Cyclogallazanes. Part III. (N-polymethylene)cyclogallata-azonianes

Abstract

A series of novel, volatile, cyclogallata-azonianes [dH2*(CH2);h*GaH2],, (wherex = 1, 2, 3, or 4; n = 2 or 3). has been prepared and characterized. Analogous aluminium and boron compounds have been prepared and comparative studies have been made on the three series of compounds. Factors governing the degree of association, n, of the compounds are discussed and ring strain and additional arguments are invoked to explain the tendency of some of the compounds to undergo ring fission and polymerization.

Dimeric piperidino-alane and -gallane: metal hydrides with a cyclic M(µ-N)2M core (M = Al or Ga)

“…2). The dimeric structure of the gallane is in keeping with that suggested by Storr et al 12 on the evidence of solution studies. On the other hand, cryoscopic a Atom numbering scheme as shown in Fig.…”

“…measurements suggest that both dimeric and trimeric forms of the alane may coexist in benzene solutions. 12 Between the dimeric molecules of The dimeric molecular structures thus contrast with the trimeric structure assumed in the crystalline state by the aziridinogallane, [CH 2 CH 2 NGaH 2 ] 3 , 13 the compound most closely related to 1 and 2 for which definitive information is available. Presumably the greater spatial requirements of the piperidino compared with the relatively compact aziridino ligand are responsible for this change.…”

“…The identities and purities of the two products 1 and 2 were checked by reference to their IR and Raman spectra and to the 1 H NMR spectra of [ 2 H 8 ]toluene solutions and comparison with previous reports. 12 For X-ray analysis, crystals of 2 were selected and transferred under dry nitrogen at ambient temperatures; crystals of 1 were selected from under cold perfluoropolyether RS3000 oil.…”

Imines, Cyclic

“…(B,Al,Ga,In). Ethyleneimine forms cyclic trimers with hydrides or alkyls of elements of Group IIIA, with the liberation of hydrogen or hydrocarbons (143)(144)(145)(146). In the case of diborane or trimethylboron, the initial adducts can be isolated (147)(148)(149)(150).…”

“…These aziridine boranes on the one hand undergo electrophilic reactions with opening of the aziridine ring, and on the other hand have the reducing properties of aziridine boranes (149) (see Hydroboration). Aziridinylalane trimer polymerizes on standing with reductive ring opening (145,151).…”