ChemicalBook CAS DataBase List 13,15-octacosadiyne

13,15-octacosadiyne synthesis

3synthesis methods

Product Name:13,15-octacosadiyne
CAS Number:24643-46-7
Molecular formula:C28H50
Molecular Weight:386.7

765-10-6
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Yield:24643-46-7 65 %Chromat.

Reaction Conditions:

with Au/C;oxygen at 170; for 18 h;

Steps:

2.2.2 Initial rate measurements

General procedure: Initial rates were calculated from the slope of the first-order kinetic curves of the homocoupling of ortho-tolylacetylene under different pressures of oxygen or at different concentrations of alkyne. The points of the kinetic curves were obtained from independent batch experiments by stopping the reaction at different reaction times. For that, the solid catalyst (Au/C or Au/CeO₂: 41mg, Au/ZnO: 65mg; 2mol% Au) was placed in a thick double-walled 2.5-ml glass reactor equipped with a magnetic stirrer. Then, 1,3-dichlorobenzene (0.5ml) and the corresponding amount of ortho-tolylacetylene were added and the vial capped with the pressure system. Neat molecular oxygen gas was loaded through a needle until the manometer indicated the corresponding pressure. Then, the reactor was magnetically stirred in a pre-heated oil bath at 170°C for the desired time. After this time, the reactor was cooled with water and the gas released. Diethyl ether (1ml) was added and the whole mixture was filtered and submitted to GC and GC-MS analysis after dodecane (22μl, 0.1mmol) was added as an external standard. The yield of homocoupling of ortho-tolylacetylene was plotted versus time and the slope at low yields gives the initial rate in h^-1.

References:

Boronat, Mercedes;Laursen, Siris;Leyva-Perez, Antonio;Oliver-Meseguer, Judit;Combita, Diego;Corma, Avelino [Journal of Catalysis,2014,vol. 315,p. 6 - 14]