One-pot [1+1+1] synthesis of dithieno[2,3-b:3',2'-d]thiophene (DTT) and their functionalized derivatives for organic thin-film transistors.
Chen, Ming-Chou; Chiang, Yen-Ju; Kim, Choongik; Guo, Yue-Jhih; Chen, Sheng-Yu; Liang, You-Jhih; Huang, Yu-Wen; Hu, Tarng-Shiang; Lee, Gene-Hsiang; Facchetti, Antonio; Marks, Tobin J; Chemical communications (Cambridge, England) 34 (2009) 1846–1848; doi:10.1039/b820621j

data_7104295
_publ_section_title
;
 One-pot [1+1+1] synthesis of dithieno[2,3-b:3',2'-d]thiophene (DTT)
 and their functionalized derivatives for organic thin-film
 transistors.
;
_journal_issue                   14
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              1846
_journal_page_last               1848
_journal_paper_doi               10.1039/b820621j
_journal_volume                  34
_journal_year                    2009
_chemical_formula_sum            'C22 H12 O2 S3'
_chemical_formula_weight         404.50
_space_group_IT_number           62
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_computing_molecular_graphics    'Bruker SHELXTL'
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_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'NONIUS KappaCCD'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
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_exptl_crystal_density_meas      ?
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_exptl_crystal_description       plate
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_refine_ls_extinction_coef       0.037(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
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_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^)+(0.0699P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1052
_refine_ls_wR_factor_ref         0.1353
_reflns_number_gt                1372
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_cod_data_source_file            b820621j.txt
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_cod_depositor_comments
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The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not_measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      Pnma
_cod_database_code               7104295