Graphene Oxide Nanosheets: A Highly Efficient and Reusable Carbocatalyst Catalyzes the Michael-Cyclization Reactions of 4-Hydroxycoumarins, 4-Hydroxypyrone and 4-Hydroxy-1-methylquinolinone With Chalcone Derivatives in Aqueous Media
Das, Asish R.; Kausar, Nazia; Ghosh, Partha Pratim; Pal, Gargi; RSC Adv.  (2015) –; doi:10.1039/C5RA08776G

data_7220907
_publ_section_title
;
 Graphene Oxide Nanosheets: A Highly Efficient and Reusable Carbocatalyst
 Catalyzes the Michael-Cyclization Reactions of 4-Hydroxycoumarins,
 4-Hydroxypyrone and 4-Hydroxy-1-methylquinolinone With Chalcone
 Derivatives in Aqueous Media
;
_journal_name_full               'RSC Adv.'
_journal_paper_doi               10.1039/C5RA08776G
_journal_year                    2015
_chemical_formula_sum            'C25 H18 N2 O4'
_chemical_formula_weight         410.41
_space_group_IT_number           2
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2015-05-02 deposited with the CCDC.
2015-06-25 downloaded from the CCDC.
;
_cell_angle_alpha                78.303(2)
_cell_angle_beta                 80.056(2)
_cell_angle_gamma                75.760(2)
_cell_formula_units_Z            2
_cell_length_a                   7.9732(6)
_cell_length_b                   11.0621(8)
_cell_length_c                   11.7442(8)
_cell_measurement_temperature    296(2)
_cell_volume                     974.90(12)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.965
_diffrn_measured_fraction_theta_max 0.965
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0166
_diffrn_reflns_av_sigmaI/netI    0.0177
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            11951
_diffrn_reflns_theta_full        26.47
_diffrn_reflns_theta_max         26.47
_diffrn_reflns_theta_min         1.79
_exptl_absorpt_coefficient_mu    0.096
_exptl_crystal_density_diffrn    1.398
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             428
_refine_diff_density_max         0.187
_refine_diff_density_min         -0.195
_refine_diff_density_rms         0.036
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     281
_refine_ls_number_reflns         3872
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.0515
_refine_ls_R_factor_gt           0.0422
_refine_ls_shift/su_max          0.008
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0761P)^2^+0.1625P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1258
_refine_ls_wR_factor_ref         0.1348
_reflns_number_gt                3151
_reflns_number_total             3872
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c5ra08776g1.cif
_cod_data_source_block           nk_ard_n_met_0m
_cod_database_code               7220907