Acknowledgment. We thank the National Science Foundation for a grant (No. CHE-78-04805) in support of this work. ... Registry No. 3, 83542-55-6; 4, 5369-22-2; 5, 76302-58-4; 6, 83527-88-2; 7,83527-87-1; 8,83527-89-3; 9,83527-90-6; 10,83527-91-7; 11, 83527-92-8; 12, 22161-41-7; 13, 83527-93-9; 14, 83527-95-1; 15, 83527-94-0; 16, 21408-16-2; 17,83527-98-4; 18 (isomer l), 83527-99-5; 18 (isomer 2), 83527-00-1; 19, ...