Photoinduced umpolung addition of carbonyl compounds with α,β-unsaturated esters enables the polysubstituted γ-lactone formation.
Gu, Jia-Yi; Zhang, Wei; Jackson, Seth R.; He, Yan-Hong; Guan, Zhi; Chemical communications (Cambridge, England) 56 (2020) 13441–13444; doi:10.1039/d0cc05306f

data_7127390
_publ_section_title
;
 Photoinduced umpolung addition of carbonyl compounds with
 \a,\b-unsaturated esters enables the polysubstituted \g-lactone
 formation.
;
_journal_issue                   87
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              13441
_journal_page_last               13444
_journal_paper_doi               10.1039/d0cc05306f
_journal_volume                  56
_journal_year                    2020
_chemical_formula_sum            'C23 H20 O2'
_chemical_formula_weight         328.39
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2017/1
_audit_update_record
;
2020-02-20 deposited with the CCDC.	2020-10-05 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 96.7434(14)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.11677(9)
_cell_length_b                   21.9208(3)
_cell_length_c                   13.21139(19)
_cell_measurement_temperature    293(2)
_cell_volume                     1759.19(4)
_computing_structure_refinement  'SHELXL-2017/1 (Sheldrick, 2017)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.984
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0199
_diffrn_reflns_av_unetI/netI     0.0165
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.984
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            13071
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.984
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         71.912
_diffrn_reflns_theta_min         3.927
_exptl_absorpt_coefficient_mu    0.611
_exptl_crystal_density_diffrn    1.240
_exptl_crystal_F_000             696
_refine_diff_density_max         0.124
_refine_diff_density_min         -0.198
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.045
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     227
_refine_ls_number_reflns         3412
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.045
_refine_ls_R_factor_all          0.0476
_refine_ls_R_factor_gt           0.0430
_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^)+(0.0529P)^2^+0.2729P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1083
_refine_ls_wR_factor_ref         0.1121
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3020
_reflns_number_total             3412
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0cc05306f2.cif
_cod_data_source_block           gz200102
_cod_depositor_comments
'Adding full bibliography for 7127389--7127390.cif.'
_cod_original_cell_volume        1759.19(5)
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7127390
_shelx_shelxl_version_number     2017/1
_shelx_res_checksum              34160