Propargyl aldehyde complexes, (RC⋮CCHO)Co2(CO)6 (1a−c; R = Ph, Me, H), undergo
pinacol coupling with a variety of reductants, exclusively giving syn (dl)-diacetylenic diol
complexes 2a−c. The X-ray structures of 2a and 2c have been determined. The free diol
syn-PhC⋮C−CH(OH)CH(OH)−C⋮CPh (4a) is obtained efficiently from its cobalt complex
2a upon treatment with (NH4)2Ce(NO3)6.
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