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Structure of a Non‐classically Bridged Methyleneborane in the Crystal
Author(s) -
Wieczorek Christine,
Allwohn Jürgen,
SchmidtLukasch Günter,
Hunold Ralf,
Massa Werner,
Berndt Armin
Publication year - 1990
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199003981
Subject(s) - bridging (networking) , carbocation , crystallography , crystal structure , physics , chemistry , molecular physics , photochemistry , computer science , computer network
Bridging as a drastic consequence of intense σ‐π interaction was predicted as long ago as 1984, and now it has been verified experimentally. Methyleneboranes 1 exist as the bridged structure 1a , a conclusion derived from the unusually small B‐C‐B angle (calc. for R 1 = R 2 = H, 78.1/78.8°; obs. for R 1 =GeMe 3 ,R 2 = 2,3,4,6‐Me 4 C 6 H, 78.5(4)°). As in the case of non‐classical carbocations, the shielding of the formally electron‐deficient center in 1 is much greater than that observed with corresponding classical compounds