In CH2Cl2 solution the phosphinate anion BrCH2CH2(CH2)nCH2(Ph)P(O)O– cyclises only 4,3 times faster when n= 0 (five-membered ring product) than when n= 1; for the thiophosphinate anion ClCH2CH2(CH2)nCH2(Ph)P(S)O– cyclisation (via sulfur) is still only 30 times faster when n= 0 than when n= 1.
在
CH2Cl2溶液中,
磷酸酯阴离子Br (
CH2)n (Ph)P(O)O–在n=0时(生成五元环产物)的环化速率仅比n=1快4.3倍;对于噻
磷酸酯阴离子Cl ( )n (Ph)P(S)O–来说,环化(通过
硫)在n=0时的速率仍然仅比n=1快30倍。