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. 2018 Jan 9;23(1):129. doi: 10.3390/molecules23010129

Table 4.

Proof of the bond length for the position of H at O1 [43].

Bond Lengths in Crystalline Organic Compounds Compound 1
d m σ ql qu
in pyrazole: (N1–N2) 1.366 1.366 0.019 1.350 1.375 N1 N2 single bond 1.376
in pyrazole: (N2=C3) 1.329 1.331 0.014 1.315 1.339 N1 C7 double bond 1.329
in pyrazole: (N1–C5) 1.357 1.359 0.012 1.347 1.365 N1 C9 single bond 1.354
in enols: C=C–OH 1.333 1.331 0.017 1.324 1.342 C7 O1 single bond 1.339
in phenols: Caromatic-OH 1.362 1.364 0.015 1.353 1.373
in lactams: (C=O) 1.240 1.241 0.003 1.237 1.243
in benzoquinones: (C=O) 1.222 1.220 0.013 1.211 1.231

d is the unweighted mean in Å of all the values for that bond length found in the sample; m is the median in Å of all values; σ is the standard deviation in the sample; ql is the lower quartile for the sample; qu is the upper quartile for the sample.