Synthesis of silicon tetrapyrazinoporphyrazines

Symmetric, peripherally substituted dihydroxysilicon tetrapyrazinoporphyraz ines 5 and 6 were synthesized by reacting the diiminoisoindolines 1 and 2 w ith SiCl4 in pyridine as solvent at considerably low temperature followed b y hydrolysis of the intermediate dichlorosilicon tetrapyrazinoporphyrazines 3 and 4. In addition, the preparation of the bisaxially substituted trialk ylsilyloxysilicon tetrapyrazinoporphyrazines 11 and 12, the corresponding t rialkylsilyloxyhydroxy compound 14 and the mu-oxo dimer 15 is also reported . Copyright (C) 2000 John Wiley & Sons, Ltd.