Cephalotane-type C20 Diterpenoids from Cephalotaxus fortunei var. alpina
Ge, Zhan-Peng; Zhou, Bin; Zimbres, Flavia M.; Haney, Reagan S.; Liu, Qun-Fang; Wu, Yan; Cassera , Maria B.; Zhao, Jin-Xin; Yue, Jian-Min; Organic & Biomolecular Chemistry  (2022) –; doi:10.1039/D2OB01748B

data_7158959
_publ_section_title
;
 Cephalotane-type C20 Diterpenoids from Cephalotaxus fortunei var. alpina
;
_journal_name_full               'Organic &amp; Biomolecular Chemistry'
_journal_paper_doi               10.1039/D2OB01748B
_journal_year                    2022
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C20 H24 O7'
_chemical_formula_sum            'C20 H24 O7'
_chemical_formula_weight         376.39
_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   mixed
_atom_sites_solution_primary     dual
_audit_creation_date             2019-02-26
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2022-09-04 deposited with the CCDC.	2022-10-27 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 91.5960(10)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   6.5730(2)
_cell_length_b                   14.9361(4)
_cell_length_c                   8.6462(2)
_cell_measurement_reflns_used    3757
_cell_measurement_temperature    170(2)
_cell_measurement_theta_max      54.92
_cell_measurement_theta_min      9.30
_cell_volume                     848.51(4)
_computing_cell_refinement       'SAINT v8.37A (Bruker, 2015)'
_computing_data_reduction        'SAINT v8.37A (Bruker, 2015)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      169.97
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           GaK\a
_diffrn_radiation_wavelength     1.34139
_diffrn_reflns_av_R_equivalents  0.0413
_diffrn_reflns_av_unetI/netI     0.0363
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            10525
_diffrn_reflns_point_group_measured_fraction_full 0.994
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        53.594
_diffrn_reflns_theta_max         54.899
_diffrn_reflns_theta_min         4.451
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.596
_exptl_absorpt_correction_T_max  0.7508
_exptl_absorpt_correction_T_min  0.5846
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1608 before and 0.0588 after correction. The Ratio of minimum to maximum transmission is 0.7786. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.473
_exptl_crystal_description       block
_exptl_crystal_F_000             400
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.199
_refine_diff_density_min         -0.176
_refine_diff_density_rms         0.037
_refine_ls_abs_structure_details
;
 Flack x determined using 1367 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.07(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     251
_refine_ls_number_reflns         3199
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0320
_refine_ls_R_factor_gt           0.0295
_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^)+(0.0414P)^2^+0.0656P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0724
_refine_ls_wR_factor_ref         0.0744
_reflns_Friedel_coverage         0.914
_reflns_Friedel_fraction_full    0.991
_reflns_Friedel_fraction_max     0.990
_reflns_number_gt                3039
_reflns_number_total             3199
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d2ob01748b2.cif
_cod_data_source_block           mj19103_0m
_cod_database_code               7158959
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_max   0.943
_shelx_estimated_absorpt_t_min   0.916
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups, All O(H) groups
2.a Ternary CH refined with riding coordinates:
 C1(H1), C2(H2), C4(H4A), C6(H6), C10(H10), C11(H11), C13(H13), C14(H14)
2.b Secondary CH2 refined with riding coordinates:
 C3(H3A,H3B), C7(H7A,H7B), C15(H15A,H15B), C20(H20A,H20B)
2.c Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C), C19(H19A,H19B,H19C)
2.d Idealised tetrahedral OH refined as rotating group:
 O7(H7)
;
_shelx_res_checksum              19324
_olex2_submission_special_instructions 'No special instructions were received'