BORON SPIROCHELATES DERIVED FROM 2-ISOPROPOXY-4H-1,3,2-BENZODIOXABORIN

2-(beta-diketonato-4H-1,3,2-benzodioxaborin, [OC6H4CH2OBOC(R):CHCO(R') ], (R = R' = Me, Ph), N-alkylsalicylaldimino)-4H-1,3,2,-benzodioxabori n, [OC6H4CH2OBOC6H4CH:N(R)], (R - Me, Et, n-Pr, n-Bu, Ph) and kylamino -3-pentene-2-on)4H-1,3,2,-benzodioxaborin, [OC6H4CH2OBOC(Me):CHC(Me):N (R)], (R = Me, Et, CH2Ph, Ph) obtained by the reactions of 2-isopropox y-4H-1,3,2-benzodioxaborin with beta-diketonates, N-alkylsalicylaldimi nies and 4-alkylamino-3-pentene-2-ones, respectively, are white or yel low colored monomeric solids. These compounds have been characterized by elemental analyses, molecular weight measurements, IR and NMR (H-1 and B-11) ata. On the basis of the above studies the tetra-coordinated nature of boron has been established in these compounds.