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@article{708380,
author = {Löbl, Jiří and Nečas, Marek and Pinkas, Jiří},
article_location = {UK},
article_number = {1},
keywords = {Alumazene; Single-crystal X-ray diffraction; Iminoalane; Triphenylphosphine oxide; Lewis acid-base adducts},
language = {eng},
issn = {1024-1221},
journal = {Main Group Chemistry},
title = {Alumazene adducts with triphenylphosphine oxide},
volume = {5},
year = {2006}
}
TY - JOUR
ID - 708380
AU - Löbl, Jiří - Nečas, Marek - Pinkas, Jiří
PY - 2006
TI - Alumazene adducts with triphenylphosphine oxide
JF - Main Group Chemistry
VL - 5
IS - 1
SP - 79 - 88
EP - 79 - 88
PB - Taylor & Francis
SN - 10241221
KW - Alumazene
KW - Single-crystal X-ray diffraction
KW - Iminoalane
KW - Triphenylphosphine oxide
KW - Lewis acid-base adducts
N2 - 1,3,5-trimethyl-2,4,6-tris(2,6-diisopropylphenyl)alumazene [2,6-(i-Pr)2C6H3NAlMe]3, (1) is a benzene-like iminoalane with a planar hexagonal (Al-N)3 core. The aluminum centers are highly Lewis acidic due to the low delocalization of nitrogen lone pairs. We examined the alumazene ability to form acid-base adducts with triphenylphosphine oxide. Both monoadduct, 1(OPPh3), (2) and bisadduct 1(OPPh3)2, (3) were prepared, isolated, and spectroscopically characterized. Their molecular structures were determined by the single-crystal X-ray diffraction method. The monoadduct 2 displays a boat conformation of the central ring with very short Al[sbnd]N bonds (1.779, 1.769(2) Å). The bisadduct 3 features the expected trans geometry in contrast to the previously reported bisadduct cis-1[OP(OMe)3]2. A different behavior of 2 and 3 in solution was observed by NMR spectroscopy. The monoadduct 2 is stable to dissociation while 3 shows signal broadening by chemical exchange because of the weakening of the second coordination Al[sbnd]O bond and/or internal rotation.
ER -
LÖBL, Jiří, Marek NEČAS and Jiří PINKAS. Alumazene adducts with triphenylphosphine oxide. \textit{Main Group Chemistry}. UK: Taylor \&{} Francis, 2006, vol.~5, No~1, p.~79 - 88. ISSN~1024-1221.
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