胆木新生物碱胆木碱己的结构测定

从胆木中分得新生物碱—胆木碱己。用紫外光谱,红外光谱,质谱及质子—质子二维核磁共振相关波谱法提出结构1,并由单晶X衍射确证。

内吸性杀菌剂三唑醇(酮)立体异构体的研究(Ⅱ)

确定了拆分三唑醇A、B两非对称异构体所形成的非对映中间体的结构,并得到100%光学纯的三唑醇右旋A体。经X-射线法等确定其绝对构型为(+)1R,2s,由Jones氧化反应得到100%光学纯的三唑酮右旋体,利用格氏氢转移反应对右旋三唑酮进行不对称还原得三唑醇的不同光学异构体。对小麦叶锈病的生物活性测定表明三唑醇中(-)-A-1S,2R的生物活性最高;三唑酮中,左右旋体的活性相当。

双(甲基环戊二烯基)二(2,6-二氯苯氧基)铪的晶体和分子结构

本文用X-射线衍射法测定了(η5CH9C5H4)5H1(OC6H9Cl3-2,6)2的晶体和分子结构.晶体结构属单科晶系,空间群为P21/c,晶胞参数为a=17.010(2)A,b=8.577(1)A,C=16.313(3)A,β=101.52(3)°,晶胞内分子数Z=4.分子内有非结晶学二次旋转轴对称性,铪原子周围的两个甲基环戊二烯基和两个氧原子构成一个变形四面体.两个环戊二烯基的平面夹角为125.33°.氧-铪-氧键角为103.71°.铪-氧键长为2.004—2.022A,较铪-氧单键键长为短,表明具有部分双键特性.

甲氧甲酰基三氯乙酰基亚甲基三苯基磷——Ylid-Ⅳ晶体结构研究

Ylid-IV(C_(22)H_(18)O_3PCl_3)的结晶属单斜晶系,空间群为(P2_1)/n,晶胞参数a=13.518(6)A,b=14.923(7)A,c=11.473(5)A,β=99.81(2)°z=4。用PW-1100四圆衍射仪收集衍射强度数据;用直接法(MULTAN-78)解结构;用全矩阵最小二乘方法修正结构,对2582个可观察反射(l>3σ(I))最终的R=0.074;差值Fourier综合确定了氢原子的坐标。

CRYSTAL STRUCTURE OF PHENYL 12-CROWN-4 NITRATE PRASEODYMIUM

The particular complex property of rare earth ion with crown enables it to have a wide application in separation and extraction of metal elements and organic catalysis, etc. The crowns with rare earth nitrate salts complex are: 15-crown-15, 18-crown-6, and 21-crown-7, etc. But up to now, there has been no report on studies of the complex crystal structure of this kind.

THE CRYSTAL AND MOLECULAR STRUCTURE OF PYRIDINE-TETRAKIS-(1,1,1-TRIFLUORO-3-2'-THENOYLACETONATO)-PRASEODYMIUM (Ⅲ)—Pr(TTA)_4·Py

The crystal structure of Pr （TTA）4·Py has been determined by X-ray differaction. Its molecular formula