C_(14) ACETYLENES FROM ARTEMISIA FEDDEI~1

The phytochcmical investigation of the aerial parts of Artemisia feddei Levl. et Vant. gave a pair of novel C_(14) acetylenic spiroketals.     

La1-xPrxP5O14晶体的光谱性质

分析了室温下晶体在紫外、可见区的吸收，荧光和红外光谱，利用Judd-Ofeld理论计算了PrPP和La0.2Pr0.8PP晶体中Pr3 的实验振子强度，PrPP和La0.2Pr0.8PP晶体中Pr3 离子振子强度变化不大，说明在该晶体中Pr3 的浓度猝灭效应较小，红外光谱和结构分析确定了晶体的结构为单斜晶系，并观察到Pr^3 的3P0-3H6跃迁的红色发射很强。     

DL-苯丙氨酸-1-14C化学合成及酶促拆分

本文报道 DL-苯丙氨酸-1-(14)~C 的合成,并利用嗜热菌蛋白酶酶促拆分光学异构体。化学产率和放化产率一致,可达67%,标记化合物的放化纯度高于95%。     

Über die Synthese von Radio-4-dimethylaminoazobenzol aus 1-14C-Anilin

Zusammenfassung Für tierexperimentelle Untersuchungen wurde ein im Benzolkern durch¹⁴C markiertes p-Dimethylaminoazobenzol benötigt. Es wird ein Verfahren zur Herstellung dieser Verbindung in kleinen Mengen aus 1-¹⁴C-Anilin beschrieben.Herrn Prof. Dr.A. Franke zum 80. Geburtstag gewidmet.     

Synthesis of 14-Bromo and 14-Hydroxy Baccatin III Derviatives

Numerous efforts towards synthesis of anticancer drug paclitaxel (Taxol(r), 1a) with improved activities led to the modification at 13-phenylisoserine side chain and different positions of its core structure-baccatin III 1c1. At the same time, the activities of searching new taxoids for starting materials of new semi-synthetic paclitaxel analogs from Taxus spp. plant have not ever been stopped. Among these taxoids, 14?-hydroxy-10-deacetylbaccatin III 22 and 13-acetyl-9-dihydrobaccatin III …     

Chinese Journal of POLYMER SCIENCE VOLUME 14 NO. 1-4, 1996

CONTENTSPolymerization,10n1C,graft,block and ring openingStu勿on the Cationic Polymerization ofl,3一entadiene Initiated场AIC13/Alkyl HalideS”terns 尸丑万G物蕊。9, Llu几ali。,刀通IHa。。即邵dC‘N“承ng......................……(91)Iduenees of叭/a ter-soluble Catioule Monomers on the PolymerisationR石te in the Inverse Emulsion HOUS红‘a。叭d HAR佩加a ......................……,.....................……(183)Graft CoPolymerization of Vi叮1 Monomers onto Starehl址tiatedby升ansitio…     

Der Einbau vond-Glucose-1-14C in das Phenylpropangerüst des Fichtenlignins

Ohne Zusammenfassung     

化学研究第14卷第1期～第4期总目次

二氧化钛 /聚乙烯吡咯烷酮纳米复合薄膜的制备与表征张晟卯 ,吴红丽 ,张治军 ,等 ( 1-1)……………………………………三维网状结构聚金属氧酸盐K4SiW12 O4 0·16H2 O的合成及其X射线晶体结构分析党东宾 ,柏　艳 ,王敬平 ( 1-4)………………铒铁钴系复合氧化物的制备及其导电性王玉湘 ,王建英 ,张世珍 ( 1-8)…………………………………………………………Fe3O4 纳米颗粒的表面改性任欢鱼 ,庄　虹 ,刘勇健 ( 1-11)…………………………………………………………………………八钼酸根阴离子有机胺化合物的合成与结构韩秋霞 ,赵清岚 ,王敬…     

Structure and stability of the Al14 halides Al14In - (n=1-11): can we regard the Al14 core as an alkaline earthlike superatom?

We have studied the structures and stabilities of Al(14)I(n) (-) (n=1-11) clusters at the density functional level of theory. The experimentally observed Al(14)I(n) (-) (n=3, 5, 7, 9, and 11) [Bergeron et al., Science 307, 231 (2005)] are found to be stable both kinetically and thermodynamically. Al(14)I(3) (-), not Al(14)I(-), is the first member of the Al(14)I(n) (-) series in the mass spectrometric experiment, which is ascribable to the low kinetic stability of the Al(14)I(-) cluster. The Al(14) core in Al(14)I(3) (-) is close to neutral Al(14), both electronically and structurally. Population analysis shows that charge transfer occurs from the Al cluster to the I atoms, where the populations for Al(14) vary from -0.70(Al(14)I(-)) to +0.96(Al(14)I(11) (-)). The Al(14)I(5) (-) and Al(14)I(7) (-) clusters have the structure of Al(14)I(3) (-) as a core framework, but, for n=9 and 11, we found many more stable isomers than the isomers having the Al(14)I(3) (-) core. In particular, the shape of Al(14) in the Al(14)I(11) (-) cluster is a hexagonal wheel-shaped form, which was observed in the x-ray experiment for the metalloid complex [Al(14){N(SiMe(3))(2)}(6)I(6)Li(OEt(2))(2)](-)[Li(OEt(2))(4)](+)toluene [Kohnlein et al., Angew. Chem., Int. Ed. 39, 799 (2000)]. We have demonstrated that a simple jellium model cannot describe the structure and stability of the iodine-doped aluminum clusters, although it is successful for describing those of aluminum clusters. The electronic and geometric changes of the Al(14) (-) cluster due to the presence of iodines are very similar to the case of a magic cluster Al(13) (-). It can be concluded from our electronic and structural analysis that one cannot regard the Al(14) core as an alkaline earthlike superatom in the Al(14) iodide clusters.     

