Synthesis of C-ring substituted xanthones from the [4 + 2] cycloaddition reaction of vinylchromones and acyclic enamines
Kelkar, Avijit S.; Letcher, Roy M.; Cheung, Kung-Kai; Chiu, Kwei-Fung; Brown, Geoffrey D.; Journal of the Chemical Society, Perkin Transactions 1  (2000) 3732–; doi:10.1039/b004422i

data_7213392
_publ_contact_author
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    ENTER NAME
 ENTER
ADDRESS
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_publ_section_title
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 Synthesis of C-ring substituted xanthones from the [4&#x2005;+&#x2005;2]
 cycloaddition reaction of vinylchromones and acyclic enamines
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_journal_issue                   22
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 1'
_journal_page_first              3732
_journal_paper_doi               10.1039/b004422i
_journal_year                    2000
_chemical_formula_moiety         'C21 H18 O2'
_chemical_formula_sum            'C21 H18 O2'
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_space_group_IT_number           14
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_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2yn'
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_audit_creation_date             'Fri Jan  7 13:04:40 2000'
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_cell_angle_alpha                90
_cell_angle_beta                 107.88(2)
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_cell_formula_units_Z            4
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_computing_data_collection       'MAR Data Collection Software &DENZO'
_computing_data_reduction        teXsan
_computing_publication_material  teXsan
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_diffrn_radiation_detector       'Imaging Plate'
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_exptl_absorpt_coefficient_mu    0.080
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_refine_ls_shift/esd_max         0.0400
_refine_ls_structure_factor_coef F
_refine_ls_weighting_scheme      sigma
_refine_ls_wR_factor_obs         0.0968
_reflns_number_observed          1661
_reflns_number_total             2946
_reflns_observed_criterion       3.00
_cod_data_source_file            b004422isup1.cif
_cod_data_source_block           ip572_C21H18O2_23_09_1998
_cod_depositor_comments
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The following automatic conversions were performed:

data name '_atom_type_scat_dispersion_image' was replaced with
'_atom_type_scat_dispersion_imag' as specified in the replacement
file 'data/replacement-values/replacement_tags.lst'.

Automatic conversion script
Id: cif_correct_tags 9268 2022-04-12 08:56:07Z antanas 
;
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7213392