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Synthesis of Tetraborylethenes and 1,1,1′,1′-Tetra- and Hexaborylethanes; Electronic Interactions in Tetraborylethenes and 1,1,1′,1′-Tetraborylethanes, and HF-SCF Calculations

✍ Scribed by Martin Bluhm; Andreas Maderna; Hans Pritzkow; Sabine Bethke; Rolf Gleiter; Walter Siebert

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 414 KB
Volume: 1999
Category: Article
ISSN: 1434-1948
DOI: 10.1002/(sici)1099-0682(199910)1999:10<1693::aid-ejic1693>3.0.co;2-9

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✦ Synopsis

The catechol-substituted diboranes(4) 1 react with the tetraborylethane 4a, which has been studied by an X-ray structure analysis. Natural Bond Orbital (NBO) analyses for catechol-substituted diborylacetylenes 2, in the presence of [Pt(PPh 3 ) 2 (C 2 H 4 )] or [Pt(PPh 3 ) 4 ], to give tetra-and the RHF/3-21G optimized geometries of 4a and 5a reveal intramolecular stabilization of the boron p z orbital. This hexaborylethane derivatives. When [Pt(cod) 2 ] is used as catalyst, the tetraborylethene 5a is formed exclusively. covers B-O, B-B, and agostic interactions. The photoelectron spectrum of 5a is reported Catalytic hydrogenation of 5a affords the 1,1,1Ј,1Јthe corresponding diborylacetylenes 2, whereby access to

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