Spontaneous dehydrocoupling in peri-substituted phosphine–borane adducts
作者:Laurence J. Taylor、Brian A. Surgenor、Piotr Wawrzyniak、Matthew J. Ray、David B. Cordes、Alexandra M. Z. Slawin、Petr Kilian
DOI:10.1039/c5dt02539g
日期:——
Borane adducts of peri-substituted bis(phosphines) eliminate hydrogen at room temperature, without the presence of catalysts. These reactions are the first examples of “spontaneous” phosphine–borane dehydrocoupling.
General and Stereoselective Method for the Synthesis of Sterically Congested and Structurally Diverse <i>P</i>-Stereogenic Secondary Phosphine Oxides
作者:Zhengxu S. Han、Hao Wu、Yibo Xu、Yongda Zhang、Bo Qu、Zhibin Li、Donald R. Caldwell、Keith R. Fandrick、Li Zhang、Frank Roschangar、Jinhua J. Song、Chris H. Senanayake
DOI:10.1021/acs.orglett.7b00568
日期:2017.4.7
A general and efficient method for the synthesis of bulky and structurally diverse P-stereogenic chiral secondary phosphine oxides (SPOs) by using readily available chiral amino alcohol templates is described. These chiral SPOs could be used as chiral building blocks for the synthesis of difficult-to-access bulky P-stereogenic phosphine compounds or ligands for organic catalysis.
(Electrochemical) Properties and Computational Investigations of Ferrocenyl-substituted Fe<sub>3</sub>(μ<sub>3</sub>-PFc)<sub>2</sub>(CO)<sub>9</sub> and Co<sub>4</sub>(μ<sub>4</sub>-PFc)<sub>2</sub>(CO)<sub>9</sub> Clusters and Their Reduced Species
作者:Marcus Korb、Xianming Liu、Sebastian Walz、Marco Rosenkranz、Evgenia Dmitrieva、Alexey A. Popov、Heinrich Lang
DOI:10.1021/acs.inorgchem.0c00276
日期:2020.5.4
ferrocenyl-functionalized iron and cobalt carbonyl clusters is reported, based on a reaction of FcPCl2 (3) (Fc = Fe(η5-C5H5)(η5-C5H4)) with Fe2(CO)9 and Co2(CO)8, respectively. Therein, nido-Fe3(CO)9(μ3-PFc)2 (4) and nido-Co4(CO)10(μ3-PFc)2 (5) clusters were obtained as the first diferrocenyl-substituted carbonyl clusters with a symmetrical cluster core. Cluster4 shows two reversible one-electron processes
根据FcPCl2(3)(Fc = Fe(η5-C5H5)(η5-C5H4))与Fe2(CO)9和Co2(CO)8的反应,报告了二茂铁基官能化的铁和钴羰基簇的形成。 , 分别。其中,获得了nido-Fe3(CO)9(μ3-PFc)2(4)和nido-Co4(CO)10(μ3-PFc)2(5)簇,这是第一个具有对称簇的二茂铁基取代的羰基簇核心。簇4显示了基于Fc / Fc +氧化还原事件的阳极区域内的两个可逆单电子过程,以及阴极区域的两个过程。所有电子状态的原位IR和电子顺磁共振(EPR)测量证实了基于Fc的氧化和基于核的还原。根据对4和5的结构进行单晶X射线分析的结果 对最高占据分子轨道-最低未占据分子轨道能量,自旋密度,原子-分子离域指数的量子理论和原子电荷进行了计算研究,以解释实验结果。后者揭示了还原后簇核的重组以及在4和5中存在弱的P···P相互作用。由于分布不同,在4的情况下可逆发生的二茂铁基相关的氧化还原过程不存在。
rotational barrier of the methylene bonds is extraordinary low. Therefore, in contrast to other bis(methylene)phosphoranes, the endo- and exo-Tms groups are indistinguishable on the NMR time scale even at −100°C. The analogous ferrocenylbis(imino)phosphorane Fc-P(=NTms)2 (9), can only be isolated in its dimeric form. The conditions, which are necessary for the formation of (9) from the corresponding
Structural Variety of Iron Carbonyl Clusters Featuring Ferrocenylphosphines
作者:Marcus Korb、Xianming Liu、Sebastian Walz、Julia Mahrholdt、Alexey A. Popov、Heinrich Lang
DOI:10.1002/ejic.202100097
日期:2021.6.7
of Fe2(CO)9 (10) with ferrocenenyl dichlorophosphines of different substitution is discussed. Single FcPCl2, (5) as well as 1,1’‐ (6) and 1,2‐ (9) difunctionalized phosphines were used, of which 6 and 9, were prepared in a novel straightforward synthetic process. Substrate 5 gave butterfly‐shaped Fe2(CO)6(μ2‐Cl)(μ2‐PFcCl) and Fe2(CO)6(μ2‐PFcR1)(μ2‐PFcR2) (R1, R2=Cl, H). In addition, nido‐Fe3(CO)10(μ3‐PFc)