Unprecedented formation of 3-(tetrahydrofuran-2-yl)-4H-chromen-4-one in the reaction between 3,3a-dihydro-9H-furo[3,4-b]chromen-9-one with malononitrile
Liu, Jie-Jie; Cheng, Liang; Huang, Hong-Yan; Wei, Feng; Wang, Dong; Liu, Li; Org. Biomol. Chem.  (2017) –; doi:10.1039/C7OB00904F

data_7155656
_publ_section_title
;
 Unprecedented formation of 3-(tetrahydrofuran-2-yl)-4H-chromen-4-one in
 the reaction between 3,3a-dihydro-9H-furo[3,4-b]chromen-9-one with
 malononitrile
;
_journal_name_full               'Org. Biomol. Chem.'
_journal_paper_doi               10.1039/C7OB00904F
_journal_year                    2017
_chemical_formula_moiety         'C20 H20 N2 O5'
_chemical_formula_sum            'C20 H20 N2 O5'
_chemical_formula_weight         368.38
_space_group_crystal_system      orthorhombic
_space_group_IT_number           61
_space_group_name_Hall           '-P 2ac 2ab'
_space_group_name_H-M_alt        'P b c a'
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2017-01-13
_audit_creation_method
;
Olex2 1.2
(compiled 2016.11.30 svn.r3356 for OlexSys, GUI svn.r5289)
;
_audit_update_record
;
2017-05-23 deposited with the CCDC.
2017-05-25 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   12.7770(17)
_cell_length_b                   16.254(2)
_cell_length_c                   17.725(2)
_cell_measurement_reflns_used    8855
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.4711
_cell_measurement_theta_min      1.5938
_cell_volume                     3681.1(8)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2007)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'CIFTAB (Sheldrick, 2013)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'MM007-HF CCD(Saturn 724+)'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0434
_diffrn_reflns_av_unetI/netI     0.0401
_diffrn_reflns_Laue_measured_fraction_full 0.990
_diffrn_reflns_Laue_measured_fraction_max 0.987
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            12304
_diffrn_reflns_point_group_measured_fraction_full 0.990
_diffrn_reflns_point_group_measured_fraction_max 0.987
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.473
_diffrn_reflns_theta_min         2.331
_diffrn_source                   'Rotating Anode'
_exptl_absorpt_coefficient_mu    0.097
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.7740
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2007)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.329
_exptl_crystal_description       block
_exptl_crystal_F_000             1552
_exptl_crystal_size_max          0.41
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.268
_refine_diff_density_min         -0.247
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.138
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     247
_refine_ls_number_reflns         4166
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.138
_refine_ls_R_factor_all          0.0675
_refine_ls_R_factor_gt           0.0594
_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^)+(0.0451P)^2^+2.2715P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1268
_refine_ls_wR_factor_ref         0.1323
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3754
_reflns_number_total             4166
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7ob00904f2.cif
_cod_data_source_block           mx5525
_cod_original_cell_volume        3680.9(8)
_cod_database_code               7155656
_shelx_shelxl_version_number     2014/7
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups, All N(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C10(H10), C15(H15)
2.b Secondary CH2 refined with riding coordinates:
 C19(H19A,H19B)
2.c Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C4(H4), C5(H5), C9(H9)
2.d X=CH2 refined with riding coordinates:
 N1(H1A,H1B)
2.e Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C), C17(H17A,H17B,H17C), C20(H20A,H20B,H20C)
;
_shelx_res_checksum              87954
_olex2_submission_special_instructions 'No special instructions were received'