Highly functionalized alkenes produced from base-free organocatalytic Wittig reactions: (E)-3-benzylidenepyrrolidine-2,5-dione, (E)-3-benzylidene-1-methylpyrrolidine-2,5-dione and (E)-3-benzylidene-1-tert-butylpyrrolidine-2,5-dione.
Schirmer, Marie Luis; Spannenberg, Anke; Werner, Thomas; Acta crystallographica. Section C, Structural chemistry 72 (2016) 504–508; doi:10.1107/S2053229616008159

data_2311856
_publ_section_title
;
 Highly functionalized alkenes produced from base-free organocatalytic
 Wittig reactions: (E)-3-benzylidenepyrrolidine-2,5-dione,
 (E)-3-benzylidene-1-methylpyrrolidine-2,5-dione and
 (E)-3-benzylidene-1-tert-butylpyrrolidine-2,5-dione.
;
_journal_issue                   'Pt 6'
_journal_name_full
'Acta crystallographica. Section C, Structural chemistry'
_journal_page_first              504
_journal_page_last               508
_journal_paper_doi               10.1107/S2053229616008159
_journal_volume                  72
_journal_year                    2016
_chemical_formula_iupac          'C15 H17 N O2'
_chemical_formula_moiety         'C15 H17 N O2'
_chemical_formula_sum            'C15 H17 N O2'
_chemical_formula_weight         243.29
_chemical_name_systematic
;
(<i>E</i>)-3-Benzylidene-1-<i>tert</i>-butylpyrrolidine-2,5-dione
;
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014
_cell_angle_alpha                63.3851(11)
_cell_angle_beta                 85.2770(12)
_cell_angle_gamma                71.4797(12)
_cell_formula_units_Z            4
_cell_length_a                   10.2638(4)
_cell_length_b                   12.1068(4)
_cell_length_c                   12.2361(4)
_cell_measurement_reflns_used    9898
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      28.75
_cell_measurement_theta_min      2.54
_cell_volume                     1285.74(8)
_computing_cell_refinement
;
SAINT (Bruker, 2013)
;
_computing_data_collection
;
APEX2 (Bruker, 2014)
;
_computing_data_reduction
;
SAINT (Bruker, 2013)
;
_computing_molecular_graphics
;
XP in SHELXTL (Sheldrick, 2008) and Mercury (Macrae <i>et al.</i>,
2006)
;
_computing_publication_material
;
publCIF (Westrip, 2010)
;
_computing_structure_refinement
;
SHELXL2014 (Sheldrick, 2015)
;
_computing_structure_solution
;
SHELXS97 (Sheldrick, 2008)
;
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 8.3333
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEXII CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0536
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            42245
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.828
_diffrn_reflns_theta_min         1.866
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.99
_exptl_absorpt_correction_T_min  0.83
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(SADABS; Bruker, 2014)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.257
_exptl_crystal_description       plate
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.465
_exptl_crystal_size_mid          0.424
_exptl_crystal_size_min          0.102
_refine_diff_density_max         0.294
_refine_diff_density_min         -0.295
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.013
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     331
_refine_ls_number_reflns         6728
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.013
_refine_ls_R_factor_all          0.0750
_refine_ls_R_factor_gt           0.0472
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0712P)^2^+0.1550P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1181
_refine_ls_wR_factor_ref         0.1328
_reflns_number_gt                4663
_reflns_number_total             6728
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ov3077sup1.cif
_cod_data_source_block           III
_cod_database_code               2311856
_shelx_hkl_checksum              60437
_shelx_res_checksum              53468
_shelxl_version_number           2.014