Macrocyclic polyamines: 1,4,7,10,13,16‐hexaäzacycloöctadecane intermediate: N,N′,N″‐ Tris (p‐ tolylsulfonyl ) diethylenetriamine (1) intermediate: N,N′,N″‐ Tris (p‐ tolysulfonyl ) diethylenetriamine ‐N,N″‐ disodium salt (2) intermediate: 3,6,9‐ Tris (p‐ tolylsulfonyl )‐3,6,9‐ triazaundecane ‐1,11‐ diol (3) intermediate: 3,6,9‐ Tris (p‐ tolylsulfonyl )‐3,6,9‐ triazaundecane ‐1,11‐ dimethanesulfonate (4) intermediate: 1,4,7,10,13,16‐ Hexakis (p‐ tolylsulfonyl )‐1,4,7,10,13,16‐ hexaäzacycloöctadecane (5) product: 1,4,7,10,13,16‐hexaäzacycloöctadecane (6)

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The photolysis of 6,7,8,9-tetrahydro-B-hydroxy-?-0~0-5,8-methano-5H-benzocycloheptene -10carboxylic acid lactone yields, in addition to CO,, naphthalene, keten, 3,4-benzotricyclo [3,3,0,021*]octan-7-one, and benzobicyclo [2,2,2]octadienone, the same products obtained from the sensitized photolysis of benzobicyclo[2,2,2] octadienone.* A similar study has been carried out on a methylated analogue in which the bridgehead positions were unlabelled (H. Hart and R. K.