Reactions of thioallenes with triiron dodecacarbonyl: a route to thioallyl-bridged diiron hexacarbonyl complexes
作者:Dietmar Seyferth、Lea L. Anderson、William B. Davis、Martin Cowie
DOI:10.1021/om00059a042
日期:1992.11
Thioallenes, RSC(X)=C=CH2 (R = CH3, C2H5, Ph; X = OCH3, H) react with Fe3(CO)12 to give products of type A. An additional product, B, is obtained when the thioallene used is PhSCH=C=CH2. A complex[GRAPHICS]of this type and the isomer in which the RS groups are in trans position also are obtained in low yield in the case of CH3SCH=C=CH2, in addition to the type B major product. The formation of (mu-RS)2Fe2(CO)6 as by-products indicates that some C-S bond cleavage occurs as well. The structures of one example each of structural types A and B have been determined: (eta1:eta3-CH38CHCCH2)Fe2(CO)6 (2a) for R = CH3, X = H; (eta3-PhSCHCCH2)2Fe2(CO)6 (15b) for R = Ph. Compound 2a crystallizes in the monoclinic space group P2(1)/c with a = 7.7134 (4) angstrom, b = 13.6321 (5) angstrom, c = 12.9757 (9) angstrom, beta = 102.318 (6)-degrees, V = 1333.0 (3) angstrom3, and Z = 4, and has refined to R = 0.041 and R(w) = 0.047 based on 2192 unique observations. Compound 15b crystallizes in the triclinic space group P1BAR with a = 10.938 (1) angstrom, b = 12.064 (2) angstrom, c = 9.806 (1) angstrom, alpha = 92.02 (1)-degrees, beta = 93.03 (1)-degrees; gamma = 68.15 (1)-degrees, V = 1199.2 (4) angstrom3, z = 2, and has refined to R = 0.038 and R(w) = 0.054 based on 3360 unique observations.