ISSN:
0009-2940
Keywords:
10-Organo-10-aza-nido-nonaborates
;
6-Alkylamine-4-aryl-4-aza-arachno-nonaboranes
;
1-Orgaro-1-aza-closo-decaboranes
;
6-Aryl-6-aza-nido-decaboranes
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Synthesis and Degradation of Azadecaboranes; Aza-nido-nonaborateThe boranes arachno-B9H13(NRH2 (1a-c: R = p-ClC6H4, p-MeC6H4, PhCH2) are dehydrogenated at 140°C to give nido-RNB9H11 (2a-c), from which the azaboranes closo-RNB9H9 (3a-c) are formed on further dehydrogenation at 460°C. These azaboranes are deboronated either by the attack of the amine iPrNH2 or by one of the fluorides [NBu4]F or [S(NMe2)3][Me3SiF2] in THF. One of the four boron atoms adjacent to nitrogen in the closo species is removed and then detected in the borazine (HNBiPr)3 or the borate BF4, respectively, whereas the novel anions nido-RNB8H9 (4a-c) remain. The structure of 4a-c corresponds to that of nido-SB8-H9-, according to NMR spectra. Primary amines R'NH2 deboronate the closo-boranes 3a, b in a solvent less polar than THF to give the amine - azanonaboranes arachno-RNB8H10-(NR'H2) (5a-c: R' = iPr, Pr, Bu). The nido product [iPrNH3][(p-ClC6H4)NB8H9 is converted into a mixture of the arachno products 5a and (p-ClC6H4)NB8H10(NPrH2) (5d) by the action of PrNH2, making plausible that anions of type 4 are intermediates during the transformation of 3 into 5.
Additional Material:
1 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19951281213
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