A convenient method for 14C-labeling of 2-methylthio-1-[4-N-α-ethoxycarbonylbenzyl)-amino-benzyl]-5-hydroxymethyl-2-[14C]-1H-imidazole and 1-[4-N-α-ethoxy-carbonylbenzyl)-aminobenzyl]-5-hydroxymethyl-2-[14C]-1H-imidazole as potential antihypertensives

The key synthetic intermediate, (2-mercapto-1-(4-nitrobenzyl)-1H-imidazol-5-yl)methanol-[2-¹⁴C], has been synthesized by using one pot procedure from potassium[¹⁴C]-thiocyanate. It was converted to two nonpeptide angiotensin II receptor antagonists, 2-methylthio-1-[4-N-α-ethoxycarbonyl benzyl)-aminobenzyl]-5-hydroxymethyl-1H-imidazole-[2-¹⁴C] and 1-[4-N-α-ethoxy-carbonylbenzyl)-aminobenzyl]-5-hydroxymethyl-1H-imidazole-[2-¹⁴C] via a 3-step sequence synthetic pathway.     

Synthesis of 14-epi-19-nor-22-oxa-1α,25-dihydroxyvitamin D3

The synthesis of 14-epi-19-nor-22-oxa-1α,25（OH）2D3 5 was started from diol 8 via Fall＇s method, oxidation, epimerization, protection, coupling with the 19-nor-A-ring 7, and then deprotection of the hydroxyl functions.     

Nd_2(Fe_(1-x)Co_x)_(14)B和Y_2(Fe_(1-x)Co_x)_(14)B的磁性

用磁测量和X-射线衍射研究了Nd_2(Fe_(1-x)Cox)_(14)B和Y_2(Fe_(1-x)Cox)_(14)B的晶格结构和内禀磁性。结果表明,低温下当钴含量较少时,Y_2(Fe_(1x)Cox)_(14)B的磁晶格向异性随钴含量的增加而增加,在1.5K和150K温度下,分别在x为0.4和0.2左右时磁晶各向异性常数达到极大;室温时的磁晶各向异性常数却随钴含量的增加而单调下降。用钴代换铁,对Nd_2(Fe_(1-x)Cox)_(14)B的自旋再取向温度的影响是复杂的。1.5K的饱和磁化强度在x=0.1左右达到极大。钴可以显著提高居里温度,对于Nd_2(Fe_(1-x)Cox)_(14)B和Y_2(Fe_(1-x)Cox)_(14)B,钴的作用几乎相同,表明居里温度主要由3d过渡金属原子之间的交换作用决定。     

Synthesis of 14-epi-19-nor-22-oxa-1α,25-dihydroxyvitamin D3

The synthesis of 14-epi-19-nor-22-oxa-1α,25(OH)2D3 5 was started from diol 8 via Fall's method, oxidation, epimerization, protection, coupling with the 19-nor-A-ring 7, and then deprotection of the hydroxyl functions.     

化学研究与应用2002年(第14卷)1-5期目录

评论与综述环肽研究新进展王　涛等　　 (3)— 1…………………………………………………………………………………………我国Ｓｃｈｉｆｆ碱稀土配合物的研究进展张秀英等　　 (9)— 1……………………………………………………………………核苷类抗病毒药物的研究进展李子成等　 (15 )— 1…………………………………………………………………………氧桥多核铁配合物的研究进展何　翔等　 (2 1)— 1…………………………………………………………………………聚合物纳米材料研究进展———Ⅰ .纳米聚合物夏和生等　 (2 7)— 1…………………     

14N16O的LMR光谱测量及其相关同位素分子14N17O和14N18O的光谱分析

采用内脏式ＣＯ激光磁共振（ＬＭＲ）技术测量了~(14)Ｎ~(16)Ｏ的Ｘ~Ｘ Ｚｅｅｍａｎ跃迁谱，并对其进行了标识、在Ｈｕｎｄ情形（ａ）双原子分子结构模型的基础上，采 用先进的同位素分子参数标度函数，对已发表的~(14)Ｎ~mＯ（ｍ＝ １６， １７， １８）光谱实验数据及 测量的 ＬＭＲ光谱数据进行了统一的分析计算，得到~14Ｎ~16Ｏ分子基态的精确结构参数， 其精度比前人的结果提高了 １－ ２个数量级，并由此推导出~(14)Ｎ~(17)Ｏ及~(14)Ｎ~(18)Ｏ等同位素分 子的结构参数．     

广东微量元素科学 2007年第14卷（第1～12期）总目次

第1期血清钙、镁和微量元素与冠心……………………………………………………………………………病刘荣(1)无机离子交换法从卤水中提锂的研究进……………………………………………展李丹邓天龙孙柏(6)真空浸渍技术在材料加工制备中的应………………………………………用万明汪灵张湘辉,等(11)过量Fe2 对水稻的毒害效……………………………………………………………………应邢承华蔡妙珍(17)竹炭对溶液中铬(Ⅳ)的吸附特性研………………………………………………………究王桂仙张启伟(23)成都市东郊(工业区)大气颗粒物及硫的分………………