Engaging electronic effects for atropselective [5+2]-photocycloaddition of maleimides
Ramya Raghunathan; Elango Kumarasamy; Steffen Jockusch; Angel Ugrinov; J. Sivaguru; Chem.Commun. 52 (2016) 8305–; doi:

data_7119617
_publ_section_title
;
 Engaging electronic effects for atropselective [5+2]-photocycloaddition
 of maleimides
;
_journal_name_full               Chem.Commun.
_journal_page_first              8305
_journal_volume                  52
_journal_year                    2016
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C15 H15 N O2'
_chemical_formula_sum            'C15 H15 N O2'
_chemical_formula_weight         241.28
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2012-11-02
_audit_creation_method
;
  Olex2 1.2
  (compiled Oct 26 2012 17:06:22, GUI svn.r4371)
;
_audit_update_record
;
2016-03-22 deposited with the CCDC.
2016-05-23 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.9647(2)
_cell_length_b                   9.5076(3)
_cell_length_c                   16.0492(5)
_cell_measurement_reflns_used    5538
_cell_measurement_temperature    100
_cell_measurement_theta_max      67.73
_cell_measurement_theta_min      5.41
_cell_volume                     1215.33(6)
_computing_data_reduction        'SAINT v7.68A (Bruker, 2009)'
_computing_molecular_graphics
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_publication_material
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_structure_refinement
;
XL, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_computing_structure_solution
;
XS, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_diffrn_ambient_temperature      100.0
_diffrn_measured_fraction_theta_full 0.972
_diffrn_measured_fraction_theta_max 0.972
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0241
_diffrn_reflns_av_unetI/netI     0.0251
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            7249
_diffrn_reflns_theta_full        67.72
_diffrn_reflns_theta_max         67.72
_diffrn_reflns_theta_min         5.41
_diffrn_source                   'fine-focus sealed tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.704
_exptl_absorpt_correction_T_max  0.7530
_exptl_absorpt_correction_T_min  0.6896
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2008/1 (Bruker,2008) was used for absorption correction.
wR2(int) was 0.0551 before and 0.0351 after correction.
The Ratio of minimum to maximum transmission is 0.9158.
The \l/2 correction factor is 0.0015.
;
_exptl_crystal_colour            'clear yellow'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.319
_exptl_crystal_density_meas      .
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       chunk
_exptl_crystal_F_000             512
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.141
_refine_diff_density_min         -0.184
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.16(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.104
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     165
_refine_ls_number_reflns         2119
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.104
_refine_ls_R_factor_all          0.0283
_refine_ls_R_factor_gt           0.0277
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0357P)^2^+0.2026P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0679
_refine_ls_wR_factor_ref         0.0684
_reflns_number_gt                2077
_reflns_number_total             2119
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6cc02962k2.cif
_cod_data_source_block           2b_PkA
_cod_database_code               7119617
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  H12 of C12, H8 of C8, {H6A,H6B} of C6, {H4A,H4B} of C4, H5 of C5, H10 of
  C10, H9 of C9
 At 1.5 times of:
  {H14A,H14B,H14C} of C14, {H1A,H1B,H1C} of C1
2.a Ternary CH refined with riding coordinates:
 C5(H5)
2.b Secondary CH2 refined with riding coordinates:
 C4(H4A,H4B), C6(H6A,H6B)
2.c Aromatic/amide H refined with riding coordinates:
 C8(H8), C9(H9), C10(H10), C12(H12)
2.d Idealised Me refined as rotating group:
 C1(H1A,H1B,H1C), C14(H14A,H14B,H14C)
;