Base catalysed synthesis of thiochromans and azo-linked chromenes using allenylphosphonates.
Phani Pavan, M.; Nagarjuna Reddy, M.; Bhuvan Kumar, N. N.; Kumara Swamy, K. C.; Organic & biomolecular chemistry 10 (2012) 8113–8118; doi:10.1039/c2ob26285a

data_7152670
_publ_section_title
;
 Base catalysed synthesis of thiochromans and azo-linked chromenes using
 allenylphosphonates.
;
_journal_issue                   40
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              8113
_journal_page_last               8118
_journal_paper_doi               10.1039/c2ob26285a
_journal_volume                  10
_journal_year                    2012
_chemical_formula_sum            'C21 H23 O4 P S'
_chemical_formula_weight         402.42
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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                 93.34(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.127(2)
_cell_length_b                   17.133(3)
_cell_length_c                   12.580(3)
_cell_measurement_reflns_used    2163
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      34.7799
_cell_measurement_theta_min      3.2099
_cell_volume                     1963.8(7)
_computing_cell_refinement       'CrysAlisPro, Oxford Diffraction Ltd.'
_computing_data_collection       'CrysAlisPro, Oxford Diffraction Ltd.'
_computing_data_reduction        'CrysAlisPro, Oxford Diffraction Ltd.'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_detector_area_resol_mean none
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Xcalibur, Eos, Gemini'
_diffrn_measurement_method       '\w scans'
_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  0.0470
_diffrn_reflns_av_sigmaI/netI    0.0667
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            8636
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.24
_diffrn_standards_interval_count 'not applicable'
_diffrn_standards_interval_time  'not applicable'
_diffrn_standards_number         'not applicable'
_exptl_absorpt_coefficient_mu    0.270
_exptl_absorpt_correction_T_max  0.9683
_exptl_absorpt_correction_T_min  0.9184
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrysAlisPro, Oxford Diffraction Ltd.'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.361
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             848
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.317
_refine_diff_density_min         -0.233
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.871
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     250
_refine_ls_number_reflns         3436
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.871
_refine_ls_R_factor_all          0.0822
_refine_ls_R_factor_gt           0.0415
_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^)+(0.0502P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0871
_refine_ls_wR_factor_ref         0.0963
_reflns_number_gt                2054
_reflns_number_total             3436
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ob26285a.txt
_cod_data_source_block           kck9
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_cell_volume        1963.9(7)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7152670