data_2005135
_journal_name_full  'Acta Crystallographica'
_journal_year      1996
_journal_volume    'C52'
_journal_page_first     1722
_journal_page_last     1725
_publ_section_title
;
3-tert-Butyl-4-methyl-2-phenyl-3-(trimethylsilyloxy)oxetane
and 2-(2-Benzyloxyphenyl)-3-tert-butyl-3-(trimethylsilyloxy)oxetane
;
_chemical_formula_sum     'C23 H32 O3 Si'
_chemical_formula_weight     384.58
_symmetry_cell_setting    'monoclinic'
loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, y+1/2, -z+1/2'
'-x, -y, -z'
'x, -y-1/2, z-1/2'
_symmetry_space_group_name_H-M     'P 21/c'
_cell_length_a     14.701(2)
_cell_length_b     10.1530(10)
_cell_length_c     15.420(2)
_cell_angle_alpha     90.00
_cell_angle_beta     96.260(10)
_cell_angle_gamma     90.00
_cell_volume     2287.9(5)
_cell_formula_units_Z     4
_exptl_crystal_density_diffrn     1.117
_cell_measurement_temperature     293(2)
loop_
_atom_site_label
_atom_site_occupancy
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Si20 1  .37904(4)  .18526(6)  .72347(4)  .0570(2)
O1 1  .11600(10)  .3839(2)  .63835(9)  .0628(4)
O11 1  .10889(9)  .1254(2)  .84549(8)  .0487(3)
O19 1  .28860(8)  .2490(2)  .75901(8)  .0481(4)
C2 1  .12451(13)  .3032(2)  .71665(12)  .0464(5)
H2 1  .08512(13)  .3348(2)  .75960(12)  .056
C3 1  .22518(13)  .3508(2)  .73805(12)  .0457(5)
C4 1  .2139(2)  .3994(2)  .64351(14)  .0623(6)
H4A 1  .2331(2)  .4900(2)  .63730(14)  .075
H4B 1  .2424(2)  .3423(2)  .60389(14)  .075
C5 1  .10917(12)  .1597(2)  .69613(12)  .0443(5)
C6 1  .10309(12)  .0703(2)  .76388(11)  .0417(4)
C7 1  .09038(13)  -.0627(2)  .74705(13)  .0495(5)
H7 1  .08821(13) -0.1219(2)  .79279(13)  .059
C8 1  .08098(14) -0.1067(2)  .66204(14)  .0570(5)
H8 1  .07206(14) -0.1959(2)  .65042(14)  .068
C9 1  .0847(2)  -.0194(2)  .59407(14)  .0610(6)
H9 1  .0774(2)  -.0492(2)  .53671(14)  .073
C10 1  .09925(14)  .1121(2)  .61167(13)  .0550(5)
H10 1  .10250(14)  .1705(2)  .56562(13)  .066
C12 1  .09630(14)  .0415(2)  .91726(12)  .0504(5)
H12A 1  .04349(14)  -.0143(2)  .90154(12)  .060
H12B 1  .08333(14)  .0953(2)  .96639(12)  .060
C13 1  .17753(14)  -.0442(2)  .94493(11)  .0471(5)
C14 1  .2644(2)  -.0094(2)  .9289(2)  .0624(6)
H14 1  .2733(2)  .0662(2)  .8969(2)  .075
C15 1  .3384(2)  -.0854(3)  .9598(2)  .0784(7)
H15 1  .3970(2)  -.0605(3)  .9489(2)  .094
C16 1  .3262(2) -0.1978(3) 1.0066(2)  .0771(7)
H16 1  .3763(2) -0.2493(3) 1.0270(2)  .093
C17 1  .2406(2) -0.2337(2) 1.0230(2)  .0735(7)
H17 1  .2322(2) -0.3093(2) 1.0553(2)  .088
C18 1  .1666(2) -0.1582(2)  .9918(2)  .0601(6)
H18 1  .1082(2) -0.1843(2) 1.0023(2)  .072
C21 1  .4267(2)  .2841(4)  .6382(2)  .1113(12)
H21A 1  .3873(10)  .277(2)    .5845(5)  .167
H21B 1  .4865(8)  .2517(18)  .6298(13)  .167
H21C 1  .4310(18)  .3746(6)  .6561(9)  .167
C22 1  .4656(2)  .1762(3)  .8202(2)  .0939(9)
H22A 1  .5082(9)  .1067(15)  .8122(7)  .141
H22B 1  .4357(2)  .159(2)    .8713(3)  .141
H22C 1  .4979(11)  .2584(8)  .8271(9)  .141
C23 1  .3494(2)  .0184(3)  .6826(3)  .1102(12)
H23A 1  .4036(4)  -.0250(10)  .6676(17)  .165
H23B 1  .3056(14)  .0244(3)  .6318(10)  .165
H23C 1  .3237(17)  -.0311(9)  .7270(6)  .165
C24 1  .2387(2)  .4599(2)  .8083(2)  .0578(5)
C25 1  .1680(2)  .5706(2)  .7908(2)  .0869(8)
H25A 1  .1821(9)  .6406(10)  .8320(9)  .130
H25B 1  .1080(3)  .5369(6)  .7969(14)  .130
H25C 1  .1698(11)  .6037(15)  .7327(5)  .130
C26 1  .3334(2)  .5205(3)  .8071(2)  .0861(8)
H26A 1  .3792(2)  .4542(6)  .8213(14)  .129
H26B 1  .3413(6)  .5904(14)  .8491(10)  .129
H26C 1  .3394(6)  .5550(19)  .7500(4)  .129
C27 1  .2299(2)  .4011(3)  .8977(2)  .0764(7)
H27A 1  .2758(8)  .3347(13)  .9105(6)  .115
H27B 1  .1703(5)  .3624(17)  .8980(4)  .115
H27C 1  .2379(13)  .4692(4)  .9411(2)  .115