摘要:
Nitrosamines, R2NNO, undergo homolytic cleavage of the N-N bond on reaction with iron carbonyls to give Fe(CO)2(NO)2 and organoiron products containing the ligands R2N, R2NCO, and R2NC, formally derived from amination of complexed carbon monoxide, together with amines and ureas. The major products from dimethyl- and diethylnitrosamine are (OC)4-Fe(mu-CNR2)Fe(CO)2NO (4). The ethyl derivative has been crystallographically characterized: space group Pbca, a = 13.573(5) angstrom, b = 14.675(2) angstrom, c = 16.313(2) angstrom, V = 3249.3 angstrom3, Z = 8, R(F) = 0.057, and R(w) = 0.061 for 1152 reflections with I greater-than-or-equal-to 2sigma(I). These nitrosyls are thermolyzed to the bridging carbyne complexes (OC)3Fe(mu-CNR2)2Fe(CO)3 (9) and trinuclear [(OC)3Fe]3-(mu3-CNR2)2 (21). Other products include (OC)3Fe[(mu-CNR2)(mu-OCNR2)]Fe(CO)3 (5), (OC)3Fe]3-[(mu-NR2)(mu-OCNR2)]Fe(CO)3 (6), and (OC)3Fe[(mu-NR2)(mu-CNR2)]Fe(CO)3 (8). Thermolysis of the carbene complex(Me2N)2CFe(CO)4 gives 5,8,9, and 21. The major product from N-methyl-N-nitrosoaniline and Fe2(CO)9 is the ortho-metalated ferracycle C6H4N(CH3)COFe(CO)4 (7), which has been crystallographically characterized: space group P2(1)/c, a = 6.396(1) angstrom, b = 10.056(2) angstrom, c = 19.025(3) angstrom, beta = 95.17(1)-degrees, V = 1218.7(1) angstrom3, Z = 4, RF = 0.032, and R(w) = 0.042 for 2008 reflections with I greater-than-or-equal-to 3sigma(I). This ferracycle, tetracarbonyl(1-methyl-3-ferra-2-oxindole), undergoes trimethylamine N-oxide induced alkyne insertion to yield 3,4-disubstituted (Et-, MeO2C-) 1-methyl-2-quinolones, while photochemically induced insertion of an alkyne gives a product where the 3,4-alkene bond has been reduced, together with the carbonylation product, N-methylisatin. One of two isomers Of (OC)3Fe[(mu-N(Me)Ph)(mu-OCN(Me)Ph)]Fe(CO)3 has been structurally characterized with psi-anti-Ph and psi-anti-Me groups: P2(1)/n, a = 19.919(7) angstrom, b = 10.122(4) angstrom, c = 22.548(9) angstrom, beta = 98.90(3)-degrees, V = 4491(3) angstrom3, Z = 8, R(F) = 0.045, and R(w) = 0.062 for 4648 reflections with I greater-than-or-equal-to 3sigma(I). Thionitrites, RSNO, react with Fe2(CO)9 to give Fe(CO)2(NO)2 and Roussin's red esters [(ON)2Fe(SR)]2, with Ni(CO)4 to give polymeric [RSNiNO]x, with Hg[CO(CO)4]2 to give CO(CO)3NO and unstable [CH3SCo(NO)2]2, with Mo-(CO)6 to give apolymeric product, with [C5H5Fe(CO)2]2 to give a mixture of [C5H5Fe(CO)SMe]2 and [MeSFe(NO)2]2, and with [C5H5Mo(CO)3]2 to give C5H5Mo(CO)2NO. [PhSNiNO]x reacts with C5H5Na to give C5H5NiNO, while NO reacts with [PhSNiC5H5]2 to give [PhSNiNO]x and C5H5NiNO. Fe(CO)2(NO)2 is synthesized by reacting ethyl nitrite with Fe2(CO)9 and from Fe(CO)4I2 and silver nitrite.