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suggest that this conclusion is rather general.Acknowledgment. Financial support from the National Science Foundation is gratefully acknowledged (CHE 7907588 and PRM 7919451). J.L.J. spent a 1981-82 sabbatical leave from CSULB in the Chemistry Depart-ment, University of California, Irvine, whose kind hospitality and intellectual stimulation were much appreciated.Registry No. PhCH[OCH2C(CH3)3]2, 56377-78-7; PhCH-(OCH2CH3)2, 774-48-1; PhCH(OCH3)2, 1125-88-8; PhCH-(OCH2CH2OCH3)2, 71412-83-4; PhCH(OCH2CH2Cl)2, 59606-97-2; PhCH(OCH2CF3)2, 87088-60-6; PhCH(OCH2CCl3)2, 37150-43-9.

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