In CH2C12 solution the phosphinate anion BrCH2CH2(CH2),CH2(Ph)P(0)Ocyclises only 4.3 times faster when n = 0 (five-membered ring product) than when n = 1; for the thiophosphinate anion CICH2CH2(CH2),CH2(Ph)P(S)Ocyclisation (via sulfur) is still only 30 times faster when n = 0 than when n = 1.
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