ISSN:
0009-2940
Keywords:
1,4-Diboranaphthalines
;
2,7-Diboradodeca-1,3,9,11-tetraenes
;
Cobalt complexes
;
Rhodium complexes
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Synthesis and Complexation of 1,4-Dimethyl-2,3-bis(isopropylidene)-1,4-diboratetraline1,4-Dimethyl-2,3-bis(isopropylidene)-1,4-diboratetraline (2) is obtained from o-dilithiumbenzene and 2,5-dimethyl-3,4-bis(chloromethylboryl)-2,4-hexadiene in 61% yield. Its complexation with cyclopentadienylbis(ethene)cobalt leads to the triple-decker bis(η5-cyclopentadienylcobalt)-μ-η6,η6-1,4-dimethyl-2-isopropenyl-3-isopropyl-1,4-dihydro-1,4-dibora-naphthaline (3) in low yield. However, the reaction of 2 with (C5H5)Rh(C2H4)2 and (C5Me5)Co(C2H4)2 originates complexes of a tricyclic ligand formed from 2 via conrotatoric [2 + 2] cycloaddition of the isopropylidene groups. (η5-Cyclo-pentadienylrhodium)-η6-tricyclo-[6.4.0.03,6]-2,4,4,5,5,7-hexamethyl-2,7-diboradodeca-1,3,9,11-tetraene (4), (η5-pentamethylcyclopentadienylcobalt)-η6-tricyclo-[6.4.0.03,6]-2,4,4,5,5,7-hexamethyl-2,7-diboradodeca-1,3,9,11-tetraene (5) and its related dinuclear complex 6 could be isolated in 29, 10, and 31%, respectively. Their constitutions are derived from spectroscopic data and proven by X-ray structure analysis of 4.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19951280216
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