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The mol-ecular structure of 5,5'-bis(-hydroxy-methyl)-3,3'-biisoxazole, C 8 H 8 N 2 O 4 ( 1 ), is composed of two trans planar isoxazole rings [r.m.s deviation = 0.006 (1) Å], each connected with a methyl hydroxyl group. Similarly, the structure of 4,4',5,5'-tetrakis-(hydroxy-methyl)-3,3'-biisoxazole, C 10 H 12 N 2 O 6 ( 2 ), is composed of two planar isoxazole rings [r.m.s. deviation = 0.002 (1) Å], but with four hydroxymethyl groups as substituents. Both mol-ecules sit on a center of inversion, thus Z ' = 0.5. The crystal structures are stabilized by networks of O-H⋯N [for ( 1 )] and O-H⋯O hydrogen-bonding inter-actions [for ( 2 )], giving rise to corrugated supra-molecular planes. The isoxazole rings are packed in a slip-stacked fashion, with centroid-to-centroid distances of 4.0652 (1) Å for ( 1 ) (along the b -axis direction) and of 4.5379 (Å) for ( 2 ) (along the a -axis direction).

Crystal structures of 5,5′-bis(hydroxymethyl)-3,3′-biisoxazole and 4,4′,5,5′-tetrakis(hydroxymethyl)-3,3′-biisoxazole