Gj. Mcgarvey et al., CIS-1,7,9-TRIOXADISPIRO[5.1.5.3]HEXADECANE AND TRANS-1,7,9-TRIOXADISPIRO[5.1.5.3]HEXADECANE - STABILITY STUDIES AND SOLUTION STRUCTURES, Tetrahedron letters, 37(31), 1996, pp. 5465-5468
The stability of cis- and trans-1,7,9-trioxadispiro[5.1.5.3]hexadecane
s was examined through equilibration studies with the result that the
trans-isomer was more stable by 0.3-0.7 kcal/mol, depending upon the s
olvent. NMR studies indicate that the central ring of these compounds
is in a twist-boat conformation in solution which allows these isomers
to best accommodate conflicting steric and electronic effects on thei
r stability. Copyright (C) 1996 Elsevier Science Ltd