
TY  - JOUR
A1  - Bruce, Michael I. 
A1  - Hall, Ben C. 
A1  - Skelton, Brian W. 
A1  - Tiekink, Edward R. T. 
A1  - White, Allan H. 
A1  - Zaitseva, Natasha N. 
T1  - Some Pentamethylcyclopentadienyl-Ruthenium Derivatives of Methyl Propiolate
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 2000
VL  - 53
IS  - 2
SP  - 99
EP  - 107
KW  - X-Ray crystallography; ruthenium; pentamethylcyclopentadiene.
UR  - https://doi.org/10.1071/CH99099 
N2  - The reaction between methyl propiolate and RuCl(PPh3)2Cp* and NH4PF6 in EtOH gives cationic vinylidene &#91;Ru&#123;=C=CH(CO2Me)&#125;(PPh3)2Cp*&#93; &#91;PF6&#93; (1), which is deprotonated to Ru(C&lowbar;CCO2Me)(PPh3)2Cp* by NaOMe. The alkynyl complex reacts with PhCH2Br to give &#91;Ru&#123;=C=C(CH2Ph)(CO2Me)&#125;(PPh3)2Cp*&#93; + , isolated as its bromide and PF6 &#8211; salts. In contrast, reactions between methyl propiolate and RuCl(PPh3)2Cp* in benzene afford neutral vinyl-idene RuCl&#123;=C=CH(CO2Me)&#125;(PPh3)Cp* (4) and metallacycle RuCl&#123;CH=C(CO2Me)CH=C(CO2Me)&#125;(PPh3)Cp* (5). The former complex is dehydrochlorinated by NaOMe in the presence of MeCN or P(OMe)3 to give Ru(C&lowbar;CCO2Me)(L)(PPh3)Cp* &#91;L = MeCN and P(OMe)3, respectively&#93;. A minor product (2%), obtained from treatment of (5) with NaOMe, is Ru&#123;CH=C(CO2Me)CH=C(CO2Me)C=CHC(O)OMe&#125;(CO)(PPh3)2 (8). X-Ray crystal structures of complexes (1), (4), (5) and (8) are reported. 
ER  -

