Synthesis And Characterization of the First Homoaromatic Organometallic Carbene Complexes
Synthesis And Characterization of the First Homoaromatic Organometallic Carbene Complexes
Radcliffe, Marc Dudley
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= 3.22 Hz), 4.95 (dd, H7 1 , J ?1 8 , =11.02 Hz, J 6 , ?1 =3.22 Hz), 5.30 to 5.84 (complex, H2, H5, H6, H4, H3), 6.10 (dd, H8) , 6.29 (dd, H8'), 7.37(br s, 0's); 13 C nmr (CD 2 C1 2 )6 85.4 (d, Cp), 116.6 (d), 130 to 140 (0 and COT), 149.5 (s), 164.4 (dd, CI of COT), 222.3 (dd, CO). Mass spectrum m/e, 486 (M-CO), 383, 262 (100%), 224,121, 56. (n -Cycl opentadienyli ron[ bis (1,2-di phenyl phosphi no) ethane] )cyclooctate - traene (CpFe(DIPHOS)COT) (19) This compound could not be produced by the... methods discussed below. Photolysis of 100 mg FpCOT with 1.2 equivalents DIPHOS in d g -benzene was performed using all quartz glassware and a 550 W Hanovia Hg lamp. After 5 minutes, CO evolution was observed but the nmr spectrum of the solu- tion appeared unchanged. After 45 minutes of photolysis, several Cp re- sonances had replaced the original Cp signal at 4.5 ppm. Chromatography yielded only mixtures of unidentified products. Similar results were obtained when the above photolysis was carried out in THF using a pyrex filtered lamp.
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