Synthetic and Structural Studies of Gallium−Phosphorus, Gallium−Arsenic, and Indium−Phosphorus Compounds with Chromophoric Substituents

Seven group 13/15 four-membered-ring compounds of the general type [R 2 ME- t -Bu 2 ] 2 bearing the chromophoric substituents (R) vinyl, allyl, and benzyl have been synthesized by treatment of t -Bu 2 PLi or t -Bu 2 AsLi with the appropriate gallium or indium chloride, R 2 MCl (prepared in situ ), in Et 2 O solution: 3 (R = vinyl, M = Ga, E = P); 4 (R = vinyl, M = In, E = P); 5 (R = allyl, M = In, E = P); 6 (R = allyl, M = Ga, E = As); 7 (R = benzyl, M = In, E = P); 8 (R = benzyl, M = Ga, E = As); 10 (R = vinyl, M = Ga, E = As). The partially substituted derivative [(vinyl)ClGaAs- t -Bu 2 ] 2 ( 9 ) was prepared by a similar one-pot procedure. All eight new compounds were characterized by X-ray crystallography, NMR, and mass spectroscopy. Compounds 3 − 8 absorb light at relatively long wavelengths with cutoffs ranging from ∼300 nm for the vinyl-substituted compounds to ∼330 nm for the corresponding allyl- and benzyl-substituted derivatives.