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Inside Cover: Direct Evidence for a [4+2] Cycloaddition Mechanism of Alkynes to Tantallacyclopentadiene on Dinuclear Tantalum Complexes as a Model of Alkyne Cyclotrimerization (Chem. Eur. J. 32/2015)
Author(s) -
Yamamoto Keishi,
Tsurugi Hayato,
Mashima Kazushi
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201590143
Subject(s) - cycloaddition , tantalum , alkyne , intermolecular force , ring (chemistry) , chemistry , cover (algebra) , ligand (biochemistry) , stereochemistry , molecule , organic chemistry , catalysis , receptor , mechanical engineering , biochemistry , engineering
A dinuclear tantalum metallacyclopentadiene complex reacts with 2‐butyne to form a dinuclear tantalum complex bearing a dianionic C 6 Et 4 Me 2 ligand through the intermolecular [4+2] cycloaddition pathway. The picture uses scuba diving to illustrate the transition state of the [4+2] cycloaddition reaction. Six divers symbolize the ring‐constructing carbon atoms and are forming a circle hand in hand as they are gathering around two turtles. For more details see the Full Paper by H. Tsurugi, K. Mashima, and co‐workers on page 11369 ff.