The molecular structures of (<i>RS</i>)‐1,2‐diphenylethyl methacrylate and (<i>RS</i>)‐α‐<i>tert</i>‐butylbenzyl methacrylate

<jats:title>Abstract</jats:title><jats:p>The molecular structures of (<jats:italic>RS</jats:italic>)‐1,2‐diphenylethyl methacrylate (DPEMA) and (<jats:italic>RS</jats:italic>)‐α‐<jats:italic>tert</jats:italic>‐butylbenzyl methacrylate (<jats:italic>t</jats:italic>‐BBMA) were determined by means of X‐ray diffraction. Crystals of (<jats:italic>RS</jats:italic>)‐DPEMA are monoclinic, space group <jats:italic>C</jats:italic>2/<jats:italic>c</jats:italic>, <jats:italic>a</jats:italic> = 33,341(3), <jats:italic>b</jats:italic> = 5,916(1), <jats:italic>c</jats:italic> = 15,911(2) Å, β = 106,42(1)°, and <jats:italic>Z</jats:italic> = 8. Crystals of (<jats:italic>RS</jats:italic>)‐<jats:italic>t</jats:italic>‐BBMA are also monoclinic, space group <jats:italic>P2<jats:sub>1</jats:sub>/c, a</jats:italic> = 6,028(1), <jats:italic>b</jats:italic> = 31,009(3), <jats:italic>c</jats:italic> = 15,207(1) Å, β = 96,780(8)°, and <jats:italic>Z</jats:italic> = 8. Both structures were solved by the direct method and refined by the block‐diagonal least‐squares procedure: DPEMA, <jats:italic>R</jats:italic> = 0,113 for 1 100 observed reflections and <jats:italic>t</jats:italic>‐BBMA, <jats:italic>R</jats:italic> = 0,081 for 2206 non‐zero reflections, respectively. The molecule of DPEMA has an <jats:italic>antiperiplanar</jats:italic> conformation as to the CC and CO double bonds about the C(1)C(2) bond, a <jats:italic>synperiplanar</jats:italic> conformation as to the CO and CO bond about the C(1)O(1) bond, and an <jats:italic>anticlinal</jats:italic> conformation about the O(1)C(5) bond. One of the two <jats:italic>t</jats:italic>‐BBMA molecules in an asymmetric unit has an <jats:italic>antiperiplanar</jats:italic> conformation as to the CC and CO double bonds about the C(1)C(2) bond, whereas the other <jats:italic>antiperiplanar</jats:italic> molecule may contain some <jats:italic>synperiplanar</jats:italic> conformation. Both molecules have a <jats:italic>synperiplanar</jats:italic> conformation as to the CO and CO bonds about the C(1)O(1) bond and an <jats:italic>anticlinal</jats:italic> conformation about the O(1)C(5).</jats:p>