羰基的

Silica gel column and reversed-phase C-18 column were employed to purify and separate monohydroxy intermediates.

此外，对DKR催化双羰基底物还原得到的3R，5S-双羟基产物进行纯化，再通过羟基保护和保护基的去除，以用于他汀类药物的手性侧链制备。

Then the cyclocarbonylation of propargylic alcohols under the catalysis of Pd 〓 with CuBr〓 and BQ was studied. Due to the high activity the yields of -α-bromoalkylidene-β-lactones were lower than that of -α-chloroalkylidene-β-lactones while the coupling reaction of -α-bromoalkylidene-β-1actones (i. e. Sonogashira and Suzuki coupling reaction) was quite smooth to afford the products in high yields.

接着我们研究了炔丙醇在Pd〓-CuBr〓-BQ催化体系下的羰基插入环化反应，由于-α-溴代亚烷基-β-内酯环化合物的活性高于-α-氯代亚烷基-β-内酯环化合物，导致反应收率偏低，而同样基于此原因，-α-溴代亚烷基-β-内酯环化合物的偶联反应进行得很顺利，而且收率很高。

Propionic acid is an important chemical raw materials, due to the lack of domestic technology, the paper is to study low, High activity of ethanol Oxo acid catalyst.

丙酸是一种重要的化工原料，由于国内技术的欠缺，本文旨在研究低要求、高活性的乙醇羰基合成丙酸催化剂。

This dissertation involves the syntheses, reactivities and structures ofGroup 6 metal carbonyl complexes containing the pyrazole ligands.

本论文开展了对含吡唑类配体的VIB金属羰基配合物的合成、反应及结构的研究，合成了70余个新化合物，并取得了如下研究成果。

The intramolecular proton transfers of phenol hydroxyl group to quinonoid carbonyl in Elsinochrome A are very sensitive for the change of molecular structure.

痂囊腔菌素A的酚羟基与醌羰基之间的分子内质子传递对其的结构变化最为敏感。7。

The carbonyl group tend to align in the direction of the electric field of the polarized laser, resultantly, the molecular chain were found to tend to align perpendicular to the electric field of the polarized laser, that is to say, the molecular chain inclined to align perpendicular to the direction of LIPSS.

聚酰亚胺分子中的羰基在偏振激光电场的作用下，沿电场方向取向排列，而使整个分子链沿垂直于电场的方向取向排列。

Although aqueous extract of Andrographis paniculata, aqueous extract of Mesona chinensis, ethanolic extract of Verbena officinalis at 1.25 μg/mL could only decrease TBARS formation, and ethanolic extract of Glossogyne tenuifolia, ethanolic extract of Mesona chinensis only decreased carbonyl formation at 1.25 μg/mL, ApW, McW, VoE, GtE and McE at 5 μg/mL appeared to have a lengthening in lag phase.

虽然，1.25 μg/mL 穿心莲水萃取物、仙草水萃取物、大陆马鞭草乙醇萃取物只能减少TBARS 的形成，而1.25 μg/mL香茹乙醇萃取物、仙草乙醇萃取物 McE）只能减少蛋白质羰基(carbonyl groups 的形成，但在5 μg/mL 的ApW、 McW、 VoE、 GtE 和McE 可明显延长迟滞期。

It showed that carbonyl FeNi(subscript 100-x) fibers with different chemical composition presented different structure. Carbon element in fibers existed in different forms.

结果发现：不同组份的羰基铁镍纤维，呈现不同的结构，且碳元素以不同形式存在，其形貌呈现直线型、&Y&型和&Z&形的特征。

Results show that palm oil and lard possess greater thermal stability than soybean oil, peroxide value, acid value and carbonyl value all show good correlation with frying time.

结果显示，与大豆色拉油相比，棕榈油和猪油有更高的煎炸稳定性；3种油的酸值、过氧化值、羰基值与煎炸时间存在着显著的相关性。

The infra red spectra of specimens show that there are evident changes of waves at the wavelength of 1743, 1660 and 1605cm-1 which are attributed to the change of C=O in wood. So it is clear that at least hemicellulose, even lignin in wood cell chemically changes during heat treatment of compressed wood of China fir.

红外吸收光谱表明，在热处理过程中波数在1743，1660和1605cm-1附近的羰基峰的变化趋势最为明显，说明在热处理固定杉木压缩木材的过程中，至少半纤维素，甚至木素发生了化学变化

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。