X-ray structure of hexamethyl benzenehexacarboxylate, [C 6 (COOCH 3 ) 6 ]

The thermal treatment of [Ru 2 (CO) 6 (μ-η 1 ,η 2 -C 4 H 3 O){μ-P(C 4 H 3 O) 2 }] 1 with dimethyl acetylenedicarboxylate (DMAD) at 110 °C leads to cyclotrimerization of DMAD. The cyclotrimerization product hexamethyl benzenehexacarboxylate, [C 6 (COOCH 3 ) 6 ] 2 , was obtained in 37% yield and characterized by a combination of spectroscopic data and single crystal X-ray diffraction study. Compound 2 crystallizes in the monoclinic space group P 1bar with a = 10.3002(12), b = 11.0371(13), c = 18.781(2) A, α = 76.148(2), β = 87.390(2), γ = 74.001(2)°, Z = 4 and V = 1992.2(4) A 3 . Key words: Cyclotrimerization; Dimethyl acetylenedicarboxylate; X-ray structure DOI: 10.3329/jbas.v34i2.6866 Journal of Bangladesh Academy of Sciences , Vol. 34, No. 2, 197-200, 2010