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. 2013 Jan 9;69(Pt 2):o202–o203. doi: 10.1107/S1600536812051902

Table 1. Possible structure/reactivity relationships (°, Å).

  1-OPBB 2-OPBB 3-OPBB 4-OPBB 5-OPBB
Solvolysis ratea 210 480 28 1.0 10−11
1:2 inter­planar angleb 121.9 (2) 119.8 (6) 122.9 (3) 124.5 (1) 121.2 (1)
3:4 inter­planar angle 132.0 (1) 132.4 (4) 128.1 (2)    
C11—O2 bond lengthb 1.450 (2) 1.460 (7) 1.437 (3) 1.445 (2) 1.447 (2)

Notes: (a) Rates determined in 80% dioxane-d 8/20% D2O at 383 K, from NMR peak integrations; (b) C1/C7/C4 is plane 1 and C1/C2/C3/C4 is plane 2 for 4-OPBB and 5-OPBB; bond length is C7—O2 for 4-OPBB and 5-OPBB.