Alkynyl functionalized Al/P-based frustrated Lewis pairs – aluminium alkynide elimination and evidence for the formation of 3H-phosphaallenes [R-PCC(H)-<sup>t</sup>Bu]
phosphines (3 and 4) with aluminiumatoms in geminal positions to phosphorus. These compounds contain coordinatively unsaturated aluminium and phosphorusatoms and may be applicable as alkynyl functionalised frustrated Lewis pairs. Their unique constitution with dialkylaluminium and alkynyl groups in close proximity favours unusual secondary reactions with the elimination of an aluminium alkynide and formation
dialkynylphosphines的铝氢化,芳基-P(C C-吨丁基)2(芳基= 2,4,6-ME 3 c ^ 6 ħ 2(1)中,Ph(2)),与二烷基笨重氢化H-铝[CH (SiMe 3)2 ] 2提供混合的烯基-炔基膦(3和4)在铝的双原子位置上具有磷。这些化合物含有配位不饱和的铝和磷原子,可用作炔基官能化的受阻路易斯对。它们独特的结构与二烷基铝和炔基非常接近,有利于异常的二次反应,消除了炔基铝并形成了反应性3H-磷苯丙烯,芳基-P C C(H)-t Bu(5和6),具体取决于被芳基保护的位阻在室温下几天或几周内低聚。异氰酸酯衍生物5是在非常选择性的反应中形成的,但是相对不稳定的苯基化合物6仅在几种成分的混合物中检测到。这些(7)之一被分离为橙红色晶体,并被鉴定为具有中心AlC 2 P 2环的杂环两性离子化合物。其磷原子之一与末端炔基键合。
C≡C Triple Bond Activation by Heterocyclic Aluminum Phosphinides
作者:Hauke Westenberg、J. Chris Slootweg、Alexander Hepp、Jutta Kösters、Steffi Roters、Andreas W. Ehlers、Koop Lammertsma、Werner Uhl
DOI:10.1021/om901051p
日期:2010.3.22
reveal a P2C2Al ring with a tetracoordinated aluminum atom, two exocyclic C═C double bonds, a tricoordinated phosphorus atom, and a phosphonium cation carrying an aryl and an alkynyl group. The C≡C triple bond of 7 was inserted into the Al−P bonds of the heterocycles upon warming to give the bicyclic compound 13. A similar compound (12) was directly formed when the bisalkyne 4 was treated with dineopentylaluminum
芳基-二(治疗叔-butylethynyl)膦芳基P(C≡C-CME 3)2 [芳基= C 6 H ^ 5(4)2,4,6--ME 3 c ^ 6 ħ 2(5)]与氢化二烷基铝,R 2的Al-H(R = CME 3,CH 2 CME 3),得到的杂环,两性离子化合物6 - 9由铝氢化和相应的二聚的释放叔-butylethynyl-二烷基衍生物,[R 2的Al-C≡ C-CMe 3 ] 2(10和11)。的分子结构6 - 8揭示了在P 2 ç 2的Al环与四配铝原子,两个环外C = C双键,一个tricoordinated磷原子,和鏻阳离子携带芳基和炔基。升温后,将7的C≡C三键插入杂环的Al-P键中,得到双环化合物13。当将二炔4用氢化二戊基戊铝处理时,直接形成类似的化合物(12)。它们的分子结构显示出环状的四(AlC 2P)和五元杂环(P 2 C 3)包含三个不同的C═C双键。在空间上最受屏蔽的单环化合物(8;芳基=
Dimeric aluminum–phosphorus compounds as masked frustrated Lewis pairs for small molecule activation
作者:Steffi Roters、Christian Appelt、Hauke Westenberg、Alexander Hepp、J. Chris Slootweg、Koop Lammertsma、Werner Uhl
DOI:10.1039/c2dt30080j
日期:——
di(tert-butyl)aluminum hydride. Despite being dimeric, 2 behaves as a frustrated Lewispair and activates small molecules. The reaction with carbondioxide gave cis/trans isomeric AlPC2O heterocycles that differ only by the configuration of the exocyclic alkenyl unit. Four isomers resulted from the reaction with phenyl isocyanate. This is caused by cis/trans isomerization of the initial CO adduct and subsequent
芳基二炔基膦RP(C C– t Bu)2(R = Ph,Mes)与等摩尔量的氢化二乙基铝进行氢铝化,得到混合的烯基-炔基环状二聚体,其中铝-磷键与环外烯基成键。将三乙基铝添加到分离的1(R = Ph)或原位生成的物种(R = Mes)中会导致乙二乙炔乙炔的消除,从而生成芳基乙基磷二聚体2和3。它们具有与分子间的Al–P相互作用的椅子状Al 2 C 2 P 2杂环。船形(4)是通过t Bu–P(CC – t Bu)2与氢化二叔丁基铝反应得到的。尽管是二聚体,但2表现为沮丧的Lewis对,并激活小分子。与二氧化碳的反应产生了顺式/反式异构的AlPC 2 O杂环,其区别仅在于环外烯基单元的构型。与异氰酸苯酯的反应产生了四种异构体。这是由于最初的C O加合物的顺式/反式异构化以及随后重排为AlPC 2 N杂环(即CN加合物。
Electron rich acetylide clusters; molecular and electronic structure and reactions of Os<sub>3</sub>(CO)<sub>7</sub>(µ<sub>2</sub>-η<sup>2</sup>-CCR)<sub>2</sub>(µ-PPh<sub>2</sub>)<sub>2</sub>(R = Ph, Pr<sup>i</sup>); 50-electron species with expanded metal frameworks
作者:Andrew A. Cherkas、Nicholas J. Taylor、Arthur J. Carty
DOI:10.1039/c39900000385
日期:——
The reactivity of the 50-electron acetylide clusters Os3(CO)7(µ2-η2-CCR)2(µ-PPh2)2[(1a) R = Ph; (1b) R = Pri] which have unusual expanded Os3 frameworks, is dominated by nucleophilic addition at the metals: the molecular structures of Os3(CO)7(µ2-η2-CCPri)2(µ-PPh2)2 and the ethylamine adduct of (1a), Os3(CO)6(µ2-η2-CCPh)(η1-CCPh)(µ-PPh2)2(EtNH2)2(2a) have been determined by X-ray diffraction and their electronic structures probed by EHMO calculations.
具有异常扩展Os3框架的50电子乙炔簇Os3(CO)7(µ2-CCR)2(µ-PPh2)2[(1a) R = Ph; (1b) R = Pri]的反应性主要由金属上的亲核加成决定:Os3(CO)7(µ2-CCR)2(µ-PPh2)2和(1a)的乙胺加合物Os3(CO)6(µ2-CCR)(µ1-CCR)(µ-PPh2)2(EtNH2)2(2a)的分子结构已通过X射线衍射测定,其电子结构已通过EHMO计算探测。
Metallorganische Verbindungen des Kupfers VIII. Untersuchungen über die Koordinationschemie von heteroatomverbrückten Bisalkinen am Beispiel von Kupfer(I)-halogenid- und -trifluormethylsulfonat-Komplexen
The first organometallic coordination compounds of heteroatom-bridged bisalkynes are reported. Ten new copper(I) complexes of these ligands with halides and trifluoromethylsulphonate as anions were synthesized and characterized. The copper(I) halide complexes 4–9 were prepared by direct reaction of the copper(I) halides and the free ligands 1. The copper(I) trifluoromethylsulphonate complexes 10–13