Thermal and Lewis acid Promoted Intramolecular Diels-Alder Reaction of Furanose Tethered 1,3,9-Decatriene Systems: A Synthetic and Computational Investigation
Kalmode, Hanuman; Maity, Dilip Kumar; Bhate, Prakash; RSC Adv.  (2016) –; doi:10.1039/C6RA10456H

data_7225751
_publ_section_title
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 Thermal and Lewis acid Promoted Intramolecular Diels-Alder Reaction of
 Furanose Tethered 1,3,9-Decatriene Systems: A Synthetic and Computational
 Investigation
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_journal_name_full               'RSC Adv.'
_journal_paper_doi               10.1039/C6RA10456H
_journal_year                    2016
_chemical_formula_sum            'C15 H20 O5'
_chemical_formula_weight         280.31
_chemical_melting_point          332.0(10)
_chemical_name_systematic
'(4aR,6aS,6bR,9aR,10aR,10bS)-4a,8,8-trimethyl-4,4a,6b,9a,10a,10b-hexahydro-3H-[1,3]dioxolo[4',5':4,5]furo[3,2-c] isochromen-5(6aH)-one'
_space_group_IT_number           19
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
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2014-11-05 deposited with the CCDC.
2016-06-16 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.0114(4)
_cell_length_b                   8.5390(5)
_cell_length_c                   23.6600(13)
_cell_measurement_temperature    296(2)
_cell_volume                     1416.53(14)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.952
_diffrn_measured_fraction_theta_max 0.952
_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  0.0296
_diffrn_reflns_av_sigmaI/netI    0.0381
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            5635
_diffrn_reflns_theta_full        28.29
_diffrn_reflns_theta_max         28.29
_diffrn_reflns_theta_min         1.72
_exptl_absorpt_coefficient_mu    0.098
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.314
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             600
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: Ethanol'
_refine_diff_density_max         0.216
_refine_diff_density_min         -0.205
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.7(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     184
_refine_ls_number_reflns         3328
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.042
_refine_ls_R_factor_all          0.0382
_refine_ls_R_factor_gt           0.0354
_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^)+(0.0447P)^2^+0.2035P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0882
_refine_ls_wR_factor_ref         0.0905
_reflns_number_gt                3113
_reflns_number_total             3328
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6ra10456h2.cif
_cod_data_source_block           tr1
_cod_depositor_comments
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The following automatic conversions were performed:

'_chemical_melting_point' value '331-333' was changed to '332.0(10)'
- the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 4268 2015-11-12 08:31:59Z antanas 
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_cod_database_code               7225751