Quaternary Carbon Construction through Piancatelli Rearrangement: Easy Access to Spirocyclopentenones
Solanke, Pooja R.; Cinsani, Radhika; Nayani, Kiranmai; Mainkar, Prathama S.; Chandrasekhar, Srivari; Chemical Communications  (2022) –; doi:10.1039/D2CC00050D

data_7129906
_publ_section_title
;
 Quaternary Carbon Construction through Piancatelli Rearrangement: Easy
 Access to Spirocyclopentenones
;
_journal_name_full               'Chemical Communications'
_journal_paper_doi               10.1039/D2CC00050D
_journal_year                    2022
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C12 H9 N O3'
_chemical_formula_sum            'C12 H9 N O3'
_chemical_formula_weight         215.20
_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'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2021-08-21 deposited with the CCDC.	2022-03-29 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.0423(14)
_cell_length_b                   8.8382(13)
_cell_length_c                   17.048(3)
_cell_measurement_reflns_used    3047
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      25.66
_cell_measurement_theta_min      2.59
_cell_volume                     1061.1(3)
_computing_cell_refinement       '<i>SAINT</i> (Bruker, 2016)'
_computing_data_collection       '<i>APEX3</i> (Bruker, 2016)'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  '<i>SHELXL2014</i> (Sheldrick, 2015)'
_computing_structure_solution    '<i>SHELXT</i> (Sheldrick, 2015)'
_diffrn_ambient_temperature      294(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Bruker SMART APEX CCD area-detector'
_diffrn_measurement_method       \w
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0780
_diffrn_reflns_av_unetI/netI     0.0675
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.992
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            10127
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.991
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.593
_diffrn_reflns_theta_min         2.596
_exptl_absorpt_coefficient_mu    0.098
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.6303
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Bruker, 2016'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.347
_exptl_crystal_description       block
_exptl_crystal_F_000             448
_exptl_crystal_size_max          0.280
_exptl_crystal_size_mid          0.160
_exptl_crystal_size_min          0.130
_refine_diff_density_max         0.157
_refine_diff_density_min         -0.200
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details
;
 Flack x determined using 497 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.1(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.117
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     153
_refine_ls_number_reflns         2198
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.117
_refine_ls_R_factor_all          0.0963
_refine_ls_R_factor_gt           0.0636
_refine_ls_shift/su_max          0.008
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0590P)^2^+0.1051P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1260
_refine_ls_wR_factor_ref         0.1375
_reflns_Friedel_coverage         0.697
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.989
_reflns_number_gt                1613
_reflns_number_total             2198
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d2cc00050d2.cif
_cod_data_source_block           KA1113_0m
_cod_database_code               7129906
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.973
_shelx_estimated_absorpt_t_max   0.987
_shelx_res_checksum              29042
_shelx_hkl_checksum              69876