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Kovač, Veronika; Rapić, Vladimir; Alagić, Jasmina; Barišić, Lidija (1999)
Publisher: Croatian Chemical Society
Journal: Croatica Chemica Acta
Languages: English
Types: Article
Subjects:
Reaction of equimolar amounts of methyl salicylate, sodium and N,N,N-trimethylferrocylammonium iodide (1a) in ethanol gave 55% of ethyl 1-ferrocenylethyl ether (4). By refluxing a solution of 9 mmol sodium and 3 mmol of FcCHRNMe3I (1a, R = H; 1b, R = Me; 1c, R = Ph) in a large excess of methyl salicylate for 2-3 hours, the corresponding methyl 5-ferrocylsalicylates (5) (10-23%) and methyl-3-ferrocylsalicylates (6) (12-20%) were obtained. During conversion of salt 1b, besides of 5b and 6b, 20% of vinylferrocene (7) and 6% of 1-ferrocenylethyl methyl ether (8) were isolated. Under the same conditions as in conversions 1 → 5, 6 2-ferrocenylethyl acetate (11) and methyl salicylate failed to react, and 2-ferrocenylethyl bromide (12) was transformed to 12% of methyl o-(2-ferrocenylethoxy)benzoate (13) and 25% of methyl 5-(2-ferroceny-lethyl)salicylate (14), as well as 10% of vinylferrocene (7). The mechanisms of reactions 1 → 5, 6 and 12 → 13, 14 are discussed, suggesting a stabilization effect by ferrocene nucleus in the intermediate α- and β-ferrocenyl carbocations.
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    • 1. Z. Zori}, V. Rapi}, S. Lisac, and M. Juki}, J. Polym. Sci., Part A: Polym. Chem. 37 (1999) 25-36.
    • 2. S. Lisac and V. Rapi}, J. Organomet. Chem. 507 (1996) 215-220.
    • 3. V. Kova~, V. Rapi}, I. Su{nik, and M. [uprina, J. Organomet. Chem. 530 (1997) 149-158.
    • 4. S. Lisac, V. Rapi}, Z. Zori}, and N. Filipovi}-Marini}, Croat. Chem. Acta 70 (1997) 1021-1037.
    • 5. N. F. Blom and E. W. Neuse, Transition Met. Chem. 12 (1987) 301-306.
    • 6. (a) S. T. Saengchantara and T. W. Wallace, Tetrahedron 45 (1990) 6553-6564; (b) W.G. Christiansen and S. E. Harris, U. S. pat 2.415.235; 4. 2. 1974; CA 41 (1947) P 2753 b; (c) J. B. Cohen and H. W. Dudley, J. Chem. Soc. 97 (1910) 1732-1745.
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