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Structural assignment of a molybdenum‐containing silsesquioxane which catalyzes the metathesis of olefins: DPFGSE‐NOE and x‐ray diffraction studies
Author(s) -
Feher Frank J.,
Hwang TsangLin,
Schwab Joseph J.,
Shaka A. J.,
Ziller Joseph W.
Publication year - 1997
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199711)35:11<730::aid-omr162>3.0.co;2-h
Subject(s) - chemistry , molybdenum , silsesquioxane , metathesis , salt metathesis reaction , crystallography , diffraction , x ray crystallography , stereochemistry , organic chemistry , polymerization , physics , optics , polymer
The reaction of [( c ‐C 6 H 11 ) 7 Si 7 O 9 (OSiMe 3 )(OTl) 2 ] with [Mo(CHCMe 2 Ph)(NAr)(OSO 2 CF 3 ) 2 (dme)] (Ar=2,6‐diisopropylphenyl) affords 4a as the predominant (>99%) molybdenum‐containing product. Assignment of 4a as the syn ‐isomer with juxtaposed arylimido and Me 3 Si groups was made on the basis of double pulsed field gradient spin echo (DPFGSE) NOE experiments and confirmed by a single‐crystal x‐ray diffraction study. © 1997 John Wiley & Sons, Ltd.