tert-Butyl compounds of gallium

Abstract

The tert-butyl substituted compounds of gallium have been synthesized and characterized: [(^tBu)₂Ga{μ-OCH(CF₃)₂}]₂ (1), [(^tBu)₂Ga(μ-O₂CEt)]₂ (2), [(^tBu)₂Ga(μ-O₂CCF₃)]₂ (3), [(^tBu)₂Ga{μ-OC(Ph)N(H)}]₂ (4), [(^tBu)₂Ga{μ-OC(Me)NPh}]₂ (5), (^tBu)₃Ga[OC(Ph)NMe₂] (6), (^tBu)₃Ga[OP(Ph)₂NH(ⁿPr)] (7), (^tBu)₂Ga[ON(H)C(O)Ph] (8), [(^tBu)₂Ga{μ-O₂S(CF₃)O}]₂ (9), (^tBu)₂Ga(μ-Cl)₂Li(HOⁱPr)₂ (10), and [Li(HOⁱPr)₄][(^tBu)₂GaCl₂] (11). X-Ray crystallographic characterization was obtained for compounds 1–6 and 8–11. Compounds 10 and 11 exhibit three-dimensional hydrogen bonded networks in which augmentation of the O–H⋯Cl hydrogen bond is proposed to be due to the increased acidity of alcohols bonded to the Lewis acidic lithium ions. A discussion of the dependence of the puckering of the chair-like conformation in eight-membered cyclic compounds of the Group 13 metals is presented.