Selenium dioxide promoted selenylation/cyclization of leucosceptrane sesterterpenoids.
Geng, Hao; Fu, Ran; Zhou, Ting-Ting; Li, Man; Liu, Yan-Chun; Li, Xiao-Nian; Liu, Yan; Zheng, Yu; Li, Sheng-Hong; Chemical communications (Cambridge, England) 60 (2024) 10512–10515; doi:10.1039/d4cc03674c

data_7133635
_publ_section_title
;
 Selenium dioxide promoted selenylation/cyclization of leucosceptrane
 sesterterpenoids.
;
_journal_issue                   76
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              10512
_journal_page_last               10515
_journal_paper_doi               10.1039/d4cc03674c
_journal_volume                  60
_journal_year                    2024
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C25 H32 O6 Se'
_chemical_formula_sum            'C25 H32 O6 Se'
_chemical_formula_weight         507.46
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_audit_update_record
;
2024-07-16 deposited with the CCDC.	2024-08-29 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 97.2010(10)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   11.3051(3)
_cell_length_b                   6.2777(2)
_cell_length_c                   16.4774(4)
_cell_measurement_reflns_used    9054
_cell_measurement_temperature    100.(2)
_cell_measurement_theta_max      72.2356
_cell_measurement_theta_min      2.7030
_cell_volume                     1160.18(6)
_computing_cell_refinement       'SAINT V8.38A (Bruker AXS Inc., 2017)'
_computing_data_collection       'Bruker Instrument Service vV6.2.9'
_computing_data_reduction        'SAINT V8.38A (Bruker AXS Inc., 2017)'
_computing_structure_refinement  'SHELXL-2017/1 (Sheldrick, 2017)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100.(2)
_diffrn_detector_area_resol_mean 7.3910
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker D8 QUEST PHOTON II'
_diffrn_radiation_monochromator  'Helixos MX multilayer Optic'
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0321
_diffrn_reflns_av_unetI/netI     0.0250
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            21368
_diffrn_reflns_theta_full        72.29
_diffrn_reflns_theta_max         72.29
_diffrn_reflns_theta_min         2.70
_diffrn_source                   'Ius Diamond'
_diffrn_source_type              Microfocus
_exptl_absorpt_coefficient_mu    2.516
_exptl_absorpt_correction_T_max  0.93
_exptl_absorpt_correction_T_min  0.34
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 - Bruker AXS area detector scaling and absorption correction
;
_exptl_crystal_colour            'clear light yellow'
_exptl_crystal_density_diffrn    1.453
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             528
_exptl_crystal_size_max          0.480
_exptl_crystal_size_mid          0.050
_exptl_crystal_size_min          0.030
_refine_diff_density_max         1.177
_refine_diff_density_min         -0.305
_refine_ls_abs_structure_details
;

Flack x determined using 1861 quotients [(I+)-(I-)]/[(I+)+(I-)]
(Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.031(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     296
_refine_ls_number_reflns         4464
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.049
_refine_ls_R_factor_all          0.0404
_refine_ls_R_factor_gt           0.0398
_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^)+(0.0645P)^2^+0.7997P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1087
_refine_ls_wR_factor_ref         0.1094
_reflns_number_gt                4381
_reflns_number_total             4464
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d4cc03674c2.cif
_cod_data_source_block           glm114
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_absorpt_correction_type' value 'Multi-Scan' was
changed to 'multi-scan' in accordance with the
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 8170 2020-07-09 18:12:32Z antanas 

 Adding full bibliography for 7133635--7133636.cif.
;
_cod_database_code               7133635
_shelx_res_checksum              79542
_shelx_hkl_checksum              43381