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_7158962
_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      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   geom
_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                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.7694(2)
_cell_length_b                   14.5049(4)
_cell_length_c                   16.9906(5)
_cell_measurement_reflns_used    9934
_cell_measurement_temperature    170(2)
_cell_measurement_theta_max      54.86
_cell_measurement_theta_min      8.29
_cell_volume                     1668.30(8)
_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      170.02
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.0476
_diffrn_reflns_av_unetI/netI     0.0254
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            18448
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        53.594
_diffrn_reflns_theta_max         54.859
_diffrn_reflns_theta_min         3.486
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.606
_exptl_absorpt_correction_T_max  0.7508
_exptl_absorpt_correction_T_min  0.5808
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1510 before and 0.0526 after correction. The Ratio of minimum to maximum transmission is 0.7556. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.499
_exptl_crystal_description       block
_exptl_crystal_F_000             800
_exptl_crystal_size_max          0.08
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.238
_refine_diff_density_min         -0.161
_refine_diff_density_rms         0.037
_refine_ls_abs_structure_details
;
 Flack x determined using 1284 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.01(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     248
_refine_ls_number_reflns         3173
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0266
_refine_ls_R_factor_gt           0.0258
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0350P)^2^+0.3340P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0661
_refine_ls_wR_factor_ref         0.0665
_reflns_Friedel_coverage         0.721
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                3098
_reflns_number_total             3173
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d2ob01748b2.cif
_cod_data_source_block           mj19104_0m
_cod_database_code               7158962
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_max   0.982
_shelx_estimated_absorpt_t_min   0.953
_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:
 C2(H2), C4(H4), C10(H10), C11(H11), C13(H13), C14(H14)
2.b Secondary CH2 refined with riding coordinates:
 C3(H3A,H3B), C6(H6A,H6B), 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:
 O1(H1), O7(H7)
;
_shelx_res_checksum              99357
_olex2_submission_special_instructions 'No special instructions were received'