Simple Organometallics and Organometallic Halides

New triorganogallium compounds which have been synthesised from GaX3 (X = Cl, Br) and RMgBr include R = PhMe2CCH2,  

Interest in the reaction of R3M with aza-macrocycles seems to be waning after two years of intense activity, though two new examples have appeared. (Hcyclen)As reacts with Me3Ga to form a 1 1 adduct retaining the N-H bond of the ligand, and in which 

In addition to the report of the reactions of (Bis)2 BuAl and (Bis) Bu2Al with TMEDA mentioned earlier (Section 1.1) three other studies have dealt with the reactions of R2NCH2CH2NR2 (R = 

The structure of S, S-diazaaluminolidine (1), a chiral compound which has been used in enantioselective Diels-Alder reactions, has been determined, and forms a dimeric structure embodying an eight-membered (A1NS0 2 ring through intramolecular S=0 — A1 coordination.  

Two reviews, one covering the use of silylarsines in the synthesis of Ga-As compounds and the other a more general review of Ga-As species, have appeared and will be of interest. 

Bis-(trifluoromethyl)cadmium has been found to react with MCI3 (M = In,Ga) in basic, aprotic solvents (DMF,MeCN), though in a rather indiscriminate manner. All the compounds (CF3)nMCl3 n have been observed in the F nmr of reaction mixtures along with the gallate [(CF3)4Ga ], from which only a limited number of solvated complexes have been isolated and characterised. 

The bi-metallic compounds CI2AI(CH2)nAlCl2 have been used as precursors for their corresponding higher alkylates. Thus, 

Interest in the stabilisation of R3M species by intramolecular coordination continues, with three further reports adding to the significant volume of knowledge acciunulated in recent years. The ligand most widely used in this area, 

Finally at the synthetic level, two reports on the chemistry of organometallic carboranes have appeared, dealing specifically 

AI2C2H4 geometries have been optimised by molecular mechanics calculation of probable vibrational frequencies shows 

Reaction of either (Mes) 3X0 or (Mes)2lnF with BF3.0Et2 gives [ (Mes) 2ln] [BF4] in which the indium cation has octahedral C2lnF4 coordination as part of infinite chains. 

Interest in intramolecularly stabilised organogallium and indium compounds has continued. (X)M(CH2CH2CH2NMe2)2 = Ga,In  

Other base-stabiUsed organometallics include the metallacyclopentanes and cyclohexanes [cycio-(CH2)nlM(CH2)3NMe2 (M = Ga,In n = 4,5) for which the GaC5 ring adopts a chair conformation, and dimeric [(C6F5)2ln(CH2)3NMe2l2 (In N  

The MOCVD potential of (Me2NCH2CH2C5H4) GaX2 (X = Me,Br,H), which are also monomeric due to intramolecular base stabilistaion, has been commented on.  

prepared cryogenically from AlBr and anisole, will be of interest to workers in this area.  

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