Two Enantiomeric Pairs of Meroterpenoids from Rhododendron capitatum.
Liao, Hai-Bing; Lei, Chun; Gao, Li-Xin; Li, Jing-Ya; Li, Jia; Hou, Ai-Jun; Organic letters 17 (2015) 5040–5043; doi:10.1021/acs.orglett.5b02515

data_1555337
_publ_section_title
;
 Two Enantiomeric Pairs of Meroterpenoids from Rhododendron capitatum.
;
_journal_issue                   20
_journal_name_full               'Organic letters'
_journal_page_first              5040
_journal_page_last               5043
_journal_paper_doi               10.1021/acs.orglett.5b02515
_journal_volume                  17
_journal_year                    2015
_chemical_absolute_configuration ad
_chemical_formula_sum            'C17 H20 O3'
_chemical_formula_weight         272.33
_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_creation_method           SHELXL-2013
_cell_angle_alpha                90
_cell_angle_beta                 101.1260(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.30180(10)
_cell_length_b                   14.7835(2)
_cell_length_c                   12.3636(2)
_cell_measurement_reflns_used    6943
_cell_measurement_temperature    140(2)
_cell_measurement_theta_max      69.20
_cell_measurement_theta_min      3.64
_cell_volume                     1488.86(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      140(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.966
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0319
_diffrn_reflns_av_unetI/netI     0.0390
_diffrn_reflns_Laue_measured_fraction_full 0.988
_diffrn_reflns_Laue_measured_fraction_max 0.966
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            10175
_diffrn_reflns_point_group_measured_fraction_full 0.851
_diffrn_reflns_point_group_measured_fraction_max 0.828
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         69.705
_diffrn_reflns_theta_min         3.643
_exptl_absorpt_coefficient_mu    0.659
_exptl_absorpt_correction_T_max  0.7533
_exptl_absorpt_correction_T_min  0.5938
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.215
_exptl_crystal_description       block
_exptl_crystal_F_000             584
_exptl_crystal_size_max          0.250
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.150
_refine_diff_density_max         0.187
_refine_diff_density_min         -0.189
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details
; 
 Flack x determined using 1760 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons and Flack (2004), Acta Cryst. A60, s61). 
;
_refine_ls_abs_structure_Flack   -0.03(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.067
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     369
_refine_ls_number_reflns         4649
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.067
_refine_ls_R_factor_all          0.0326
_refine_ls_R_factor_gt           0.0322
_refine_ls_shift/su_max          0.012
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0593P)^2^+0.1029P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0895
_refine_ls_wR_factor_ref         0.0900
_reflns_Friedel_coverage         0.646
_reflns_Friedel_fraction_full    0.703
_reflns_Friedel_fraction_max     0.679
_reflns_number_gt                4565
_reflns_number_total             4649
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol5b02515_si_002.cif
_cod_data_source_block           cu_dm13759_0m
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               1555337
_shelx_estimated_absorpt_t_min   0.853
_shelx_estimated_absorpt_t_max   0.908
_shelxl_version_number           2013-4
_shelx_res_checksum              83120
_shelx_hkl_checksum              38356