ISSN:
0009-2940
Keywords:
Iminoborane
;
Triazadiboracyclohexane
;
Borazine
;
Diazadiboracyclobutane
;
Azaboracyclobutane
;
Diazadiboracyclopentane
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Polar Iminoboranes: Reactions of (tert-Butylimino)(pentafluorophenyl)boraneThe reactions of the iminoborane C6F5-B≡N-tBu (1) with nitriles and isonitriles are studied. Nitriles RCN give cycloadducts either of the triazadiboracyclohexane type (3a; R = iPr) or of the tetrazatriborabicyclo[4.2.0]octane type [4b-d; R = Ph, p-C6H4Me, p-C6H4(CF3)] or of the (iminomethyl)borazine type (5e, f; R = Me, Et). Isonitriles RNC yield mainly adducts of RNC to a cycloaddition product of the diazadiboracyclopentane type (6a, b; R = 2,6-C6H3Me2, tBu); the adduct of RNC to a diazadiboracyclobutane may be a side-product (7b; R = tBu). The iminoborane Me3Si(tBu)N-B=NtBu reacts with two molecules of (2,6-C6H3Me2)NC to give the corresponding azaboracyclobutane 8. The iminoborane tBu-B≡N-C6F5 (1′), formed by gas-phase elimination of ClSiMe3 from Cl(tBu)B = N(C6F5)SiMe3 (9), cyclodimerizes more readily than the isomeric borane 1. The cyclodimer 2′ gives 1:1-addition reactions with tBuNC, PMe3, and MeNC, respectively; the added components fluctuate in solutions of the products 7b'-d'. A similar fluctuation is observed with the 1:1 adduct 7c from PMe3 and the cyclodimer 2 of the iminoborane 1. The products 3a, 5e, 6a, 8 crystallize in the space groups P21/c, P21/n, Pbca, and P21/c, respectively.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19951281012
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