Figure 1
The asymmetric units of 1 (top left), 1·HCl (top middle), 3 (top right), 2 (bottom left) and 4 (bottom right), shown with 50% probability displacement ellipsoids. Dotted lines are used to indicate hydrogen-bonding interactions. Only the major disorder component of the ring in 2 is shown. Additional labels for 1·HCl and 2 are included for clarification in later discussion. |