首页> 外文期刊>Organometallics >Syntheses, Structures, and Thermal Properties of Gyroscope-like Complexes Consisting of PtCl2 Rotators Encased in Macrocyclic Dibridgehead Diphosphines P((CH2)(n))(3)P with Extended Methylene Chains (n=20/22/30) and Isomers Thereof
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Syntheses, Structures, and Thermal Properties of Gyroscope-like Complexes Consisting of PtCl2 Rotators Encased in Macrocyclic Dibridgehead Diphosphines P((CH2)(n))(3)P with Extended Methylene Chains (n=20/22/30) and Isomers Thereof

机译:陀螺仪的合成,结构和热性质,其由包裹在大环二溴二膦((n))(3)p中包装的pTCl2旋转器组成,其中延长亚甲基链(n = 20 / 22/30)和异构体

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摘要

Reactions of P((CH2)(m)CH=CH2)(3) (2.0 equiv; m = 9 (f), 10 (g), 14 (k)) and PtCl2 in toluene give trans-PtCl2(P((CH2),CH=CH2)(3))(2) (trans-1f,g,k; 63-49%). Reactions of trans-lf,g with Grubbs first generation catalyst (CH2Cl2/reflux) followed by hydrogenations (cat. PtO2) afford chromatographically separable gyroscope-like trans-(GRAPHICS) (trans-2f,g, 3-19%; from interligand metathesis) and trans-(GRAPHICS) (trans-2'f,g, 25-12%; from inter and intraligand metathesis), where n = 2m + 2. Under analogous conditions, trans-1k gives only cis-(GRAPHICS) (cis-2k, 39%), but when o-C6H4CL2 solutions are kept at 180 C, trans-2k forms (quantitative by P-31 NMR; 72% isolated). In contrast, a similar sequence with the Hoveyda-Grubbs second generation catalyst gives only trans-2k (8%). The stability order cis trans is established for lg and 2'f,g in CH2Cl2 (61-56:39-44; months at RT), but the opposite is found for lg and 2'f in toluene (9-7:91-93) or 2'f in o-C6H4Cl2 (7:93). Thus, it is proposed that the conversion of trans-lk to cis-2k involves a geometrical isomerization of the educt or an intermediate catalyzed by a species derived from Grubbs catalyst. The crystal structures of trans-2gTHF and cis-2'f,g are determined and analyzed in detail.
机译:P((CH 2)(M)CH = CH 2)(3)(2.0当量; M = 9(F),10(g),14(k))和PTCl 2在甲苯中给予反式PTCl2(P(( CH2),CH = CH2)(3))(2)(Trans-1F,G,K; 63-49%)。 Trans-LF,G与Grubbs第一代催化剂(CH 2 Cl 2 /回流)的反应,然后是氢化(猫。PTO 2)提供色谱分离的陀螺仪样转蛋白(图形)(Trans-2F,G,3-19%;来自非间隔复分解)和转型(图形)(Trans-2'F,G,25-12%;来自间和intraligand复分解),其中n = 2m + 2。在类似条件下,Trans-1K仅提供CIS-(图形) (CIS-2K,39%),但是当O-C6H4Cl2溶液保持在180℃,Trans-2K形式(通过P-31 NMR定量定量; 72%分离)。相反,具有Hoveyda-Grubbs第二代催化剂的类似序列仅给予Trans-2k(8%)。稳定顺序CIS&在CH 2 Cl 2(61-56:39-44中的Lg和2'F中,在CH 2 Cl 2中建立Trant,但在甲苯中为LG和2'F(9-7:91-93)或2'f在O-C6H4CL2(7:93)中。因此,提出了反式LK的顺-2K的转换涉及的离析物的几何异构化或中间由Grubbs催化剂衍生的物种催化。确定和分析反式2gthf和CIS-2'F,G的晶体结构。

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