G. Doddi et al., REMARKABLE CATALYSIS BY STRONTIUM ION IN S(N)2 AND E2 REACTIONS OCCURRING IN PROXIMITY TO A CROWN-ETHER STRUCTURE, Journal of the Chemical Society, Chemical Communications, (10), 1994, pp. 1239-1240
Strontium ion catalyses the reactions of the crown ether derivatives 1
and 2 with methoxide ion in methanol at 40 degrees C to yield the pro
duct of-substitution 3 and elimination 4, respectively,