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Hexadentate Poly‐Lewis Acids Based on 1,3,5‐Trisilacyclohexane
Author(s) -
Schäfer Fabian,
Neumann Beate,
Stammler HansGeorg,
Mitzel Norbert W.
Publication year - 2021
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/ejic.202100437
Subject(s) - chemistry , lewis acids and bases , hydrosilylation , trifluoromethanesulfonate , adduct , silylation , hydroboration , polymer chemistry , boron , medicinal chemistry , boranes , tin , stereochemistry , catalysis , organic chemistry
We report the preparation of hexadentate poly‐Lewis acids (PLA) based on 1,3,5‐trisilacyclohexane backbones bearing two alkynyl groups attached to each of the silicon atoms. A rigid hexadentate PLA bearing six Lewis‐acidic catecholatoboryl‐substituents was prepared by a tin‐boron exchange reaction. Its structure, determined by X‐ray diffraction, is the first of a Lewis‐acid‐functionalised donor‐free trisilacyclohexane. Flexible hexadentate PLA were prepared by hydroboration or hydrosilylation of hexavinyltrisilacyclohexane, resulting in PLA with six 9‐BBN, SiCl 3 , SiCl 2 Me or SiClMe 2 groups. The Lewis‐acidity of the last one was increased by conversion with silver triflate, resulting in a PLA with six highly acidic silyl triflate groups attached to the 1,3,5‐trisilacyclohexane unit as TfOSiMe 2 ‐C 2 H 4 ‐ groups. Host‐guest experiments of the above PLA demonstrated the suitability of the flexible representatives for complexation of neutral Lewis‐based guest molecules under formation of 1 : 6 adducts (host: guest).