C,O-Dialkylation of Meldrum's Acid: Synthesis and Reactivity of 1,3,7,7-Tetramethyl-4H,10H-6,8,9-trioxa-2-thiabenz[f]azulen-5-one
Chad A. Snyder; John P. Selegue; Eniolami Dosunmu; Nathan C. Tice; Sean Parkin; Journal of Organic Chemistry 68 (2003) 7455–7459; doi:10.1021/jo034708i

data_4022503
_publ_section_title
;
 C,O-Dialkylation of Meldrum's Acid: Synthesis and Reactivity of
 1,3,7,7-Tetramethyl-4H,10H-6,8,9-trioxa-2-thiabenz[f]azulen-5-one
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              7455
_journal_page_last               7459
_journal_paper_doi               10.1021/jo034708i
_journal_volume                  68
_journal_year                    2003
_chemical_compound_source        'synthesized by Chad A. Snyder'
_chemical_formula_moiety         'C15 H20 O5 S'
_chemical_formula_sum            'C15 H20 O5 S'
_chemical_formula_weight         312.37
_chemical_melting_point          391.6(5)
_chemical_name_systematic
; 
5-(4-methoxymethyl-2,5-dimethylthiophen-3-ylmethyl)-2,2
-dimethyl[1,3]dioxane-4,6-dione 
;
_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                 105.410(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.5470(5)
_cell_length_b                   9.8590(5)
_cell_length_c                   14.0290(6)
_cell_measurement_reflns_used    19210
_cell_measurement_temperature    90.0(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      1.00
_cell_volume                     1539.67(12)
_computing_cell_refinement       'SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1998)'
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'XP in Siemens SHELXTL (Sheldrick, 1994)'
_computing_publication_material
;
SHELX97-2 (Sheldrick, 1997) and local procedures
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      90.0(2)
_diffrn_detector_area_resol_mean 18
_diffrn_measured_fraction_theta_full .999
_diffrn_measured_fraction_theta_max .999
_diffrn_measurement_device_type  'Nonius KappaCCD diffractometer'
_diffrn_measurement_method       '\w scans at fixed \c = 55\%'
_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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0475
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            3532
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         1.83
_diffrn_standards_decay_%        <1
_exptl_absorpt_coefficient_mu    0.228
_exptl_absorpt_correction_T_max  0.9451
_exptl_absorpt_correction_T_min  0.9243
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Scalepack (Otwinowski & Minor, 1997)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.348
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             664
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         .312
_refine_diff_density_min         -.245
_refine_diff_density_rms         .053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.076
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     195
_refine_ls_number_reflns         3532
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.076
_refine_ls_R_factor_all          0.0675
_refine_ls_R_factor_gt           0.0428
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0330P)^2^+0.8097P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0837
_refine_ls_wR_factor_ref         0.0972
_reflns_number_gt                2832
_reflns_number_total             3532
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo034708isi20030522_123246.cif
_cod_data_source_block           k02091
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '118-119 deg C' was changed to
'391.6(5)' - it was converted from degrees Celsius(C) to Kelvins(K),
the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4022503