Affiliation:
1. RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan.
Abstract
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 = (CH
3
)
3
Si-,
1b
: R =
tert
-C
4
H
9
-] 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.
Publisher
American Association for the Advancement of Science (AAAS)
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