步反应进行了工艺研究，具体合成步骤如下：本文通过对乙酰乙酸乙酯的亚硝化、还原、成环，反应生成吡咯单环衍生物2，4-二乙氧羰基-3，5-二甲基吡咯。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。