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Science 25 January 2002:
Vol. 295. no. 5555, pp. 660 - 663
DOI: 10.1126/science.1067157
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Reports

Isolation and Structural Characterization of 1-Zirconacyclopent-3-yne, Five-Membered Cyclic Alkynes

Noriyuki Suzuki,* Masayoshi Nishiura, Yasuo Wakatsuki

Stable five-membered cyclic alkynes were synthesized, isolated, and fully characterized. Divalent zirconium species, bis(cyclopentadienyl)zirconium(II) equivalent, reacted with (Z)-1,4-disubstituted 1,2,3-butatrienes [(Z)-R-CH=C=C=CH-R, 1a: R = (CH3)3Si-, 1b: R = tert-C4H9-] to give 1-zirconacyclopent-3-yne compounds (2a-b) in good yields. X-ray diffraction analysis revealed their five-membered cyclic structure with a sufficiently short triple bond to regard this compound as a metallacyclopentyne.

RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan.
*   To whom correspondence should be addressed. E-mail: nsuzuki{at}postman.riken.go.jp

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