Heterogeneous ditopic ZnFe2O4 catalyzed synthesis of 4H-pyrans: further conversion to 1,4-DHPs and report of functional group interconversion from amide to ester
Das, Paramita; Dutta, Arghya; Bhaumik, Asim; Mukhopadhyay, Chhanda; Green Chemistry 16 (2014) 1426–; doi:10.1039/c3gc42095g

data_7214118
_publ_section_title
;
 Heterogeneous ditopic ZnFe2O4 catalyzed synthesis of 4H-pyrans: further
 conversion to 1,4-DHPs and report of functional group interconversion
 from amide to ester
;
_journal_issue                   3
_journal_name_full               'Green Chemistry'
_journal_page_first              1426
_journal_paper_doi               10.1039/c3gc42095g
_journal_volume                  16
_journal_year                    2014
_chemical_formula_sum            'C20 H14 N2 O3'
_chemical_formula_weight         330.33
_space_group_IT_number           14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 104.8350(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.0629(11)
_cell_length_b                   11.2174(14)
_cell_length_c                   16.215(2)
_cell_measurement_temperature    296(2)
_cell_volume                     1593.5(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0199
_diffrn_reflns_av_sigmaI/netI    0.0187
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            10656
_diffrn_reflns_theta_full        24.66
_diffrn_reflns_theta_max         24.66
_diffrn_reflns_theta_min         2.23
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_T_max  0.994
_exptl_absorpt_correction_T_min  0.992
_exptl_absorpt_correction_type   empirical
_exptl_crystal_density_diffrn    1.377
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             688
_exptl_crystal_size_max          0.09
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.184
_refine_diff_density_min         -0.125
_refine_diff_density_rms         0.029
_refine_ls_extinction_coef       0.0075(17)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.843
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     234
_refine_ls_number_reflns         2687
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.843
_refine_ls_R_factor_all          0.0437
_refine_ls_R_factor_gt           0.0356
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0874P)^2^+0.4205P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1085
_refine_ls_wR_factor_ref         0.1196
_reflns_number_gt                2238
_reflns_number_total             2687
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3gc42095g.txt
_cod_data_source_block           a
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7214118