I+-abstraction versus I−-displacement in the reactions of diiodocethylene with metal carbonyl anions: X-ray structure of [(OC)5MneCCMn(CO)5]
作者:Julian A. Davies、Moneim El-Ghanam、A.Alan Pinkerton、Douglas A. Smith
DOI:10.1016/0022-328x(91)80023-d
日期:1991.6
diiodoacetylene, ICCI, reacts with THF solutions of the highly basic, third row, metal carbonyl anion, RE(CO)5−, exclusively by a formal I+-abstraction process producing ReI(CO)5 and Re2I2(CO)8. Under the same conditions, the less basic, first row, metal carbonyl anion, Mn(CO5− reacts to produce not only Mn2I2(CO8) by formal I+-abstraction but also (OC)5MnCCMn(CO5 by I−-displacement. These results may
固体diiodoacetylene,ICCI,用高碱性,第三行的THF溶液,金属羰基阴离子,RE(CO)反应5 - ,仅通过一个正式我+ -abstraction方法生产版本8(CO)5和R e 2我2(CO)8。在相同条件下,碱性较弱的,第一行中,金属羰基阴离子,锰(CO 5 -反应以产生不仅锰2我2(CO 8)由正规的我+ -abstraction而且(OC)5 MnCCMn( CO 5由I --移位。这些结果可以通过HSAB的论证和考虑分子轨道计算表明的基质中电荷分布来合理化。(OC)的X-射线结构5 MnCCMn(CO)5被报告。晶体为三斜晶,空间群P,在尺寸为a 6.421(2),b 6.425(2),c 9.520(2)Å,α81.86(2),β88.55(2),γ的晶胞中Z = 1 82.06(2)°,D计算为1.79 g cm -3。通过Patterson和Fouri