α- and γ-Polymorphs of Dimethyl 9-Chloromethyl-9,10-dihydro-9,10-ethenoanthracene-11,12-dicarboxylate
Jones, R.; Rettig, S. J.; Trotter, J.; Acta Crystallographica Section C 51 (1995) 2392–2395; doi:10.1107/S0108270195005336

data_2004128
_publ_section_title
;
 \a- and \g-Polymorphs of Dimethyl
 9-Chloromethyl-9,10-dihydro-9,10-ethenoanthracene-11,12-dicarboxylate
;
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              2392
_journal_page_last               2395
_journal_paper_doi               10.1107/S0108270195005336
_journal_volume                  51
_journal_year                    1995
_chemical_formula_moiety         'C21 H17 Cl O4'
_chemical_formula_sum            'C21 H17 Cl O4'
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_chemical_melting_point          448.0(10)
_chemical_name_systematic
;
Dimethyl 9-chloromethyl-9,10-dihydro-9,10-ethenoanthracene-
11,12-dicarboxylate
;
_space_group_IT_number           4
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_cell_angle_alpha                90
_cell_angle_beta                 98.33(1)
_cell_angle_gamma                90
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_cell_length_b                   8.863(2)
_cell_length_c                   11.745(1)
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_cell_measurement_theta_min      23
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_computing_cell_refinement
' TEXSAN (Molecular Structure Corporation, 1985)'
_computing_data_collection
' TEXSAN (Molecular Structure Corporation, 1985)'
_computing_data_reduction
' TEXSAN (Molecular Structure Corporation, 1985)'
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' TEXSAN (Molecular Structure Corporation, 1985)'
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' TEXSAN (Molecular Structure Corporation, 1985)'
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' TEXSAN (Molecular Structure Corporation, 1985)'
_diffrn_ambient_temperature      294
_diffrn_measurement_device       'Rigaku AFC6S'
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_exptl_absorpt_correction_type   ' empirical (DIFABS; Walker \& Stuart, 1983)'
_exptl_crystal_colour            colourless
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' TEXSAN (Molecular Structure Corporation, 1985)'
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_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '447-449K' was changed to '448.0(10)'
- the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value '1/\s^2^(F)' was changed to
'calc'. New tag '_refine_ls_weighting_details' was created. The value
of the new tag was set to 'w = 1/\s^2^(F)'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        889.3(5)
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               2004128