187. Phthalocyanines. Part IX. Derivatives of thiophen, thionaphthen, pyridine, and pyrazine, and a note on the nomenclature
187. Phthalocyanines. Part IX. Derivatives of thiophen, thionaphthen, pyridine, and pyrazine, and a note on the nomenclature
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187. 酞菁。
DOI:
10.1039/jr9370000911
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发表时间:
1937
期刊:
影响因子:
--
通讯作者:
J. Wright
中科院分区:
文献类型:
--
作者:
R. Linstead;E. G. Noble;J. Wright
By RP LINSTEAD, EG NOBLE, and JM WRIGHT. THIS and the three following papers are concerned with investigations of the chemistry of phthalocyanines in two main directions:(1) the possibility of obtaining similar compounds from heterocyclic instead of aromatic intermediates has been examined (Parts IX and X);(2) efforts have been made to bridge the gap between phthalocyanines and porphyrins. The resemblance between these two groups has already been discussed (J., 1934, 1033; Ann. Reports, 1935, 32, 359). The differences between the basic structures are two: phthalocyanine (P) contains four additional fused benzene rings and four linking nitrogen atoms in place of the four methene groups of porphin (Q, X= CH). To connect the two series more closely we have examined the possibility of preparing (a) compounds resembling phthalocyanine with nitrogen links but possessing no fused benzene rings (Part X), and (b) benzporphyrins, Le., analogous compounds with methene links and fused benzene rings (Part XI).This extension of the field has created the need for a more precise nomenclature. The name phthalocyanine is now well established for compounds of the general type indicated by formula (P). It is proposed to use the term porphyraxine for the central ring system of the phthalocyanine molecule, that is, for the structure represented by formula (Q, X= N). Individual compounds are named by attaching an appropriate prefix. Thus the systematic name for phthalocyanine itself on this basis is tetrabenzporphyrazine and the corresponding compound with four pyridine rings in place of four benzenes becomes tetrapyridinoporphyrazine. To avoid undue complication it is not proposed to use the systematic names