| Chiral Phosphine Ligands Derived from Sugars 4.Crystal Structure of Methyl 4,6-O-Benzylidene-3-Deoxy-3-(Diphenylphosphino)-α-D-Altropyranoside (3-MBPA) |
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| 作者姓名： | SHI Ji- Cheng LIU Qiu-Tian KANG Bei-Sheng |
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| 作者单位： | SHI Ji- Cheng; LIU Qiu-Tian; KANG Bei-Sheng (State Key Laboratory of Structural Chemistry and Fujian Institute of Researchon the Structure of Matter，Chinese Academy of Sciences，Fuzhou 350002 |
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| 摘 要： | IINTRODUCTIONChiralphosphinesareveryusefulligandsinenantioselectivecatalysiswithtransitionmetalcomplexes"'.Becausesugarisrichnotonlyinstereochemistrybutalsoinnatureandpossessesmanyhydroxylgroupsassyntheticstartingpoints,theyhavereceivedmuchattentionsincethe1970st2i.However,thetypesofchiralphosphinesinwhichthephosphorusatomsareattacheddirectlytothesecondarycarbonsofsugararefew.Thedifficultiesinthesyntheticprocessesarepartofthereason.Bythenucleophilicreplacementreaction,itisdifficulttolink…
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| 关 键 词： | chiral phosphine crystal structure α-D-mannopyranoside α-D-altropyranoside |
Chiral Phosphine Ligands Derived from Sugars 4. Crystal Structure of Methyl 4,6-O-Benzylidene-3-Deoxy-3-(Diphenylphosphino)-α-D-Altropyranoside(3-MBPA) |
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| SHI Ji- Cheng, LIU Qiu-Tian, KANG Bei-Sheng.Chiral Phosphine Ligands Derived from Sugars 4. Crystal Structure of Methyl 4,6-O-Benzylidene-3-Deoxy-3-(Diphenylphosphino)-α-D-Altropyranoside(3-MBPA)[J].Chinese Journal of Structural Chemistry,1997(1). |
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| Authors: | SHI Ji- Cheng LIU Qiu-Tian KANG Bei-Sheng |
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| Abstract: | The crystal structure of the title compound 3--MBPA, C26H27O5P (Mr.= 450. 44 ). has been determined by single--crystal X-ray diffraction. The crystal ismonoclinic with space group P21, a= 9. 294(l), b= 7. 999(1), c= 15. 925(2) A,β=96. 17(5)°, V= 1176. 9 A 3, Dc=l. 271 g/cm3, F(000)=476, μ=12. 99 cm-1,Z=', Z=2, and final R = 0. 045 and Ru= 0. 057 for 1882 reflections (I≥3a(I) ). Structureanalysis revealed that the pyranose and 4, 6--O--benzylidene ring of the title compoundadopt a distorted chair conformation and the diphenylphosphino, OH and OMe groupsare in pseudo--axial position. |
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| Keywords: | chiral phosphine crystal structure α-D-mannopyranoside α-D-altropyranoside |
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