COUPLING AND ANNELATION OF 2 ACETYLIDE GROUPS AND ALKYNE MOLECULES IN THE REACTION OF (OC)(5)REC=CPH WITH FERROCENYLACETYLENE - CRYSTAL AND MOLECULAR-STRUCTURE OF RE-2(CO)(7)(C(8)H(2)PH(2)(C5H4FEC5H5)(2))CENTER-DOT-ACETONE

X-Ray diffraction study was carried out of the binuclear complex Re-2(CO)(7)(C(8)H(2)Ph(2)Fc(2)) (II), obtained in the reaction of (OC)(5)ReC=CPh with ferrocenylacetylene FcC=CH in refluxing toluene. Complex II crystallizes in the monoclinic space group P2(1)/n with a 20.363(5), b 10.121(2), c 22.952(7) Angstrom P 112.49(2)degrees, V 4302(2) Angstrom(3), and Z = 4. Compound II possesses a rhenacyclopentadiene ring, fused with the methylenecyclopentene moiety along the central C-C bond, and pi-bonded by the Re(CO)(3) group. The hydrocarbon ligand of compound II is formed by condensation of two PhC=C groups and two FcC=CH molecules. Preparative methods of synthesis of (OC)(5)ReC=CPh, (OC)(5)ReC=CCO(2)Me and (OC)(5)ReC=CSiMe(3) are reported.