Macrocycles containing tin. Syntheses of symmetrical macrocycles containing two or four diphenylstanna units

~62%

~56%

~%

~%

~75%

~26%

~43%

~0%

~60%

~%

~56%

~19%

~25%

~25%

~58%

~18%

~45%

~0%

~23%

~25%