Synthesis and solid-state isomerisation reactions of diag- and lat-(η5-C5H4R)Re(CO)(L)X2
作者:Lin Cheng、Neil J. Coville
DOI:10.1016/s0022-328x(97)00700-6
日期:1998.4
or cis)(η5-C5H4R)Re(CO)2X2 (R=Me, t-Bu, SiMe3; X=Br, I) with isocyanides, phosphites and triphenyl phosphine proceeded rapidly at room temperature (r.t.) in the presence of Me3NO to give (η5-C5H4R)Re(CO)(L)X2 (L=CNC6H3Me2, P(OMe)3, P(OiPr)3, P(OPh)3, PPH3) in good yields (typically>75%) with the diagonal isomer as the dominant (>90%) product. The diag-(η5-C5H4R)Re(CO)(L)X2 isomer were readily converted
的反应DIAG -或LAT - (即反式或顺式)(η 5 -C 5 H ^ 4 R)的Re(CO)2 X 2(R = Me中,吨-Bu,森达3 ; X = Br的,I)与异氰化物,亚磷酸酯和三苯基膦在我的存在下迅速地在室温(rt)进行3 NO,得到(η 5 -C 5 H ^ 4 R)的Re(CO)(L)X 2(L = CNC 6 ħ 3我2,P(OMe)3,P(O iPr)3,P(OPh)3,PPH 3)的收率很高(通常> 75%),对角异构体为主要产品(> 90%)。的诊断- (η 5 -C 5 H ^ 4 R)的Re(CO)(L)X 2的异构体分别容易地通过直接加热固体转化成横向异构体在良好的产率(> 70%)诊断- (η 5 -C 5 H 4 R)Re(CO)(L)X 2在低于其熔点的氮气下。在CHCl 3或C 6 D 6中的溶液相异构化(rt,可见光照射)也从diag进行到LAt异构体。之间的固态反应DIAG(
Organometallic Chemistry: Structural Isomerization Reactions in Confined Environments
Reactions in the solution phase have dominated the development of chemistry. In recent years, however, the area of solid-state organic chemistry has undergone a renaissance, although the related area of organometallic chemistry is still in its infancy. Indeed, only a limited number of systematic studies on the reactions of organometallic compounds in a confined environment (on a surface, in a zeolite
Phase-Dependent Diagonal and Lateral Isomerism of the Rhenium Complexes (η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>Me)Re(CO)<sub>2</sub>Br<sub>2</sub>
作者:Lin Cheng、Neil J. Coville
DOI:10.1021/om950548s
日期:1996.1.23
The new diagonal and lateral monosubstituted cyclopentadienyl dibromodicarbonylrhenium complexes (eta(5)-C(5)H(4)R)Re(CO)(2)Br-2 (R = Me, Et, tBu, Si(CH3)(3), C6H11) have been synthesized and fully characterized by elemental analysis and IR and NMR spectroscopy. All the lateral complexes are completely converted to the corresponding diagonal isomers upon refluxing in toluene. Interestingly, diag-(eta(5)-C(5)H(4)Me)Re(CO)(2)Br-2 isomerizes to the corresponding lateral isomer in almost quantitative yield upon heating at 106-110 degrees C in the solid state. A DSC study of diag-(eta(5)-C(5)H(4)Me)Re(CO)(2)Br-2 shows that the solid state diag to lat isomerization proceeds exothermically. This is the first example of an organometallic complex that undergoes a phase-dependent reversible isomerization reaction under only thermal conditions.
Cheng, Lin; Coville, Neil J., Thermochimica Acta, 1998, vol. 319, # 1-2, p. 27 - 32