`Jumping crystals': X-ray structures of the three crystalline phases of (±)-3,4-di-O-acetyl-1,2,5,6-tetra-O-benzyl-myo-inositol

(±)-3,4-Di-O-acetyl-,2,5,6-tetra-O-benzyl-myo-inositol, C 38 H 40 O 8 , M r =624.7 («jumping crystal»). Three monoclinic crystal forms. Form I, T= 18 o C, P2 1 /n, a=28.883 (3), b=15.189 (2), c= 15.566 (2) A, β=100.37 (1) o , V=6717 (1) A 3 , Z= 8, R=0.090 for 5788 reflections [F>σ(F)]. Form II, T=18 o C [T=60 o C], P2 1 /c, a=14.269 (2) [14.464 (6)], b=14.862 (2) [14.923 (5)], c= 16.506 (3) A [16.385 (6) A], β=103.21 (1) o [102.73 (3) o ], V=3407 (1) A 3 [3450 (2) A 3 ], Z=4, R=0.086 [0.093] for 3505 [2338] reflections [F>σ(F)]