Synthèses et structures de deux acides 5,6-dihydro-6-[aryl]-4-{2-[aryl]-éthényl}-2-oxo-2<i>H</i>-pyrane-3-carboxylique
Valla, Alain; Giraud, Michel; Ginderow, Daria; Acta Crystallographica Section C 50 (1994) 1314–1318; doi:10.1107/S0108270194001423

data_2009991
_publ_section_title
;Synth\`eses et structures de deux acides
 5,6-dihydro-6-[aryl]-4-{2-[aryl]-\'eth\'enyl}-2-oxo-2<i>H</i>-pyrane-3-carboxylique
;
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1314
_journal_page_last               1318
_journal_paper_doi               10.1107/S0108270194001423
_journal_volume                  50
_journal_year                    1994
_chemical_formula_moiety         'C22 H20 O6'
_chemical_formula_sum            'C22 H20 O6'
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_diffrn_measurement_device       'Philips PW1100'
_diffrn_measurement_method       "'flying stepscan' (Logiciel Philips)"
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'tube \`a rayons X'
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_diffrn_reflns_limit_k_max       9
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_diffrn_reflns_theta_min         2.18
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_exptl_absorpt_correction_type   'pas de correction d'absorption'
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_refine_ls_extinction_method     'pas de correction d'extinction'
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_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           compl\`ete
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_refine_ls_number_reflns         1303
_refine_ls_number_restraints     0
_refine_ls_R_factor_obs          0.041
_refine_ls_shift/esd_max         0.093
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details     w=1
_refine_ls_weighting_scheme      calc
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_reflns_observed_criterion
;F>5.48 (\'echelle absolue)
0.090<Sin\q/\l<0.540 \%A^-1^
;
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;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'w=1' was changed to 'calc'. New
tag '_refine_ls_weighting_details' was created. The value of the new
tag was set to 'w=1'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1880.41
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2009991