Structural studies of organoboron compounds. XXVII ...

Structural studies of organoboron compounds. XXVII.' (3-Hydroxy-2-methyl-4-pyridinonato)diphenylboron and (3-hydroxy-1,2-dimethyl-4-pyridinonato)diphenylboron WILLIAM 0. NELSON,CHRISORVIG,STEVEN J. RETTIG,A N D JAMESTROTTER

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Department of Chemistry, Urziversity of British Col~tmbia,2036 Mait1 Mall, Varlcouver, B. C., Canadc~V6T IY6 Received March 1I, 1987 0 . NELSON,CHRISORVIG,STEVEN J. RETTIG,and JAMES TROTTER. Can. J. Chem. 66, 132 (1988). WILLIAM Details of the preparation and crystal structures of the title compounds are given. Crystals of (3-hydroxy-2-methyl-4pyridinonato)diphenyIboron, 1, are orthorhombic, a = 13.4010(6), b = 15.005(1), c = 14.833(1)A, Z = 8, space group Pbca, and those of (3: hydroxy -1,2-dimethyl-4-pyridinonato)diphenyboron2, are monoclinic, a = 8.2617(5), b = 12.374(1), c = 16.104(1) A, P = 92.741(5)", Z = 4, space group P 2 1/ r l . Both structures were solved by direct methods and were refined by full-matrix least-squares procedures to R = 0.047 and 0.071 for 1654 and 1831 reflections with 1 2 3u(I), respectively. Both molecules contain five-membered C202Bchelate rings, that in 2 being nearly planar. Structural data indicate weaker overall binding of the ligand oxygen atoms to boron in 1 than in 2. Bond lengths (corrected for libration) are 0-B = 1.497(5) and 1.650(5), C-B = 1.600(5) and 1.599(5) for 1; 0-B = 1.542(5) and 1.569(5), C-B = 1.607(6) and 1.609(6) A for 2.

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WILLIAM 0 . NELSON,CHRISORVIG,STEVEN J. RETTIGet JAMES TROTTER. Can. J. Chem. 66, 132 (1988). On rapporte les dCtails relatifs a la prtparation et a la determination des structures cristallines des composCs mentionnts dans le titre. Le (hydroxy-3 mtthyl-2 pyridinonato-4) diphknylbore, 1, est orthorhombique avec a = 13,4010(6), b = 15,005(1) et c = 14,833(1) Z = 8 et groupe d'espace Pbca; par ailleurs, ceux du (hy