Structural formula for 2-amino-2-metYJ.-.,.-=~"~~"="~". 2-h~1~o-Z-methyl-1,3-propsnediol can be crystallized fromThe crystals used in this study were obtained by allowing a warm isopropyl alcohol solution to cool. The resulting crystals are needles and rods elongated parallel to the c axis.acetone or from the lower alcohols. C

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Structural formula for tris( hydroxyniethy1)aniinomethaneRIs (hydroxymethy1)aminomethane can be crystallized from T isopropyl alcohol containing about 20% water. The resulting crystals are needles elongated parallel to the c auis, which may not show complete development of the end faces. Several commercial samples have shown the complete coniplenieiit of faces mentioned helow. C I -a bFigure 1. Orthographic projection of a typical crystal of tris(hydroxymethy1)aminomethaneThe behavior of this materlal on fusion is unusual, When the crystals are heated on a microscope hot stage as in a melting point determination, there is a sharp loss of birefringence nt 135" C. b u t without loss of external form. If the temperature is lowered while the material is in this state, the orientation of the resulting crystals bears no relation to the shape of the original crystals. The final melting point or complete reduction to a melt a t 172-173" C. is sharp. It is this final figure that is recorded in the literature as the melting point of this compound.

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