Abstract
The reaction of RuCl 2(PMe 3)( η 6-C 6Me 6) 1 with HCCCHOH(2-MeOC 6H 4) 2 and NaPF 6 in methanol led to the trans-alkenylcarbene complex [LnRu=C(OMe)CH=CH(2-MeOC 6H 4)]PF 6 3 (LnRu = Ru(Cl)(PMe 3)( η 6-C 6Me 6)) with the s-cis conformation of the carbene ligand. The activation by 1 of the racemic and of the (S,S) stereoisomer of the organometallic alcohol HCCCHOH( η 6-(2-MeC 6H 4)Cr(CO) 3 4 afforded the same two diastereoisomers [LnRu = C(OMe)CH = CH( η 6-(2-MeC 6H 4)Cr(CO) 3]PF 6 5 a b with low stereoselectivity in the ratio 55:45 (80%) and in the s-cis conformation. By contrast, the activation of HCCCOH(Me)( η 6-C 6H 5)Cr(CO) 3 8 by 1 led to two diastereoisomers [LnRu = C(OMe)CH=CMe( η 6-C 6H 5)Cr(CO) 3]PF 6 9 a b (64:34) with the s-trans conformation of the organometallic carbene ligand.
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