Two results argue against a diradical intermediate in the exchange of diosmacyclobutanes with free olefins. The diosmacyclobutane Os2(CO)8(mu-propene) reacts with vinylcyclopropane to give as the sole product a diosmacyclobutane bearing an intact cyclopropane ring. Repeated exchange of trans-ethylene-1,2-d2 with the same ligand in a diosmacyclobutane shows >99.1% stereochemical excess per exchange half-life. These exchange reactions do not involve mononuclear olefin complexes.
Structure of Tetracarbonylethyleneosmium: Ethylene Structure Changes upon Complex Formation
作者:Chandana Karunatilaka、Brandon S. Tackett、John Washington、Stephen G. Kukolich
DOI:10.1021/ja0727969
日期:2007.8.1
near-complete r0 gas-phase structure has been determined from a least-squares structural fit using eight adjustable structural parameters to fit the 21 measured rotational constants. Changes in the structure of ethylene on coordination to Os(CO)4 are large and well-determined. For the complex, the experimental ethylene C-C bond length is 1.432(5) A, which falls between the free ethylene value of 1.3391(13)
使用 Flygare-Balle 型脉冲束傅里叶变换微波光谱仪系统在 4-12 GHz 范围内测量了四羰基亚乙基锇的七种同位素 Os(CO)4(eta2-C2H4) 的旋转光谱。这种类型的烯烃 - 过渡金属配合物广泛出现在最近的有机合成中,并作为金属介导的烯烃转化中过渡态的重要模型。在天然丰度中观察到三种锇((192)Os、(190)Os 和(188)Os)和三种独特的13C 同位素异构体(13C 在乙烯、轴向和赤道位置)。对过氘化样品 Os(CO)4(eta2-C2D4) 测量了额外的光谱。测得的主要锇同位素 ((192)Os) 的旋转常数为 A = 929.3256(6)、B = 755.1707(3) 和 C = 752.7446(3) MHz,表明接近长轴不对称顶部分子。大约 140 个指定的 b 型转变使用 Watson S 约简哈密顿算子拟合,包括 A、B、C 和五个离心畸变常数。近乎完整的
Control of the photochemistry of Ru3(CO)12 and Os3(CO)12 by variation of the solvent
作者:Nicholas E Leadbeater
DOI:10.1016/s0022-328x(98)00704-9
日期:1999.1
photosubstitution of CO by two-electron donor ligands in M3(CO)12 [M=Ru, Os] has been investigated. When used as photolysis media, diethyl ether, ethyl acetate and acetonitrile act as photofragmentation quenchers allowing for the synthesis of photosubstitution products in high yield. UV photolysis of M3(CO)12 with added triphenylphosphine in these photolysis media leads to M3(CO)12−n(PPh3)n (n=1, 2
Lindner, Ekkehard; Kuehbauch, Hartwig; Mayer, Hermann A., Chemische Berichte, 1994, vol. 127, # 8, p. 1343 - 1348
作者:Lindner, Ekkehard、Kuehbauch, Hartwig、Mayer, Hermann A.
DOI:——
日期:——
Mononuclear hydrido alkyl carbonyl complexes of osmium and their polynuclear derivatives
作者:Willie J. Carter、John W. Kelland、Stanley J. Okrasinski、Keith E. Warner、Jack R. Norton
DOI:10.1021/ic00141a019
日期:1982.11
Wavelength-dependent primary photoprocesses of triosmium dodecacarbonyl in fluid solution and in rigid alkane glasses at low temperature: spectroscopic detection, characterization, and reactivity of coordinatively unsaturated triosmium undecacarbonyl