Synthesis of Cage Compounds Containing Boron, Tin, and Phosphorus Atoms.
The 1:1 reactions of [((i)()Pr(2)N)BP(H)B(N(i)()Pr(2))PLi.DME] (1) and [(tmp)BP(H)B(tmp)PLi.DME] (2; tmp = 2,2,6,6-tetramethylpiperidino) with organylhalostannanes have been examined, and stannyl-substituted diphosphadiboretanes, (R(2)N)BP(H)B(NR(2))PSn(Cl)R'(2) (R(2)N = (i)()Pr(2)N, tmp; R' = Me, (t)()Bu) have been isolated and characterized. Dehydrohalogenation of these compounds with (t)()BuLi produced bicyclic cage compounds P(2)(R(2)NB)(2)SnR'(2) (R(2)N = (i)()Pr(2)N (9), tmp (8); R' = (t)()Bu) or an oligomer [-P(R(2)NB)(2)PSn(R'(2))-] (R(2)N = tmp; R' = Me). The 2:1 reactions of R'(2)SnCl(2) with 1 and 2 have been studied, and with a small R' group (Me) a disubstitution product, [HP(tmpB)(2)P](2)SnMe(2) (11), is obtained. With a larger R' group ((t)()Bu), cage products P(2)(tmpB)(2)Sn(t)()Bu(2) and P(2)((i)()Pr(2)NB)(2)Sn(t)()Bu(2) are isolated. The molecular structures of 8 and 9 have been determined by single crystal X-ray diffraction techniques, and these structures and their spectroscopic features are discussed in relation to other boron-phosphorus cage compounds.
Chen
Tuqiang
T
Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, and Institut für Anorganische Chemie, Universität München, 80333 München, Germany.
Duesler
Eileen N.
EN
Paine
Robert T.
RT
Nöth
H.
H