Structural studies of organoboron compounds LIX. Reaction of two sterically hindered N,N′-dihydroxyaminals with phenylboronic acid, and the crystal and molecular structures of the resulting 1,3,5-trioxa-6,8-diaza-2,4-diboracyclooctanes and one of the adducts

Abstract

The syntheses of the sterically hindered N,Nf-dihydroxyaminals; N,Nf-bis(1-ethoxycarbonyl-1-methylethyl)-N,N1-dihydroxymethanediamine, l b , and N,N'-bis(l,l-dimethylethyl)-N,N'-dihydroxymethanediamine, l c , and their reactions with phenylboronic acid to yield the 1,3,5-trioxa-6,s-diaza-2,4~diboracyclooctanes 3 and 4, respectively, are described. Crystals of l b are tetragonal, a = 18.413(1), c = 9.867(2) A, Z = 8, space group 14,; those of 3 are mono-

Triphenyl(tetrahydrofuranyl)boron

“…The formation of B(C6Hs)3 from [B(C6H5)4]-has considerable precedence (Kliegel, Lubkowitz, Rettig & Trotter, 1993;Bakshi et al, 1994). A literature search (Allen et al, 1979) indicates that (C6Hs)3B(thf) is only the second (C6Hs)BB(solvent) structure known.…”