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• W1518767011 abstract "Reaction of the 14-electron cation `[Re(CO) 4 ] + ' [as (OC) 4 Re(OEt 2 )FBF 3 ] with 2-butyne yields the bis(alkyne) complex [(OC) 4 Re( η 2 -MeCCMe) 2 ] + BF 4 − ( 1 ), the first isolated cis -bis(alkyne) transition metal complex with a d 6 electron count. At ambient temperature and in the presence of O- or N-donors 1 isomerizes to the stable tetramethylcyclobutadiene complex [(OC) 4 Re( η 4 -C 4 Me 4 )] + BF 4 − ( 2 ), which forms a distorted trigonal bipyramid with a rectangular, cyclobutadiene ring in the equatorial position, and with remarkably different axial and equatorial Re–C–O bonds. Bonding, electronic structures and molecular geometries of 1 and 2 have been studied by means of Extended Huckel MO calculations. The isomerization reaction 1  →  2 is commented upon with respect to its mechanistic implications. A rhenacyclopentatriene intermediate is proposed, its electronic structure is described and its transformation to 2 is analyzed." @default.
• W1518767011 created "2016-06-24" @default.
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• W1518767011 date "1998-04-01" @default.
• W1518767011 modified "2023-10-18" @default.
• W1518767011 title "Metallorganische Lewis–Säuren, LVI" @default.
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• W1518767011 doi "https://doi.org/10.1016/s0022-328x(97)00718-3" @default.
• W1518767011 hasPublicationYear "1998" @default.
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