X-ray powder diffraction data for monoclinic metazachlor, 2-chloro- N -(pyrazol-1-ylmethyl) acetyl-2′, 6′-xylidide

X-ray powder diffraction data and unit cells parameters for a monoclinic variety of the popular herbicide 2-chloro- N -(pyrazol-1-ylmethyl) acetyl-2′, 6′-xylidide, commonly known as metazachlor, butisan, and butichlor, is presented [ a =7.306(3) Å, b =17.824(9) Å, c =10.728(3) Å, β =98.46(4)°, space group P 2 1 / c , cell volume=1381.82 Å 3 , Z =4]. The four strongest peaks (Irel>25) at 8.87, 7.19, 4.57, and 4.45 Å are quite distinctive, thus X-ray powder diffraction provides a quick, simple, and definitive method of identifying this form of material from other commercially available herbicide products.