STEREOSELECTIVE ADDITION-REACTIONS OF DIPHENYLPHOSPHINE - MESO-1,2-DIPHENYL-1,2-BIS(DIPHENYLPHOSPHINO)ETHANE AND RAC-1,2-DIPHENYL-1,2-BIS(DIPHENYLPHOSPHINO)ETHANE AND THEIR GROUP-6 METAL TETRACARBONYL COMPLEXES - CRYSTAL-STRUCTURES OF THE MOLYBDENUM DERIVATIVES

被引:27
作者
BOOKHAM, JL
MCFARLANE, W
THORNTONPETT, M
JONES, S
机构
[1] UNIV NEWCASTLE UPON TYNE,DEPT CHEM,NEWCASTLE TYNE NE1 7RU,TYNE & WEAR,ENGLAND
[2] UNIV LEEDS,SCH CHEM,LEEDS LS2 9JT,W YORKSHIRE,ENGLAND
来源
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 1990年 / 12期
关键词
D O I
10.1039/dt9900003621
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The addition of diphenylphosphine, PPh2H, to diphenylethyne in the presence of KOBu(t) has been followed by P-31 n.m.r. spectroscopy, and according to the reaction conditions can yield cis, (2) or trans, (3), 1,2-diphenyl(diphenylphosphino)ethene and then meso, (4), or rac, (5), 1,2-diphenyl-1,2-bis(diphenylphosphino)ethane, all of which have been isolated and characterised by elemental analysis and H-1, C-13, and P-31 n.m.r. spectroscopy. The M(CO)4 (M = Cr, Mo, or W) complexes of (4) and (5) have been prepared, and the structures of the molybdenum derivatives determined by single-crystal X-ray diffraction. In the solid state the chelate rings are puckered with one axial and one equatorial CPh group for the meso diastereomer, and two equatorial for the rac. Carbon-13 n.m.r. data suggest that the latter conformation is not fully maintained in solution.
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页码:3621 / 3627
页数:7
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