94090-59-2

Upstream product

• 88271-76-5 Re₂(CO)8((CH₃)2PCH₂P(CH₃)2) 
• 536-74-3 phenylacetylene 

Relevant academic research and scientific papers

Reactions of Re2(CO)8 (L-L=dppm, dmpm) and Re2(CO)7(NCMe) with Alkynes

The photochemical reaction of Re2(CO)8 (L-L=dppm, dmpm) with terminal alkynes, RCCH (R=H, Ph), results in formation of (μ-H)Re2(CO)7(η1-CCRe2) (I), (μ-H)Re2(CO)6(μ-η1,η2-CCR) (II), Re2(CO)5(L-L)(μ-η1,η2-C(R)=CH2(μ-η1,η2-CCR) (III), and Re2(CO)6(μ-η1,η2-C(R)=CH2)(μ-η1,η2-CCR) (IV).The yield for each product depends on the reaction time and the bridging ligand.I is the first isolated example of bridging hydrido, ?-bonded alkynyl di- or polynuclear compounds directly formed from alkyne.In the reaction of II with acetylenes, coordination of dppm has been rearranged to form a chelate in III.The kinetic studies for the photochemical reactions of Re2(CO)8 and the isolated compounds I and II (L-L=dppm; R=Ph) with phenylacetylene indicate that the consecutive reactions occur with loss of one carbonyl ligand in each step: Re2(CO)8(μ-dppm)->I->II->III.The reaction of Re2(CO)8 with Me3NO in acetonitrile yields the acetonitrile-substituted complex Re2(CO)7(NCMe) (VI) wherein the acetonitrile ligand is located trans to phosphorus.The thermal reaction of VI with phenylacetylene at low temperature (40 deg C) yields I, in which the ?-bonded alkynyl ligand is cis to phosphorus.In the case of the reaction of Re2(CO)7(μ-dppm)(NCMe) with phenylacetylene, the isomer of I wherein ?-bonded alkynyl ligand is located trans to phosphorus is isolated as a minor product.I is transformed to II in a high-temperature thermal reaction reaction (110 deg C).The bridging alkynyl ligand of II undergoes a rapid fluxional process.The ΔGc value estimated from the coalescence temperature temperature in the 13C NMR spectra is 10.5 kcal/mol.The structures of (μ-H)Re2(CO)7(μ-dmpm)(η1-CCPh) (Id) and Re2(CO)5(dppm)(μ-η1,η2-CH=CH2)(μ-η1,η2-CCPh) (IIIc) were determined by conventional crystallographic techniques with Mo Kα X-rays.The crystals of Id belong to the monoclinic space group P21/c with a=12.594(1) Angstroem, b=11.075(1) Angstroem, c=18.461(3) Angstroem, β=105.88(1) deg, V=2476.8(9) Angstroem3, and z=4.The crystals of IIIc belong to the orthorhombic space group Pbca with a=12.743(2) Angstroem, b=15.974(2) Angstroem, c=35.174(4) Angstroem, V=7160(2) Angstroem3, and Z=8.