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Synthesis and Structural Aspects of N ‐Triflylphosphoramides and Their Calcium Salts—Highly Acidic and Effective Brønsted Acids
Author(s) -
Rueping Magnus,
Nachtsheim Boris J.,
Koenigs René M.,
Ieawsuwan Winai
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201001438
Subject(s) - catalysis , calcium , metal , chemistry , brønsted–lowry acid–base theory , spectroscopy , crystal structure , inorganic chemistry , organic chemistry , physics , quantum mechanics
Abstract Recently, 1,1′‐bi‐2‐naphthol (BINOL)‐based N ‐triflylphosphoramides emerged as a new class of potent Brønsted acid catalysts. In this paper we describe the efficient synthesis of various BINOL‐based N ‐triflylphosphoramides and their calcium salts. Furthermore, X‐ray crystal structure analysis combined with energy‐dispersive X‐ray spectroscopy (EDX) measurements confirmed that the synthesised chiral N ‐triflylphosphoramides are highly acidic metal‐free catalysts.