Abstract
A successful synthesis of Cp*Ru(η5-CH2CHCHCHO) (1) was obtained by chromatography on neutral deactivated alumina of Cp*Ru(1−4-η-CH2CHCHCHOSiMe3)Cl (2). The disproportionation reaction of 2 affords compounds 1 and Cp*Ru(1−3-η-endo-syn-CH2CHCHCHO)Cl2 (3). Reaction of compound 1 with diphenylacetylene affords compounds Cp*Ru[1−5-η-syn-CH(Ph)C(Ph)CHCHCH(CHO)] (6), Cp*Ru[1,4,5-η-C(Ph)C(Ph)CH2CHCH2]CO (7), Cp*Ru(1−3-η-CH2CHCHCHO)(η2-PhC⋮CPh) (8), and compounds with cyclic structures, such as Cp*Ru[1,6,7,10,11-η-CH(CH)4CCHC(Ph)CH(CH)2C(O)CH(C6H4)CH(Ph)] (9) and Cp*Ru[3,4,5-η-C(Ph)C(Ph)CHCHCHC(O)](η2-PhCHCHPh) (10). Reaction of compound 3 with diphenylacetylene shows the syn-aldehyde derivative 6, as well as the corresponding kinetic isomer 11, in which the terminal aldehyde group is in anti-position. Treatment of [Cp*RuCl2]2 with CH2CHCHCHOSiMe3 affords compound Cp*Ru[1−3-η-endo-syn-(Me)CHCHCH(OEt)]Cl2 (5). The Ru(IV) complex 5 reacts with diphenylacetylene to give the cyclic 1,2-diphenyl-3-methylcyclopentadieny...
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