Michael, Michael-aldol and Michael-Michael reactions of enolate equivalents of butane-2,3-diacetal protected glycolic acid derivatives.
Ley, Steven V.; Dixon, Darren J.; Guy, Richard T.; Rodríguez, Félix; Sheppard, Tom D.; Organic & biomolecular chemistry 3 (2005) 4095–4107; doi:10.1039/b512410g

data_7150295
_publ_section_title
;
 Michael, Michael-aldol and Michael-Michael reactions of enolate
 equivalents of butane-2,3-diacetal protected glycolic acid
 derivatives.
;
_journal_issue                   22
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              4095
_journal_page_last               4107
_journal_paper_doi               10.1039/b512410g
_journal_volume                  3
_journal_year                    2005
_chemical_formula_sum            'C21.5 H28 Cl N O9'
_chemical_formula_weight         479.90
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                113.501(2)
_cell_angle_beta                 93.419(3)
_cell_angle_gamma                92.824(5)
_cell_formula_units_Z            2
_cell_length_a                   6.8253(2)
_cell_length_b                   12.1456(6)
_cell_length_c                   15.2031(12)
_cell_measurement_reflns_used    8210
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      1.00
_cell_volume                     1150.02(11)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius B.V. 1998)'
_computing_data_reduction
;
HKL Denzo and Scalepack (Otwinowski & Minor 1997)
;
_computing_publication_material  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick 1990)'
_diffrn_ambient_temperature      180(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'Thin slice \w and \f scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0457
_diffrn_reflns_av_sigmaI/netI    0.0645
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            13386
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         3.53
_exptl_absorpt_coefficient_mu    0.218
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.386
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             506
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.326
_refine_diff_density_min         -0.439
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     307
_refine_ls_number_reflns         5233
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0932
_refine_ls_R_factor_gt           0.0541
_refine_ls_shift/su_max          0.007
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0483P)^2^+0.4679P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1142
_refine_ls_wR_factor_ref         0.1310
_reflns_number_gt                3525
_reflns_number_total             5233
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b512410g.txt
_cod_data_source_block           sl0022
_cod_original_sg_symbol_H-M      P-1
_cod_original_formula_sum        'C21.50 H28 Cl N O9'
_cod_database_code               7150295