ISSN:
0009-2940
Keywords:
Dithiatetrazadiborocines
;
Tungsten complexes
;
Titanium complexes
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Synthesis and Complexation of Dithiatetrazadiborocines(Dialkylamino)dichloroboranes R2NBCl2 react with N,N'-bis-(trimethylsilyl)sulfur diimide to give a novel class of compounds, the eight-membered rings 3,7-bis(dialkylamino)-3H,7H-1λ4,5λ4,2,4,6,8,3,7-dithiatetrazadiborocines (1). The derivates with R = n-propyl (1a), isopropyl (1b), and n-butyl (1c) have been synthesized and characterized. The X-ray structure analysis of 1b shows the molecule to have a boat-like configuration with two N=S=N functions connected via the BNR2 groups. Although the B atoms are linked to three N atoms, only the exocyclic nitrogen is engaged in π bond interactions with the boron. 1b reacts with W(CO)5(THF) to form the dinuclear complex 2, which is also investigated by means of an X-ray structure analysis. One W(CO)5 fragment is coordinated to a nitrogen atom of one N=S=N unit, whereas another W(CO)5 group is linked to the S atom of the second SN2 function. However, the original sulfur diimide has changed into a sulfur diamide group HN-S-NH. A similar change of a N=S=N unit happens on treatment of 1b with Cp(CO)3WH leading to 3. As the X-ray structure analysis shows, in 3 again one sulfur diimide group retains its original character. The second SN2 unit has turned into a sulfur amide function, where one N atom binds the H atom of Cp(CO)3WH, the other one is linked to one of the CO ligands to form a carbonyl bridge between N and W. Among a series of other complexes only TiCl4 has additionally been found to react with 1b to yield 1b · 2 TiCl4, the structure of which is still unknown.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19931260804
