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2,3,4‐Tricarba‐ nido ‐hexaboranes(7) with a Bridging B−Ethyl−B Moiety
Author(s) -
Wrackmeyer Bernd,
Schanz HansJörg,
Hofmann Matthias,
von R. Schleyer Paul
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199805)1998:5<633::aid-ejic633>3.0.co;2-d
Subject(s) - chemistry , moiety , bridging (networking) , stereochemistry , computer network , computer science
Hydroboration of diethyl(1‐propynyl)borane 1 with tetraethyldiborane(6) in the presence of a catalytic amount of trimethyl‐ or tributyltin chloride gave two new organo‐substituted carboranes 6 and 7 with 2,3,5‐tricarba‐ nido ‐hexaborane(7) and 2,3,4‐tricarba‐ nido ‐hexaborane(7) skeletons, respectively, along with polymeric material and the known organo‐substituted 1‐carba‐ arachno ‐pentaborane(10) ( 3 ) and pentaethyl‐1,5‐dicarba‐ closo ‐pentaborane(5) ( 4 ). Selective 11 B(5,6) decoupled 13 C‐NMR spectra indicate an unprecedented B(5)−ethyl−B(6) bridge in 7 . This structure is supported by the agreement between experimental and calculated 11 B‐ and 13 C‐chemical shifts on a model compound 7d with methyl groups in the 1,2,3,5,6‐positions and an ethyl group bridging B(5) and B(6).