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M\u00fchlst\u00e4dt, and K.-D. K\u00f6hler, Naturwiss., 1958, 336. (c) M. M\u00fchlst\u00e4dt, W. Treibs, and J. Mohr, Chem. Ber., 1961, 94, 808. (d) K. Hafner, H. Pelster, and J. Schneider, Liebigs Ann. Chem., 1961, 650, 62. (e) S. Takekuma, Z. Zhao, Y. Matsubara, D. Mkihara, H. Yamamoto, and T. Nozoe, Nippon Kagaku Kaishi, 1994, 399.","DOI":"10.1002\/cber.19560890119"},{"key":"10.3987\/COM-00-S(I)41-2","doi-asserted-by":"crossref","unstructured":"2. See, e.g., reaction of azulenes with benzaldehyde: (a) H. Franke and M. M\u00fchlst\u00e4dt, J. Prakt. Chem., 1967, 35, 262. (b) S. Ito, N. Morita, and T. Asao, Bull. Chem. Soc. Jpn., 1995, 68, 1409.","DOI":"10.1002\/prac.19670350505"},{"key":"10.3987\/COM-00-S(I)41-3","unstructured":"3. See, e.g., reaction of 2-methoxy- and 2-hydroxyazulenes with aldehydes: (a) S. Ito, N. Morita, and T. Asao, Tetrahedron Lett., 1988, 29, 2839. (b) Y. Matsubara, M. Morita, S. Takekuma, Z. Zhao, H. Yamamoto, and T. Nozoe, Bull. Chem. Soc. 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Chem., 1990, 62, 507.","DOI":"10.1351\/pac199062030507"},{"key":"10.3987\/COM-00-S(I)41-7","doi-asserted-by":"crossref","unstructured":"7. T. Nozoe, S. Seto, S. Matsumura, and Y. Murase, Bull. Chem. Soc. Jpn., 1962, 35, 1179.","DOI":"10.1246\/bcsj.35.1179"},{"key":"10.3987\/COM-00-S(I)41-8","unstructured":"8. T. Morita, Y. Takizawa, and K. Takase, presented at 15th meeting of non-benzenoid aromatic compounds, Kyoto, 1982, Abstr., p. 216."},{"key":"10.3987\/COM-00-S(I)41-9","unstructured":"9. The pKa values for 3a and 3b were determined in a similar manner as the determination of the pKR+ values for carbocations: (a) R. C. Kerber and H. M. Hsu, J. Am. Chem. Soc., 1973, 95, 3239. (b) K. Komatsu, K. Masumoto, Y. Waki, and K. Okamoto, Bull. Chem. Soc. Jpn., 1982, 55, 2470."},{"key":"10.3987\/COM-00-S(I)41-10","doi-asserted-by":"crossref","unstructured":"10. H. C. Brown and X. R. Mihm, J. Am. Chem. 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