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Comparative Insertion Reactivity of CO, CO2, tBuCN, and tBuNC into Thorium– and Uranium–Phosphorus Bonds
Organometallics ( IF 2.5 ) Pub Date : 2020-05-27 , DOI: 10.1021/acs.organomet.0c00221
Michael L. Tarlton 1 , Iker Del Rosal 2 , Sean P. Vilanova 1 , Steven P. Kelley 1 , Laurent Maron 2 , Justin R. Walensky 1
Affiliation  

A study of the comparative reactivity of CO, CO2, tBuCN, and tBuNC with (C5Me5)2An[P(H)Mes]2 (An = Th, U) has been undertaken. While CO2 and tBuNC form identical products with both metals, namely (C5Me5)2An[κ2(O,O)-O2CPH(Mes)]2 and (C5Me5)2An[η2(tBuNC═PMes](CNtBu), respectively, differing results are obtained with CO and tBuCN. The reaction of tert-butylnitrile with (C5Me5)2U[P(H)Mes]2 in a 2:1 ratio leads to double insertion into the U–P bonds and elimination of H2PMes, forming the diketimido complex (C5Me5)2U[κ2(N,N)-(N═CtBu)2P(Mes)]. This is a case in which the analogous reaction with (C5Me5)2Th[P(H)Mes]2 affords a different product, (C5Me5)2Th[PH(Mes)][κ2(P,N)-N(H)C(CMe3)P(Mes)]. The reaction of 1 atm of CO with (C5Me5)2U[P(H)Mes]2 results in double insertion with proton migration from one phosphido ligand to one of the CO carbons to form (C5Me5)2U[(κ2(O,O)-OC═PMesC(O)(H)P(H)Mes]. This is in contrast to the previously published result of the reaction between (C5Me5)2Th[P(H)Mes]2 and CO, in which the product is similar, but both protons from the phosphido ligands migrate to one carbon atom, resulting in (C5Me5)2Th[κ2(O,O)-OC(H)2P(Mes)C(O)P(Mes)]. Density functional theory calculations demonstrate that the mechanisms are quite similar and therefore a similar product is formed, except uranium is less acidic, and the final C–H bond formation does not occur.

中文翻译:

CO,CO 2t BuCN和t BuNC插入Thor-铀-磷键中的比较插入反应性

进行了CO,CO 2t BuCN和t BuNC与(C 5 Me 52 An [P(H)Mes] 2(An = Th,U)的比较反应性的研究。而CO 2BuNC形成相同的产品与两种金属,即(C 552的[κ 2øö)-O 2 CPH(MES)] 2和(C 552的[η 2BuNC═PMes](CN丁基),分别不同的结果与CO和获得BuCN。的反应-butylnitrile与(C 552 U [P(H)的Mes] 2 1的比例导致重复插入成H的U-P键和消除:在一个2 2个机动设备中,形成diketimido复杂(C 552 U [κ 2ññ) - (N = C丁基)2 P(MES)]。在这种情况下,与(C 5 Me 52 Th [P(H)Mes] 2的类似反应得到不同的产物,(C 552的Th [PH(MES)] [κ 2PÑ)-N(H)C(CME 3)P(MES)]。1 atm的CO与(C 5 Me 52 U [P(H)Mes] 2的反应导致双插入,质子从一种磷酸配体迁移至一种CO碳,形成(C 5 Me 52 U [(κ 2øö)-OC═PMesC(O)(H)P(H)的Mes],这是相对于(C之间的反应的先前公布的结果552的Th [P(H)的Mes] 2和CO,其中,所述产品是类似的,但是从膦配位体两个质子迁移到一个碳原子,从而导致在(C 552的Th [κ 2øO)-OC(H)2 P(Mes)C(O)P(Mes)]。密度泛函理论计算表明,机理非常相似,因此形成了相似的产物,只是铀的酸性较低,并且最终的CH键不会形成。
更新日期:2020-05-27
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