Optically active triosmium cluster with bridging terpenic thioureato-like ligand – synthesis, structure, and absolute configuration

The reactions of (3bS,4aR)-3,4,4-trimethyl-3b,4,4a,5-tetrahydro-cyclopropa[3,4]cyclopenta[1,2-c]pyrazole-1-carbothioic acid (2-methoxy-phenyl)-amide (amide 1) containing a thiourea-like fragment >N–C(S)NHR with triosmium clusters Os3(CO)12−n(NCMe)n (n=1,2) and (μ-H)Os3(CO)10(μ-OH) result in the formation of diastereomers with the μ2 chelate-bridging by S and pyrazole N atom ligands. X-ray analysis of one of the diastereomers was performed and its absolute configuration was determined.