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20
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0032564554
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During this investigation, Myers and Goldberg have recently reported a novel transformation reaction of the twelve-membered tetrayne derivative into the corresponding bicyclo[7.3.0]dodecadienediyne: A. G. Myers and S. D. Goldberg, Tetrahedron Lett., 1998, 39, 9633.
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21
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For recent reviews on medium-sized cyclic diynes, see (a) R. Gleiter and R. Merger, in Cyclic Alkynes, Preparation and Properties in Modern Acetylene Chemistry, ed. P. J. Stang and F. Diederich, VCH, Weinheim, 1995, p. 285;
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30
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33645927119
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Numbering for NCS chromophore (1) was employed for convenience
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Numbering for NCS chromophore (1) was employed for convenience.
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31
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0027441445
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13C NMR spectrum. 20 A similar isomerization from the propargyl (prop-2-ynyl) ketone moiety to the corresponding allenyl ketone functionality was reported: (a) G. Majetich, Y. Zhang and G. Dreyer, Tetrahedron Lett., 1993, 34, 449;
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34
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(a) A. G. Myers, P. M. Harrington and E. Y. Kuo, J. Am. Chem. Soc., 1991, 113, 694;
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41
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33645933712
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note
-
Several attempts were made to develop a more convenient procedure involving fewer steps for obtaining 34. For example, the dialdehyde compound derived from 26 (e.g., compound 6 in Scheme 1) was reacted with dicerium acetylide or diiodoacetylene derivatives, prepared from 13, to afford an intractable mixture.
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-
-
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42
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33645907316
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note
-
Several preliminary attempts on conversion of 35 into the corresponding bicyclo[7.3.0]dodecadiyne derivatives were made under typical aldol conditions by using LDA or LHMDS. However, no ring closed compounds have so far been isolated from the reaction mixture.
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